SC2441A(2006) Просмотр технического описания (PDF) - Semtech Corporation

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Компоненты Описание

производитель

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

CKOUT

28

PLLF

2

SYNC/SHDN

6

ROS C

10

OSCI LLAT OR

AND

PHAS E

D ET ECT OR

COMP 1

12

SHDN

0.5V +

FB1

+ EA1

11

-

CLK2

FREQUENCY

DIVIDER CLK1

CLK SLOP E COMP

SLOP E2

-

PWM1

+

1.25V

R EF ER EN C E

0.5V 0.35V

R

Q

S

SHDN

SS1/EN1

3

GND

9

CS1+

4

CS1-

5

1.25V

2R

R

+

ISEN1

-

SLOP E1

+

+

S

25mV

+

-ILIM1

TG1O N

A2-

1.25V

Soft-Start

And

Overload

Hiccup

Control 1

OL1

DSBL 1

SEL

1.25V -

A1

+

SEL

COMP 2

13

FB2

14

0.5V

+

+ EA2

-

SS2/EN2

17

1.25V

2R

CS2+

16

CS2-

15

R

+

ISEN2

-

+S

+

ANALO G

SWITCH

-

PWM2

+

CLK2

R

Q

S

TG2O N

A3-

1.25V

Soft-Start

And

Overload

Hiccup

Control 2

OL2

DSBL 2

25mV

+

ILIIM2

-

SLOP E2

VIN UVLO

1.6/1.7V

FAULT

UVLO

4.3V/4.5V

Adaptive

Shoot- thro ugh

Protection

BA

Y

MUX

Adaptive

Shoot- thro ugh

Protection

VCC

Figure 2 Functional Diagram of the Step-down Controllers

IN

1

VCC

21

BST1

25

GDH1

23

GDL 1

22

PGND1

24

CH 1

CH 2

BST2

18

GDH2

19

GDL 2

20

 2006 Semtech Corp.

8

www.semtech.com

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