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SC1109

SYNCHRONOUS PWM CONTROLLER WITH DUAL LOW DROPOUT REGULATOR CONTROLLERS

Semtech Corporation 

PRELIMINARY - October 16, 2000

BLOCK DIAGRAM

SYNCHRONOUS PWM CONTROLLER WITH

DUAL LOW DROPOUT REGULATOR

CONTROLLERS

SC1109

VCC

1.2V

Bandgap

-10%

+10%

VBG

UVLO

+

-

PWRGD

VOSENSE

SS/EN

-

+

-

+

VCC VBG

-

ERROR AMP

+

10uA

0.8V

+

SS/EN

-

+

0.6V

-

OSCILLATOR

PWM

-

+

SET DOMINATES

S

Q

R

HICCUP LATCH

2uA

5VSTBY

STBY

BCAP+

CHARGE

PUMP

OVER

CURRENT

200mV

+

-

HIGH

SIDE

DRIVE

R

Q

S

SHOOT

THRU

CONTROL

VCC

LOW

SIDE

DRIVE

FAULT

5VSTBY

OSCILLATOR

LOW SIDE OFF

5VSTBY

VBG

+

-

5VSTBY

VBG

+

-

BCAP-

BST

DH

PHASE

DL

GND

GATE2

LDOS2

GATE1

LDOS1

© 2000 SEMTECH CORP.

5

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

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