17

 2007 Semtech Corp.

www.semtech.com

SC4624

POWER MANAGEMENT

Operation

Application Information (Cont.)

Application Information (Cont.)

5V

5

5

4

4

3

3

2

2

1

1

D

D

C

C

B

B

A

A

5Vin

1Vout@4A

Title

Size

Document Number

Rev

Date:

Sheet

of

A2

Custom

1

1

Monday, June 25, 2007

Title

Size

Document Number

Rev

Date:

Sheet

of

A2

Custom

1

1

Monday, June 25, 2007

Title

Size

Document Number

Rev

Date:

Sheet

of

A2

Custom

1

1

Monday, June 25, 2007

SC4624

Application

Circuit

VIN=5V; Vout=1V/4A

Input(C9)/Output Capacitors(C4): Panasonic ECJ33YBOJ226M(22uF/6.3V)

L1: TOKO D104C(919AS-1R8N)

Switching Frequency=550kHz

R12: Multilayer chip inductors;

MLB-160808-0600R-S2

(1)

(2)

Note: (1,2) Option for stability

R9

28.7k

R9

28.7k

R11

47.5k

R11

47.5k

C5

opt

C5

opt

C3

1uF

C3

1uF

C8

270pF

C8

270pF

R6

10k

R6

10k

U1

SC4624

U1

SC4624

COMP

10

FB

11

PGOOD

6

SYNC/EN

14

VCC

5

SS

3

NC

9

NC

7

FS

4

AGND

13

VCC

12

PH1

17

PH2

18

PH3

19

NC

8

ISET

2

PVIN1

1

PVIN2

20

PGND1

15

PGND2

16

C11

opt

C11

opt

R2

10R

R2

10R

C7

47nF

C7

47nF

R12

MLB-160808-0600R-S2

R12

MLB-160808-0600R-S2

R1

20k

R1

20k

C9

22uF

C9

22uF

R8

2.32k

R8

2.32k

C2

390pF

C2

390pF

R7

28.7k

R7

28.7k

R5

10k

R5

10k

C1

2.2pF

C1

2.2pF

C4

22uF

C4

22uF

R4

opt

R4

opt

C6

1nF

C6

1nF

R3

30k

R3

30k

L1

1.8uH

L1

1.8uH