SC1159 Ver la hoja de datos (PDF) - Semtech Corporation

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SC1159

Programmable Synchronous DC/DC Hysteretic Controller with VRM 8.5 VID Range

Semtech Corporation 

SC1159

POWER MANAGEMENT

Pin Descriptions (Cont.)

Pin #

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

Pin Name

DRV

VIN12V

BOOT

HIGHDR

BOOTLO

HISENSE

LOSENSE

IOUTLO

INHIBIT

VID25

VID3

VID2

VID1

VID0

PWRGD

Pin Function

Drive Regulator for the MOSFET Drivers.

12V Supply. Connect to 12V power rail.

Bootstrap. This pin is used to generate a floating drive for the high side FET driver.

High Side Driver Output. Connect to gate of high side MOSFET.

Bootstrap Low. In desktop applications, this pin connect to DRVGND.

High Current Sense. Connected to the drain of the high side FET,or the input side of a

current sense resistor between the input and the high side FET.

Low Current Sense. Connected to the source of the high side FET, or the FET side of a

current sense resistor between the input and the high side FET.

This is the sampling capacitors bottom leg. Voltage on this pin is voltage on the

LOSENSE pin when the high side FET is on.

Inhibit. If this pin is grounded, the MOSFET drivers are disabled. Usually connected to

+5V through a pull-up resistor.

Programming Input .

Programming Input.

Programming Input.

Programming Input.

Programming Input .

Power Good. This open collector logic output is high if the output voltage is within

15% of the set point.

 2002 Semtech Corp.

9

www.semtech.com

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