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        1. SI9136_11 [VISHAY]

          Multi-Output Power-Supply Controller; 多路輸出電源控制器
          SI9136_11
          型號: SI9136_11
          廠家: VISHAY    VISHAY
          描述:

          Multi-Output Power-Supply Controller
          多路輸出電源控制器

          控制器
          文件: 總16頁 (文件大?。?59K)
          中文:  中文翻譯
          下載:  下載PDF數據表文檔文件
          Not recommended for new designs, please refer to Si9138  
          Si9136  
          Vishay Siliconix  
          Multi-Output Power-Supply Controller  
          DESCRIPTION  
          FEATURES  
          ?
          ?
          ?
          ?
          ?
          ?
          ?
          ?
          Up to 95 % Efficiency  
          The Si9136 is a current-mode PWM and PSM converter  
          controller, with two synchronous buck converters (3.3 V and  
          5 V) and a flyback (non-isolated buck-boost) converter  
          (12 V). Designed for portable devices, it offers a total five  
          power outputs (three tightly regulated dc/dc converter  
          outputs, a precision 3.3 V reference and a 5 V LDO output).  
          It requires minimum external components and is capable of  
          achieving conversion efficiencies approaching 95 %.  
          The Si9136 is available in a 28-pin SSOP package and  
          specified to operate over the extended commercial (0 °C to  
          90 °C) temperature range.  
          3 % Total Regulation (Each Controller)  
          5.5 V to 30 V Input Voltage Range  
          3.3 V, 5 V, and 12 V Outputs  
          200 kHz Low-Noise Fixed Frequency Operation  
          Precision 3.3 V Reference Output  
          30 mA Linear Regulator Output  
          High Efficiency Pulse Skipping Mode Operation at  
          Light Load  
          ?
          ?
          ?
          ?
          ?
          Only Three Inductors Required - No Transformer  
          LITTLE FOOT? Optimized Output Drivers  
          Internal Soft-Start  
          Minimal External Control Components  
          28-Pin SSOP Package  
          FUNCTIONAL BLOCK DIAGRAM  
          V
          IN  
          5 V  
          Linear  
          Regulator  
          3.3 V  
          Voltage  
          Reference  
          V
          REF  
          (+ 3.3 V)  
          V
          L
          (5.0 V)  
          3.3 V  
          SMPS  
          5 V  
          SMPS  
          + 3.3 V  
          + 5 V  
          + 12 V  
          12 V SMPS  
          Control  
          Inputs  
          Power-Up Control  
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          www.vishay.com  
          1
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          ABSOLUTE MAXIMUM RATINGS  
          Parameter  
          Limit  
          - 0.3 to + 36 V  
          2
          Unit  
          V
          IN to GND  
          PGND to GND  
          V
          VL to GND  
          - 0.3 to + 6.5 V  
          - 0.3 V to + 36 V  
          Continuous  
          BST3, BST5, BSTFY to GND  
          VL Short to GND  
          LX3 to BST3; LX5 to BST5; LXFY to BST  
          Inputs/Outputs to GND (CS3, CS5, CSP, CSN)  
          5 ON/OFF, 3 ON/OFF, 12 ON/OFF  
          DL3, DL5 to PGND  
          - 6.5 V to 0.3 V  
          - 0.3 V to (VL + 0.3 V)  
          - 0.3 V to + 5.5 V  
          - 0.3 V to (VL + 0.3 V)  
          Input of Flyback  
          - 0.3 V to (BSTX + 0.3 V)  
          572  
          V
          DLFY to PGND  
          DH3 to LX3, DH5 to LX5, DHFY to LXFY  
          Continuous Power Dissipation (TA = 90 °C)a  
          Operating Temperature Range  
          V
          28-Pin SSOPb  
          mW  
          0 °C to 90 °C  
          - 40 °C to 125 °C  
          300  
          °C  
          Storage Temperature Range  
          Lead Temperature (Soldering, 10 Sec.)  
          Notes:  
          a. Device Mounted with all leads soldered or welded to PC board.  
          b. Derate 9.25 mW/°C above 90 °C.  
          Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation  
          of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum  
          rating conditions for extended periods may affect device reliability.  
          SPECIFICATIONS  
          Specific Test Conditions  
          Limits  
          Typ.b  
          V
          IN = 15 V , IVL = IREF = 0 mA  
          Parameter  
          Unit  
          Min.a  
          Max.a  
          TA = 0 °C to 90 °C, All Converters ON  
          3.3 V Buck Controller  
          Total Regulation (Line, Load, and Temperature)  
          Line Regulation  
          V
          V
          IN = 6 to 30 V, 0 < VCS3 - VFB3 < 90 mV  
          3.23  
          3.33  
          3.43  
          0.5  
          V
          V
          IN = 6 to 30 V  
          0 < VCS3 - VFB3 < 90 mV  
          CS3 - VFB3  
          L = 10 μH, C = 330 μF  
          SENSE = 20 m?  
          %
          Load Regulation  
          0.5  
          Current Limit  
          V
          90  
          125  
          50  
          160  
          mV  
          kHz  
          °
          Bandwidth  
          Phase Margin  
          R
          65  
          5 V Buck Controller  
          Total Regulation (Line, Load, and Temperature)  
          Line Regulation  
          IN = 6 to 30 V, 0 < VCS5 - VFB5 < 90 mV  
          IN = 6 to 30 V  
          0 < VCS5 - VFB5 < 90 mV  
          CS5 - VFB5  
          L = 10 μH, C = 330 μF  
          SENSE = 20 m?  
          4.88  
          90  
          5.03  
          5.18  
          0.5  
          V
          V
          %
          Load Regulation  
          0.5  
          Current Limit  
          V
          125  
          50  
          160  
          mV  
          kHz  
          °
          Bandwidth  
          Phase Margin  
          R
          65  
          12 V Flyback Controller  
          Total Regulation (Line, Load, and Temperature)  
          Line Regulation  
          V
          IN = 6 to 30 V, 0 < VCSP - VCSN < 300 mV  
          IN = 6 to 30 V  
          0 < VCSP - VFBN < 300 mV  
          CSP - VCSN  
          11.4  
          330  
          12.0  
          12.6  
          0.5  
          V
          V
          %
          Load Regulation  
          0.5  
          Current Limit  
          V
          410  
          10  
          500  
          mV  
          kHz  
          °
          Bandwidth  
          L = 10 μH, C = 100 μF  
          Phase Margin  
          R
          SENSE = 100 m?, Ccomp = 120 pF  
          65  
          Internal Regulator  
          VL Output  
          All Converters OFF, VIN > 5.5, 0 < IL < 30 mA  
          4.7  
          3.6  
          5.5  
          4.2  
          V
          VL Fault Lockout Voltage  
          VL Fault Lockout Hysteresis  
          VL /FB5 Switchover Voltage  
          VL /FB5 Switchover Hysteresis  
          75  
          75  
          mV  
          V
          4.2  
          4.7  
          mV  
          www.vishay.com  
          2
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          SPECIFICATIONS  
          Specific Test Conditions  
          Limits  
          Unit  
          V
          IN = 15 V , IVL = IREF = 0 mA  
          Parameter  
          Min.a  
          Typ.b  
          Max.a  
          TA = 0 °C to 90 °C, All Converters ON  
          Reference  
          REF Output  
          No External Load  
          0 to 1 mA  
          3.24  
          3.30  
          30  
          3.36  
          75  
          V
          REF Load Regulation  
          Supply Current  
          mV  
          Supply Current-Shutdown  
          Supply Current-Operation  
          Oscillator  
          All Converters OFF, No Load  
          35  
          60  
          μA  
          All Converters ON, No Load, FOCS = 200 kHz  
          1100  
          1800  
          Oscillator Frequency  
          180  
          92  
          200  
          95  
          220  
          kHz  
          %
          Maximum Duty Cycle  
          Outputs  
          Gate Driver Sink/Source Current (Buck)  
          Gate Driver On-Resistance (Buck)  
          Gate Driver Sink/Source Current (Flyback)  
          Gate Driver On-Resistance (Flyback)  
          5 ON/OFF, 3 ON/OFF, and 12 ON/OFF  
          VIL  
          DL3, DH3, DL5, DH5 Forced to 2 V  
          High or Low  
          1
          2
          A
          ?
          A
          ?
          7
          DHFY, DLFY Forced to 2 V  
          High or Low  
          0.2  
          15  
          0.8  
          V
          VIH  
          2.4  
          Notes:  
          a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum.  
          b. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.  
          PIN CONFIGURATION  
          SSOP-28  
          ORDERING DESCRIPTION  
          VOUT  
          Part Number  
          Temperature Range  
          1
          2
          28  
          27  
          26  
          25  
          24  
          23  
          22  
          21  
          20  
          19  
          18  
          17  
          16  
          15  
          Si9136LG  
          0 °C to 90 °C  
          3.3 V, 5 V, 12 V  
          3
          Evaluation Board  
          Temperature Range  
          Board Type  
          4
          Si9136DB  
          0 °C to 90 °C  
          Surface Mount  
          5
          6
          7
          8
          9
          10  
          11  
          12  
          12  
          14  
          Top View  
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          www.vishay.com  
          3
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          PIN DESCRIPTION  
          Pin Number  
          Symbol  
          Description  
          CS3  
          1
          Current sense input for 3.3 V buck.  
          2
          FBFY  
          BSTFY  
          DHFY  
          LXFY  
          DLFY  
          CSP  
          Feedback for flyback.  
          3
          Boost capacitor connection for flyback converter.  
          Gate-drive output for flyback high-side MOSFET.  
          Inductor connection for flyback converter.  
          Gate-drive output for flyback low-side MOSFET.  
          Current sense positive input for flyback converter.  
          4
          5
          6
          7
          8
          CSN  
          Current sense negative input for flyback converter.  
          Analog ground.  
          9
          GND  
          10  
          11  
          12  
          13  
          14  
          15  
          16  
          17  
          COMP  
          REF  
          Flyback compensation connection, if required.  
          3.3 V internal reference.  
          12 ON/OFF ON and OFF control input for 12 V flyback controller.  
          3.3 ON/OFF ON and OFF control input for 3.3 V buck controller.  
          5 ON/OFF ON and OFF control input for 5 V buck controller.  
          CS5  
          Current sense input for 5 V buck controller.  
          Inductor connection for buck 5 V.  
          DH5  
          LX5  
          Gate-drive output for 5 V buck high-side MOSFET.  
          BST5  
          18  
          19  
          20  
          21  
          Boost capacitor connection for 5 V buck converter.  
          Gate-drive output for 5 V buck low-side MOSFET.  
          Power ground.  
          DL5  
          PGND  
          FB5  
          Feedback for 5 V buck.  
          VL  
          22  
          23  
          24  
          25  
          26  
          27  
          28  
          5 V logic supply voltage for internal circuitry.  
          Input voltage  
          VIN  
          DL3  
          Gate-drive output for 3.3 V buck low-side MOSFET.  
          Boost capacitor connection for 3.3 V buck converter.  
          Inductor connection for 3.3 V buck low-side MOSFET.  
          Gate-drive output for 3.3 V buck high-side MOSFET.  
          Feedback for 3.3 V buck.  
          BST3  
          LX3  
          DH3  
          FB3  
          www.vishay.com  
          4
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted)  
          100  
          100  
          90  
          Frequency = 200 kHz  
          = 6 V  
          Frequency = 200 kHz  
          90  
          V
          IN  
          V
          IN  
          = 6 V  
          15 V  
          15 V  
          80  
          70  
          60  
          80  
          70  
          60  
          30 V  
          30 V  
          5 V On, 12 V Off  
          3.3 V Off, 12 V Off  
          50  
          50  
          0.001  
          0.01  
          0.1  
          1
          10  
          0.001  
          0.01  
          0.1  
          Current (A)  
          Efficiency vs. 5.0 V Output Current  
          1
          10  
          Current (A)  
          Efficiency vs. 3.3 V Output Current  
          85  
          V
          IN  
          = 15 V  
          Frequency = 200 kHz  
          80  
          75  
          70  
          65  
          6 V  
          30 V  
          5 V On, 3.3 V Off  
          60  
          55  
          0.001  
          0.01  
          Current (A)  
          Efficiency vs. 12 V Output Current  
          0.1  
          1
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          www.vishay.com  
          5
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          TYPICAL WAVEFORMS  
          Ch1: V  
          OUT  
          Ch1: V  
          OUT  
          Ch2: Load  
          Current (1 A/div)  
          Ch2: Load  
          Current (1 A/div)  
          PWM Unloading  
          PWM Loading  
          5 V Converter (VIN = 10 V)  
          5 V Converter (VIN = 10 V)  
          Ch1: V  
          OUT  
          Ch1: V  
          OUT  
          Ch2: Load  
          Current (1 A/div)  
          Ch2: Load  
          Current (1 A/div)  
          ?
          PSM PWM  
          PWM ? PSM  
          5 V Converter (VIN = 10 V)  
          5 V Converter (VIN = 10 V)  
          Ch2: V  
          OUT  
          Ch2: V  
          OUT  
          Ch3: Inductor  
          Node  
          (L X5)  
          Ch3: Inductor  
          Node  
          (L X5)  
          Ch4: Inductor  
          Current (1A/div)  
          Ch4: Inductor  
          Current (1A/div)  
          PWM Operation  
          PSM Operation  
          5 V Converter (VIN = 10 V)  
          5 V Converter (VIN = 10 V)  
          www.vishay.com  
          6
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          TYPICAL WAVEFORMS  
          Ch1: V  
          Ch1: V  
          OUT  
          OUT  
          Ch2: Load  
          Current (1 A/div)  
          Ch2: Load  
          Current (1 A/div)  
          PWM, Loading  
          PWM, Unloading  
          3 V Converter (VIN = 10 V)  
          3 V Converter (VIN = 10 V)  
          Ch1:  
          Ch1:  
          V
          OUT  
          V
          OUT  
          Ch2: Load  
          Current (1 A/div)  
          Ch2: Load  
          Current (1 A/div)  
          PWM ? PSM  
          PSM ? PWM  
          3 V Converter (VIN = 10 V)  
          3 V Converter (VIN = 10 V)  
          3.3 V Output  
          5 V Output  
          Ch1: V  
          OUT  
          12 V Output  
          Inductor Current,  
          5 V Converter  
          (2 A/div)  
          Ch4: Load  
          Current  
          (100 mA/div)  
          250 mA Transient  
          12 V Converter (VIN = 10 V)  
          Start-Up  
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          www.vishay.com  
          7
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          STANDARD APPLICATION CIRCUIT  
          V
          IN  
          + 5 V up to 30 mA  
          C7  
          33 μF  
          D1  
          CMPD2836  
          D2  
          CMPD2836  
          C5  
          4.7 μF  
          C4  
          33 μF  
          V
          IN  
          V
          L
          C1  
          0.1 μF  
          C2  
          0.1 μF  
          BST  
          BST  
          3
          5
          Q2  
          Si4416DY  
          L1, 10 μH  
          R
          7
          DH5  
          LX  
          R
          cs1  
          Q1  
          Si4416DY  
          0.02 Ω  
          + 5 V  
          DH3  
          LX  
          5
          C3  
          330 μF  
          3
          Q4  
          Si4812DY  
          R
          1
          L2  
          10 μH  
          R
          cs2  
          DL5  
          0.02 Ω  
          + 3.3 V  
          Q3  
          Si4812DY  
          DL3  
          CS  
          FB  
          5
          C6  
          330 μF  
          5
          D3  
          CMPD2836  
          C8  
          CS  
          3
          C9  
          4.7 μF  
          BSTFY  
          0.1 μF  
          Q5  
          DHFY  
          LXFY  
          Si2304DS  
          + 12 V 0 to  
          250 mA  
          L3, 10 μH  
          D4, D1FS4  
          C10  
          100 μF  
          D5, D1FS4  
          FB3  
          Q6  
          Si2304DS  
          DLFY  
          CSP  
          5 ON/OFF  
          R
          R
          6
          cs3  
          3.3 ON/OFF  
          12 ON/OFF  
          CSN  
          FBFY  
          + 3.3 V up  
          to 1 mA  
          REF  
          COMP  
          PGND  
          GND  
          C11  
          1 μF  
          C12  
          120 pF  
          Figure 1.  
          www.vishay.com  
          8
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          TIMING DIAGRAMS  
          The converter is enabled  
          ON/OFF  
          V
          IN  
          is applied  
          V
          IN  
          LDO is activated  
          after V is applied  
          IN  
          V
          L
          REF circuit is activated  
          after V becomes  
          available  
          2.4 V  
          L
          V
          REF  
          After V  
          goes above  
          REF  
          2.4 V, the converter is  
          turned on  
          OSC EN  
          (Sysmon EN)  
          Oscillator is activated  
          OSC  
          Slow soft-start gradually  
          increases the maximum  
          inductor current  
          4 ms  
          f
          (SS)  
          DH  
          max  
          High-side gate drive duty  
          ratio gradually increases  
          to maximum  
          t
          BBM  
          Low-side gate drive  
          D
          L
          Figure 2. Converter is Enabled Before VIN is Applied  
          The converter is  
          enabled  
          ON/OFF  
          V
          IN  
          is applied  
          V
          IN  
          LDO is activated  
          after V is applied  
          IN  
          V
          L
          REF circuit is activated  
          after V becomes  
          available  
          L
          2.4 V  
          V
          REF  
          After V  
          goes above  
          REF  
          2.4 V, the converter is  
          turned on  
          OSC EN  
          (Sysmon EN)  
          Oscillator is activated  
          OSC  
          4 ms  
          Slow soft-start gradually  
          increases the maximum  
          inductor current  
          f
          (SS)  
          DH  
          DL  
          max  
          Figure 3. Converter is Enabled After VIN is Applied  
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          www.vishay.com  
          9
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          TIMING DIAGRAMS  
          V
          IN  
          V (V )  
          L
          V
          L
          4 V  
          3.4 V  
          RESET  
          V
          REF  
          OSC EN  
          (Sysmon EN)  
          OSC  
          D
          H
          D
          L
          f
          (SS)  
          max  
          Figure 4. Power Off Sequence  
          www.vishay.com  
          10  
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          DETAIL FUNCTIONAL BLOCK DIAGRAM  
          FB  
          5
          CS_  
          FB_  
          +
          -
          1X  
          R
          R
          X
          Internal voltage  
          divider is only  
          used on 5 V  
          output.  
          Error  
          Amplifier  
          Y
          -
          5/3 ON/OFF_  
          BST_  
          PWMCMP  
          +
          REF  
          -
          DH  
          DH  
          +
          Logic  
          Control  
          Pulse  
          Skipping  
          Control  
          LX_  
          SLC  
          BBM  
          DL  
          20 mV  
          V
          L
          Current  
          Limit  
          DL  
          V
          Soft-Start  
          SYNC  
          Rectifier Control  
          t
          Figure 5. Buck Block Diagram  
          FBFY  
          R1  
          R2  
          ON/OFF  
          Error  
          Amplifier  
          PWM  
          Comparator  
          BSTY  
          -
          -
          Logic  
          Control  
          DH  
          REF  
          +
          +
          LXFY  
          COMP  
          DHFY  
          DLFY  
          C/S  
          Amplifier  
          Pulse  
          Skipping  
          Control  
          DL  
          ICSP  
          ICSN  
          -
          +
          -
          100 mV  
          +
          Current Limit  
          V
          Soft-Start  
          t
          Figure 6. PWM Flyback Block Diagram  
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          www.vishay.com  
          11  
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          DETAIL FUNCTIONAL BLOCK DIAGRAM  
          5 V  
          Linear  
          Regulator  
          V
          IN  
          FB  
          5
          CS  
          5
          5 V  
          Buck  
          BST  
          5
          5 ON/OFF  
          3 ON/OFF  
          12 ON/OFF  
          Controller  
          DH5  
          LX  
          5
          V
          L
          4.5 V  
          DL5  
          4 V  
          FB  
          3
          CS  
          3
          Logic  
          3.3 V  
          Buck  
          Controller  
          Control  
          BST  
          3.3 V  
          3
          Reference  
          DH3  
          LX  
          2.4 V  
          3
          DL3  
          FYBFY  
          ICSP  
          12 V  
          Flyback  
          Controller  
          ICSN  
          BSTFY  
          DHFY  
          LXFY  
          DLFY  
          Figure 7. Complete Si9136 Block Diagram  
          DESCRIPTION OF OPERATION  
          Start-up Sequence  
          Switch-mode supply output current capabilities depend on  
          external components (can be selected to exceed 10 A). In  
          the standard application circuit illustrated in Figure 1, each  
          buck converter is capable of delivering 5 A, with the flyback  
          converter delivering 250 mA. The recommended load  
          currents for the precision 3.3 V reference output is less than  
          1 mA, and the 5 V LDO output is less than 30 mA. In order to  
          maximize power efficiency of the converter, when the 5 V  
          buck converter output (FB5) voltage is above 4.5 V, the  
          internal 5 V LDO is turned off and VL is supplied by the 5 V  
          converter output.  
          Si9136’s outputs are controlled by three specific input control  
          lines; 3.3 ON/OFF, 5 ON/OFF, and 12 ON/OFF. Once VIN is  
          applied, the VL, the 5 V LDO will come up within its tolerance.  
          When any one of these control lines becomes logic high, the  
          precision 3.3 V reference will also come up. Immediately  
          afterwards, the oscillator will begin and the corresponding  
          converter will come up with its own tolerance. In the event of  
          all three converters are turned off, the oscillator and the  
          reference output will be turned off, and the total system will  
          only draw 35 μA of supply current.  
          Buck Converter Operation:  
          Each converter can soft-start independently. This internal  
          soft-start circuitry for each converter will gradually increases  
          the inductor maximum peak current during the soft-start  
          period (approximately 4 ms), preventing excessive currents  
          from being drawn from the input.  
          The 3.3 V and 5 V buck converters are both current-mode  
          PWM and PSM (during light load operation) regulators using  
          high-side bootstrap N-Channel and low-side N-Channel  
          MOSFETs. At light load conditions, the converters switch at  
          a lower frequency than the clock frequency, seen like some  
          clock pulses between the actual switching are skipped, this  
          operating condition is defined as pulse-skipping. The  
          operation of the converter(s) switching at clock frequency is  
          defined as normal operation.  
          Si9136 converts a 5.5 V to 30 V input voltage to five different  
          output voltages; two buck (step-down) high current, PWM,  
          switch-mode supplies of 3.3 V and 5 V, one "flyback" PWM  
          switch-mode supply of 12 V, one precision 3.3 V reference  
          and one 5 V low drop out (LDO) linear regulator output.  
          www.vishay.com  
          12  
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          DESCRIPTION OF OPERATION (CONT’D)  
          Normal Operation: Buck Converters  
          It consists of two N-Channel MOSFET switches that are  
          turned on and off in phase, and two diodes. Similar to the  
          buck converter, during the light load conditions, the flyback  
          converter will switch at a frequency lower than the internal  
          clock frequency, which can be defined as pulse skipping  
          mode (PSM); otherwise, it is operating in normal PWM mode.  
          In normal operation, the buck converter high-side MOSFET  
          is turned on with a delay (known as break-before-make time  
          - tBBM), after the rising edge of the clock. After a certain on  
          time, the high-side MOSFET is turned off and then after a  
          delay (tBBM), the low-side MOSFET is turned on until the next  
          rising edge of the clock, or the inductor current reaches zero.  
          The tBBM (approximately 25 ns to 60 ns), has been optimized  
          to guarantee the efficiency is not adversely affected at the  
          high switching frequency and a specified minimum to  
          account for variations of possible MOSFET gate  
          capacitances.  
          Normal Operation: Flyback Converter  
          In normal operation mode, the two MOSFETs are turned on  
          at the rising edge of the clock, and then turned off. The on  
          time is controlled internally to provide excellent load, line,  
          and temperature regulation. The flyback converter has load,  
          line and temperature regulation well within 0.5 %.  
          During the normal operation, the high-side MOSFET switch  
          on-time is controlled internally to provide excellent line and  
          load regulation over temperature. Both buck converters  
          should have load, line, regulation to within 0.5 % tolerance.  
          Pulse Skipping: Flyback Converter  
          Under the light load conditions, similar to the buck converter,  
          the flyback converter will enter pulse skipping mode. The  
          MOSFETs will be turned on until the inductor current  
          increases to such a level that the voltage across the pin CSP  
          and pin CSN reaches 100 mV, or the on time reaches the  
          maximum duty cycle. After the MOSFETs are turned off, the  
          inductor current will conduct through two diodes until it  
          reaches zero. At this point, the flyback converter output will  
          rise slightly above the regulation level, and the converter will  
          stay idle for one or several clock cycle(s) until the output falls  
          back slightly below the regulation level. The switching losses  
          are reduced by skipping pulses and so the efficiency during  
          light load is preserved.  
          Pulse Skipping: Buck Converters  
          When the buck converter switching frequency is less than  
          the internal clock frequency, its operation mode is defined as  
          pulse skipping mode. During this mode, the high-side  
          MOSFET is turned on until VCS-VFB reaches 20 mV, or the  
          on time reaches its maximum duty ratio. After the high-side  
          MOSFET is turned off, the low-side MOSFET is turned on  
          after the tBBM delay, which will remain on until the inductor  
          current reaches zero. The output voltage will rise slightly  
          above the regulation voltage after this sequence, causing the  
          controller to stay idle for the next one, or several clock cycles.  
          When the output voltage falls slightly below the regulation  
          level, the high-side MOSFET will be turned on again at the  
          next clock cycle. With the converter remaining idle during  
          some clock cycles, the switching losses are reduced in order  
          to preserve conversion efficiency during the light output  
          current condition.  
          Current Limit: Flyback Converter  
          Similar to the buck converter; when the voltage across pin  
          CSP and pin CSN exceeds 410 mV typical, the two  
          MOSFETs will be turned off regardless of the input and  
          output conditions.  
          Current Limit: Buck Converters  
          Flyback Lowside Drive  
          When the buck converter inductor current is too high, the  
          voltage across pin CS3(5) and pin FB3(5) exceeds  
          approximately 120 mV, the high-side MOSFET would be  
          turned off instantaneously regardless of the input, or output  
          condition. The Si9136 features clock cycle by clock cycle  
          current limiting capability.  
          Unlike the gate drive for the two buck converters, the flyback  
          lowside gate drive DLFY is powered by a voltage that can be  
          as high as 15 V with 20 V input for the flyback converter. If  
          this poses concerns on the MOSFET VGS rating, a simple  
          resistor-zener circuit can be used: a resistor series with gate  
          and zener diode across the gate and source to clamp its  
          voltage. A 100 ?, 10 V combination works well.  
          Flyback Converter Operation:  
          Designed mainly for PCMCIA or EEPROM programming, the  
          Si9136 has a 12 V output non-isolated buck boost converter,  
          called for brevity a flyback.  
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          www.vishay.com  
          13  
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Si9136  
          Vishay Siliconix  
          DESCRIPTION OF OPERATION (CONT’D)  
          Grounding:  
          efficiency. The converters are current mode control, with a  
          bandwidth substantially higher than the LC tank dominant  
          pole frequency of the output filter. To ensure stability, the  
          minimum capacitance and maximum ESR values are:  
          There are two separate grounds on the Si9136, analog  
          signal ground (GND) and power ground (PGND). The  
          purpose of two separate grounds is to prevent the high  
          currents on the power devices (both external and internal)  
          from interfering with the analog signals. The internal  
          components of Si9136 have their grounds tied (internally)  
          together. These two grounds are then tied together  
          (externally) at a single point, to ensure Si9136 noise  
          immunity.  
          VREF  
          VOUT x Rcs  
          CLOAD  
          ESR  
          2π x  
          x RCS x BW  
          VOUT  
          VREF  
          Where VREF  
          = 3.3 V, VOUT is the output voltage  
          This separation of grounds should be maintained in the  
          external circuitry, with the power ground of all power devices  
          being returned directly to the input capacitors, and the small  
          signal ground being returned to the GND pin of Si9136.  
          (5 V or 3.3 V), Rcs is the current sensing resistor in ohms  
          and BW = 50 khz  
          With the components specified in the application circuit  
          (L = 10 μH, RCS = 0.02 ?, COUT = 330 μF, ESR  
          approximately 0.1 ?, the converter should have a bandwidth  
          at approximately 50 kHz, with minimum phase margin of 65°,  
          and dc gain above 50 dB.  
          ON/OFF Function  
          Logic-low shuts off the appropriate section by disabling the  
          gate drive stage. High-side and low-side gate drivers are  
          turned off when ON/OFF pins are logic-low. Logic-high  
          enables the DH and DL pins.  
          Other Outputs  
          The Si9136 also provides a 3.3 V reference which can be  
          external loaded up to 1 mA, as well as, a 5 V LDO output  
          which can be loaded 30 mA, or even more depending on the  
          system application. When the 5 V buck converter is turned  
          on, the 5 V LDO output is shorted with the 5 V buck converter  
          output, so its loading capability is substantially increased.  
          For stability, the 3.3 V reference output requires a 1 μF  
          capacitor, and 5 V LDO output requires a 4.7 μF capacitor.  
          Stability:  
          Buck Converters:  
          In order to simplify designs, the Si9136 requires no specified  
          external components except load capacitors for stability  
          control. Meanwhile, it achieves excellent regulation and  
          Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon  
          Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and  
          reliability data, see www.vishay.com/ppg?70818.  
          www.vishay.com  
          14  
          Document Number: 70818  
          S11-0975-Rev. D, 16-May-11  
          This document is subject to change without notice.  
          THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
          Package Information  
          Vishay Siliconix  
          SSOP: 28-LEAD (5.3 MM) (POWER IC ONLY)  
          28  
          15  
          ?B?  
          E
          1
          E
          1
          14  
          ?A?  
          D
          e
          GAUGE PLANE  
          R
          c
          A
          2
          A
          1
          A
          ?C?  
          L
          SEATING PLANE  
          ?
          SEATING PLANE  
          0.076  
          C
          L
          1
          b
          S
          M
          0.12  
          A
          B
          C
          MILLIMETERS  
          Dim  
          A
          A1  
          A2  
          b
          c
          D
          E
          E1  
          e
          Min  
          Nom  
          1.88  
          Max  
          1.99  
          0.21  
          1.78  
          0.38  
          0.20  
          10.33  
          8.00  
          5.40  
          1.73  
          0.05  
          1.68  
          0.25  
          0.09  
          10.07  
          7.60  
          5.20  
          0.13  
          1.75  
          0.30  
          0.15  
          10.20  
          7.80  
          5.30  
          0.65 BSC  
          0.75  
          0.63  
          0.95  
          L
          1.25 BSC  
          0.15  
          L1  
          R
          0.09  
          ? ? ?  
          0_  
          4_  
          8_  
          ?
          ECN: S-40080—Rev. A, 02-Feb-04  
          DWG: 5915  
          Document Number: 72810  
          28-Jan-04  
          www.vishay.com  
          1
          Legal Disclaimer Notice  
          Vishay  
          Disclaimer  
          ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE  
          RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.  
          Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively,  
          “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other  
          disclosure relating to any product.  
          Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or  
          the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all  
          liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,  
          consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular  
          purpose, non-infringement and merchantability.  
          Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of typical  
          requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements  
          about the suitability of products for a particular application. It is the customer’s responsibility to validate that a particular  
          product with the properties described in the product specification is suitable for use in a particular application. Parameters  
          provided in datasheets and/or specifications may vary in different applications and performance may vary over time. All  
          operating parameters, including typical parameters, must be validated for each customer application by the customer’s  
          technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,  
          including but not limited to the warranty expressed therein.  
          Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining  
          applications or for any other application in which the failure of the Vishay product could result in personal injury or death.  
          Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk and agree  
          to fully indemnify and hold Vishay and its distributors harmless from and against any and all claims, liabilities, expenses and  
          damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that Vishay  
          or its distributor was negligent regarding the design or manufacture of the part. Please contact authorized Vishay personnel to  
          obtain written terms and conditions regarding products designed for such applications.  
          No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by  
          any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners.  
          Document Number: 91000  
          Revision: 11-Mar-11  
          www.vishay.com  
          1

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