14

© 2004 Semtech Corp.

www.semtech.com

POWER MANAGEMENT

SC2677B

C39

1uF

C20

C4

M7

C10

4.7uF

R22

2.32K

DCR=4mohm

CS1+

PWRGD

C56

R51

5.76K

C28

1uF

Enable/Disable

Circuit (option)

C59

1uF

R9

10.0K

VP1

+12V

+3.3V

D1

Vout1

L2

2uH

CS2-

C9

4.7uF

VP2

(1)

R24

4.87K

R48

3K

R13

4.64k

Q1

C24

0.1uF

C33

33nF

CS2+

M1

IPD09N03LA

R5

7.5K

C60

1nF

C25

1uF

Enable

C63

220nF

C40

4.7uF

C62

220nF

(1)

C19

U1

SC2677B

D2

R19

5.9K

R35

1.0

R36

0R0

1.4V@20A

R12

300

C6

1uF

Vout

C57

C47

Note (1) : Current Scale. Master channel current w eighting factor is around 0.68 * Io, Slaver is around 0.32 * Io

Q2

VP1

D3

1N4148

+5V

D5

R14

8.06K

L1

2uH

R21

2.1K

DCR=4mohm

M5

IPD09N03LA

C21

1nF

CS1-

C35

220nF

C36

0.1uF

C37

R11

10.0K

M3

R31

2.2

D4

1N4148

R8

1.78K

R26

4.3K

C46

R10

1.00K

C43

+12V

C1

4.7uF

C23

1uF

C38

1uF

Vout

R1

1.0

R50

6.34K

C26

47nF

VP2

Single Output, Current Share Mode

Evaluation Schematic (Cont.)