SC2441ITSTRT 查看數據表（PDF） - Semtech Corporation

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SC2441ITSTRT

Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter

Semtech Corporation 

SC2441

POWER MANAGEMENT

Block Diagram

COMP3

8

FB3

7

1.25V

-

EA3

+

CLK

-

PWM3

+

R

Q

S

SLOPE

COMP

+

ILIM3

-

++

Σ

14mV

+

ISEN3

-

Figure 3

Step-up Converter Functional Diagram

PH3

27

7mΩ

24

PGND

FB

0.36V

SS/EN

+

-

2µΑ

0.47V/3.25V

FAULT

0.6V/0.9V

S

Q

OL

R

DSBL

Figure 4

3µΑ

Details of the Soft-start and

Overload Hiccup Control Circuit

 2005 Semtech Corp.

9

www.semtech.com

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