SC2441A(2006) 查看數據表（PDF） - Semtech Corporation

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SC2441A
(Rev.:2006)

1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter

Semtech Corporation 

POWER MANAGEMENT

Block Diagram

SC2441A

COMP3

8

CLK

SW3

27

FB3

7

1.25V

-

EA3

+

-

PWM3

+

R

Q

S

SLOPE

COMP

+

ILIM3

-

++

Σ

I-LIMIT

+

ISEN3

-

RSENSE

26 PGND2

Figure 3. Step-up Converter Functional Diagram

VCC

FB

0.35V

RSS

SS/EN

CSS

+

-C3

C1

0.5V/3.3V

-

C2

0.8V +

HICCUP

DISABLE

S

Q

R

L1

UV

SHDN

FAULT

Q1

10µA

UV = “1” IF VCC < 4.5V

SHDN = “1” IF SYNC/SHDN < 0.5V

S

Q

R

L2

OL

(OVERLOAD)

TURN OFF

GATE DRIVES

DSBL

TGON

Soft-Start and

Overload

Hiccup Control

Figure 2

Figure 4 Details of Soft-Start and Overload Hiccup Control Circuit

 2006 Semtech Corp.

9

www.semtech.com

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