SC4524CSETRT View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC4524CSETRT

28V 2A Step-Down Switching Regulator

Semtech Corporation 

SC4524C

Block Diagram

COMP

6

FB

7

-

+ EA

+

V1

SLOPE

COMP +

S

+

+

ISEN

-

OC

+

ILIM

18mV

-

BST

8

ROSC

3

FREQUENCY

FOLDBACK

+

PWM

-

OSCILLATOR

S

Q

R

CLK

SS/EN

5

A1 +

-

R

1.2V

R

1V

1.9V

REFERENCE

& THERMAL

SHUTDOWN

FAULT

SOFT-START

AND

OVERLOAD

HICCUP

CONTROL

Figure 2 — SC4524C Block Diagram

IN

2

5.5mW

POWER

TRANSISTOR

1

SW

GND

4

SS/EN

1.9V

IC

2.4mA

-

+

B4

B1

1V/2.15V

S

Q

R

B2

OVERLOAD

FAULT

ID

3.9 mA

_S

Q

R

B3

OC

PWM

Figure 3 — Soft-start and Overload Hiccup Control Circuit



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