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SI786CSG Datasheet(PDF) 7 Page - Vishay Siliconix |
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SI786CSG Datasheet(HTML) 7 Page - Vishay Siliconix |
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7 / 14 page  Si786 Vishay Siliconix Document Number: 70189 S-40807—Rev. J, 26-Apr-04 www.vishay.com 7 PIN DESCRIPTION AND ORDERING INFORMATION CS3 FB3 SS3 SSOP-28 DH3 ON3 LX3 D1 BST3 D2 VH Q2 DL3 V+ VL Top View 25 26 27 28 2 3 4 1 22 23 24 5 6 7 Q1 FB5 GND PGND REF DL5 SYNC BST5 SHDN ON5 SS5 LX5 DH5 CS5 18 19 20 21 9 10 11 8 15 16 17 12 13 14 PIN DESCRIPTION Pin Symbol Description 1 CS3 Current-sense input for 3.3-V Buck controller—this pins over current threshold is 100 mV with respect to FB3. 2 SS3 Soft-start input for 3.3 V. Connect capacitor from SS3 to GND. 3 ON3 ON/OFF logic input disables the 3.3-V Buck controller. Connect directly to VL for automatic turn-on. 4 D1 Comparator #1 noninverting input, threshold = 1.650 V. Comparator #1 output = Q1. Connect to GND if unused. 5 D2 Comparator #2 noninverting input (see D1). 6 VH External bias supply-voltage input for comparators #1 and #2. 7 Q2 Comparator #2 output. Sources 20 mA from VH when D2 is high. Sinks 500 mA to GND when D2 is low regardless of VH input voltage. 8 Q1 Comparator #1 output (see Q2). 9 GND Analog ground. 10 REF 3.3-V reference output. Supplies external loads up to 5 mA. 11 SYNC Oscillator control/synchronization input. Connect capacitor to GND, 1-mF/mA output or 0.22 mF minimum. For external clock synchronization, a rising edge starts a new cycle to start. To use internal 200-kHz oscillator, connect to VL or GND. For 300-kHz oscillator, connect to REF. 12 SHDN Shutdown logic input, active low. Connect to VL for automatic turn-on. The 5-V VL supply will not be disabled in shutdown allow- ing connection to SHDN. 13 ON5 ON/OFF logic input disables the 5-V Buck Controller. Connect to VL for automatic turn-on. 14 SS5 Soft-start control input for 5 V Buck controller. Connect capacitor from SS5 to GND. 15 CS5 Current-sense input for 5 V Buck controller—this pins over current threshold is 100 mV referenced to FB3. 16 DH5 Gate-drive output for the 5-V supply high-side n-channel MOSFET. 17 LX5 Inductor connection for the 5-V supply. 18 BST5 Boost capacitor connection for the 5-V supply. 19 DL5 Gate-drive output for the 5-V supply rectifying n-channel MOSFET. 20 PGND Power Ground. 21 FB5 Feedback input for the 5-V Buck controller. 22 VL 5-V logic supply voltage for internal circuitry—able to source 5-mA external loads. VL remains on with valid voltage at V+. 23 V+ Supply voltage input. 24 DL3 Gate-drive output for the 3.3-V supply rectifying n-channel MOSFET. 25 BST3 Boost capacitor connection for the 3.3-V supply. 26 LX3 Inductor connection for the 3.3-V supply. 27 DH3 Gate-drive output for the 3.3-V supply high-side n-channel MOSFET. 28 FB3 Feedback input for the 3.3-V Buck controller. |
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