SYNCHRONOUS PWM CONTROLLER WITH

DUAL LOW DROPOUT REGULATOR

CONTROLLERS

© 2000 SEMTECH CORP.

PRELIMINARY - October 16, 2000

SC1109

4

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

Pin

Pin Name

Pin Function

1

LDOS1

Sense Input for LDO1

2

GATE1

Gate Drive Output LDO1 (1.8V)

3

STBY

5V Standby Input, supplies power for

Ref, Charge Pump, Oscillator and FET

controllers.

4

BCAP+

Positive Connection to Boost Capacitor

5

BCAP-

Negative Connection to Boost Capacitor

6

GND

Ground

7

PHASE

Phase Node

8

DL

Low Side Driver Output

9

DH

High Side Driver Output

10

BST

Boost Input

11

VCC

Power Supply Input

12

PWRGD

Open Collector Power Good Flag for

1.2V Output

13

VOSENSE

Output Sense Input for 1.2V Output

14

SS/EN

Soft Start/ Enable

15

GATE2

Gate Drive Output LDO2 (2.5V)

16

LDOS2

Sense Input for LDO2

Top View

(16 Pin SOIC)

GATE1

LDOS1

STBY

BCAP+

BCAP-

GND

PHASE

DH

LDOS2

GATE2

SS/EN

PWRGD

VOSENSE

VCC

BST

DL

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

PIN DESCRIPTION

PIN CONFIGURATION