SC2446ITETRT View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC2446ITETRT

Dual-Phase Single or Two Output Synchronous Step-Down Controllers

Semtech Corporation 

1 2 3 4 5 6 7 8 9 10 Next

POWER MANAGEMENT

Block Diagram

SYNC

6

ROSC

3

COMP1

5

IN1-

4

REF/IN1+

8

OSCILLATOR

-

EA1

+

+ 0.5V

-

-

+PWM

CS1+

1

CS1-

2

+

- ISEN

SLOPE

+

+COMP

Σ

COMP2

11

IN2-

12

REFIN/IN2+

10

REFOUT

9

AGND

7

75mV

110mV

+- ILIM+

-

ILIM-

+

-

EA2

+

+-

OCN

0.72 VREFOUT

CLK2

CLK1

REFERENCE

R

Q

S

UVLO

0.75 VREF

Soft-Start And OL

Overload

DSBL

Hiccup

Control

UVLO

4.3/4.5V

Non-Overlapping

Conduction

Control

Figure 3. SC2446 Block Diagram (Channel 1 PWM Control Only)

OCN

IN-

-

0.75(VREF)

+

/ 0.72(VREFOUT)

SS/EN

2 µΑ

0.5V/3.2V

UVLO

0.9V/1.2V

S

Q

OL

R

DSBL

SC2446

AVCC

16

BST1

26

GDH1

25

PVCC

23

GDL1

24

VPN1

27

PGND

22

SS1/EN1

28

GDH2

20

VIN2

17

VPN2

18

GDL2

21

3 .4µΑ

 2004 Semtech Corp.

Figure 4. Soft-Start and Overload Hiccup Control Circuit

8

www.semtech.com

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