SC1102

SYNCHRONOUS DC/DC CONTROLLER FOR

DISTRIBUTED POWER SUPPLY APPLICATIONS

© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

September 5, 2000

4

NOTE:

(1) All logic level inputs and outputs are open collector TTL compatible.

PIN DESCRIPTION

Pin #

Pin Name

Pin Function

1

VCC

Chip supply voltage

2

PWRGD

Logic high indicates correct output voltage

3

OVP

Over voltage protection.

4

OCSET

Sets the converter overcurrent trip point

5

PHASE

Input from the phase node between the MOSFET’S

6

DH

High side driver output

7

PGND

Power ground

8

DL

Low side driver output

9

BSTL

Bootstrap, low side driver.

10

BSTH

Bootstrap, high side driver.

11

SENSE

Voltage sense input

12

VREF

Buffered band gap voltage reference.

13

SS/SHDN

Soft start. A capacitor to ground sets the slow start time.

14

GND

Signal ground

CHARACTERISTIC CURVES

SC1102 Voltage Regulation, Vin=5V

-2%

-1%

0%

1%

2%

0

123

456

78

9

10 11 12

Current, A

3.3V

2.5V

2.0V

1.3V

SC1102 Effiency, Vin=5V

60%

70%

80%

90%

100%

01

23

45

678

9

10

11

12

Current, A

3.3V

2.5V

2.0V

1.3V