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 2005 Semtech Corp.

www.semtech.com

SC4607

POWER MANAGEMENT

Design Example 2: 3.3V to 2.5V @ 20A application with SC4607

Application Information (Cont.)

Design Example 1: 3.3V to1.5V @12A application with SC4607

R3

1.05k

C3

4.7u

C2 1.5n

R1

20k

C1

270p

C18

0.1u

Vin=3.3V

C7

330u

D2

L1 1.3u

C5

22u

C4

22u

C17

1u

M11

M12

M22

C10

150u

M21

C9

2.7n

R8

365

Vo=2.5V/20A

R7

16.5k

R9

4.12k

R6

0

R5

0

C16

560pF

ETQPAF1R3EA

4TPD330M

4 x C3216X5R0J226M

2 x 4TPE150M

4 x Si7882

VCC

2

ISET

3

COMP

4

FS/SY NC

5

BST

1

DRVH

10

DRVL

8

VSENSE

6

GND

7

PHASE

9

U1

SC4607

C13

22u

C14

22u

C11

150u

R13

1

R3

C3

4.7u

C2 2.2n

C7

330u

R1

14.3k

C1

270p

C14

100u

Vin=3.3V

D2

L1

2.3u

C5

22u

C4

22u

C71

1u

M1

R6

0

R5

0

C13

100u

M2

C11

22u

C9

5.6n

R8

169

Vo=1.5V/12A

R7

8.25k

R9

4.12k

C16

560pF

C10

22u

VCC

2

ISET

3

COMP

4

FS/SY NC

5

BST

1

DRVH

10

DRVL

8

VSENSE

6

GND

7

PHASE

9

U1

SC4607

R13

1