RT9607/A

13

DS9607/A-07 April 2011

www.richtek.com

Figure 2. Two- Phase Synchronous-Buck Converter Circuit

determined by following constraints.

μF, and the larger

the better. In general design, using 1

μF can provide better performance. At least one low-ESR capacitor should be used

to provide good local de-coupling. Here, to adopt either a ceramic or tantalum capacitor is suitable.

Vin

C

B

V

CB

+

-

BOOT1

PVCC

PVCC

UGATE1

PHASE1

LGATE1

PGND

Figure 3. Part of Bootstrap Circuit of RT9607/A

BOOT1

UGATE1

PHASE1

LGATE1

VCC

PVCC

PWM1

PWM2

RT9607/A

11

14

5

1

2

4

13

12

UGATE2

PHASE2

LGATE2

BOOT2

GND

PGND

10

1uF

12V

1uF

PHB83N03LT

PHB95N03LT

2uH

1uF

1000uF

1.2uH

12V

7

8

9

PHB83N03LT

PHB95N03LT

2uH

1uF

1000uF

1uF

V

CORE

1500uF

1500uF

3

6

L1

C1

L2

C5

C6

Q3

Q4

L3

C3

C4

Q2

Q1

C2

Cb1

D1

D2

Cb2

R1

C7

PWM1

PWM2

10

V

IN