SI786LSG-E3【PDF 7/16 页】IC REG QD BUCK/LINEAR 28SSOP

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Sheet目录46

3页 4页 5页 6页 [7页]8页 9页 10页 11页

Document Number: 70189

S-40807-Rev. J, 26-Apr-04

www.vishay.com

Vishay Siliconix

Si786

Product is End of Life 3/2014

PIN CONFIGURATION AND ORDERING INFORMATION

SSOP-28

BST

V+

T Vi w

GND

PGND

REF

YNC

BST

HDN

PIN DESCRIPTION

Pin Symbol

Description

1 CS

Current-sense input for 3.3 V Buck controller - this pins over current threshold is 100 mV with respect to FB

2 SS

Soft-start input for 3.3 V. Connect capacitor from SS

to GND.

ON/OFF

logic input disables the 3.3 V Buck controller. Connect directly to V

for automatic turn-on.

4 D

Comparator #1 noninverting input, threshold = 1.650 V. Comparator #1 output = Q1. Connect to GND if unused.

5 D

Comparator #2 noninverting input (see D

6 V

External bias supply-voltage input for comparators #1 and #2.

Comparator #2 output. Sources 20 礎 from V

when D

is high. Sinks 500 礎 to GND when D

is low regardless of V

input voltage.

8 Q

Comparator #1 output (see Q

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 礔/mA output or 0.22 礔 minimum. For external clock

synchronization, a rising edge starts a new cycle to start. To use internal 200 kHz oscillator, connect to V

or GND. For

300kHz oscillator, connect to REF.

12 SHDN

Shutdown logic input, active low. Connect to V

for automatic turn-on. The 5 V V

supply will not be disabled in shutdown

allowing connection to SHDN

13 ON

ON/OFF

logic input disables the 5 V Buck Controller. Connect to V

for automatic turn-on.

14 SS

Soft-start control input for 5 V Buck controller. Connect capacitor from SS

to GND.

15 CS

Current-sense input for 5 V Buck controller - this pins over current threshold is 100 mV referenced to FB

16 DH

Gate-drive output for the 5 V supply high-side N-Channel MOSFET.

17 LX

Inductor connection for the 5 V supply.

18 BST

Boost capacitor connection for the 5 V supply.

19 DL

Gate-drive output for the 5 V supply rectifying N-Channel MOSFET.

20 PGND Power Ground.

21 FB

Feedback input for the 5 V Buck controller.

22 V

5 V logic supply voltage for internal circuitry - able to source 5 mA external loads. V

remains on with valid voltage at V+.

23 V+ Supply voltage input.

24 DL

Gate-drive output for the 3.3 V supply rectifying N-Channel MOSFET.

25 BST

Boost capacitor connection for the 3.3 V supply.

26 LX

Inductor connection for the 3.3 V supply.

27 DH

Gate-drive output for the 3.3 V supply high-side N-Channel MOSFET.

28 FB

Feedback input for the 3.3 V Buck controller.

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