SC2441EVB View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

SC2441EVB

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

Semtech Corporation 

SC2441

POWER MANAGEMENT

Block Diagram

SYNC/SHDN

6

ROSC

10

OSCILL ATO R

CLK

COMP1

12

FB1

11

0.5V

SHDN

-

EA1

+

SLOPE1

CLK2

FREQUENCY

DIVIDER CLK1

SLOPE COMP

SLOPE2

-

PWM1

+

1.25V

REFERENCE

0.5V 0.36V

R

Q

S

SHDN

VIN UVLO

1.60/1.74V

UVLO

4.45/4.65V

Non-Overlapping

Condu ction

Control

CS1+

4

CS1-

5

+

ISEN1

-

++

Σ

50mV

+

ILIIM1

-

1.25V -

+

COMP2

13

FB2

14

0.5V

-

EA2

+

SEL

ANALOG SWITCH

SLOPE2

-

PWM2

+

FAULT

Soft-Start

And

Overload

Hiccup

Control 1

OL

DSBL

CLK2

R

Q

S

BA

SEL

Y

Non-Overlapping

Condu ction

Control

VCC

CS2+

16

CS2-

15

GND

9

+

ISEN2

-

+

+

Σ

50mV

+

ILIIM2

-

FAULT

Soft-Start

And

Overload

Hiccup

Control 2

OL

DSBL

Step-down Controllers Functional Diagram

IN

1

PVIN

28

VCC

21

BST1

25

GDH1

23

VPN1

26

GDL 1

22

PGND

24

SS1/EN1

3

BST2

18

PVIN

GDH2

19

VPN2

2

GDL 2

20

SS2/EN2

17

Figure 2

 2005 Semtech Corp.

8

www.semtech.com

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