SC2446A Ver la hoja de datos (PDF) - Semtech Corporation

Número de pieza

componentes Descripción

Fabricante

SC2446A

Dual-Phase, Single or Dual Output Synchronous Step-Down Controller

Semtech Corporation 

POWER MANAGEMENT

Block Diagram

SC2446A

SYNC

6

ROSC

3

COMP1

5

IN1-

4

REF

8

CS1+

1

CS1-

2

REFOUT

9

OSCILLATOR

CLK

CLK2

FREQUENCY

DIVIDER

CLK1

1.25V

REFERENCE

SLOPE COMP

0.5V

-

EA1

+

SLOPE1

SLOPE2

-

PWM1

+

R

Q

S

+

ISEN1

-

++

Σ

50mV

75mV

+

-ILIIM1+

-

ILIM1 -

+

UV

OCN1

Soft-Start

And

Overload

Hiccup

Control 1

OL1

DSBL1

0.5 (REFOUT)

+

0.5V

-

-

COMP2

11

IN2-

12

REFIN

10

+

1.8V

-

+

-

EA2

+

SLOPE2

CS2+

14

CS2-

13

+

ISEN2

-

++

Σ

50mV

75mV

+

ILIIM2

-

-

ILIM2 -

+

SEL

ANALOG

SWITCH

-

PWM2

+

CLK2

0.5 (REFIN)

R

Q

S

UV

OCN2

Soft-Start

And

Overload

Hiccup

Control 2

OL2

DSBL2

0.5 (REFIN)

BA

Y

UVLO

4.3/4.5V

SEL

Figure 3. SC2446A Block Diagram

AVCC

16

BST1

26

GDH1

25

VPN1

27

GDL1

24

PGND

22

SS1/EN1

28

VIN2

17

PVCC

23

AGND

7

BST2

19

GDH2

20

VPN2

18

GDL2

21

SS2/EN2

15

 2005 Semtech Corp.

8

www.semtech.com

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