MP38873 – 15A, 16V, HIGH FREQUENCY STEP-DOWN WITH SYNCHRONOUS GATE DRIVER

MP38873 Rev. 0.9

www.MonolithicPower.com

13

9/17/2009

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© 2009 MPS. All Rights Reserved.

Two Phase Operation

The MP38873 can be configured as a two-phase interleaving regulator to provide up to 30A load

current. The current balance is automatically achieved by connecting the two COMP pins together. See

Figure 7 for detail configurations.

MP38873

MP38873

R14

100k

R5

6.8k

R10

51

R13

51

R1

6.19k

R2

12.7k

R4

10

R8

100k

R3

100k

VIN

TRACK

C12

470uF

C1

22uF

C2

22uF

C5

0.1uF

C10

47uF

6.3V

C11

330uF

2V

C7

2.2nF

C8

150pF

C6

150pF

C4

1uF

C3

0.1uF

C9

10nF

PG

GND

VOUT

+

+

EN

U1

GND

FB

COMP

BG

SW

PG

BST

SW

SW

SW

SW

SW

SW

SYNCIN

SYNCOUT

CSS/TRK

VIN

VIN

VCC

L1

0.72uH/35A

M1

Si7336A

N-CH 30V 27A

WE-744325072

17

4

1

10

18

319

7

9

8

6

20

2

5

16

15

14

13

12

11

C5A

0.1uF

C10A

47uF

6.3V

C3A

0.1uF

R19

10

M2

Si7336A

N-CH 30V 27A

L2

0.72uH / 35A

WE-744325072

C11A

330uF

2V

C2A

22uF

C1A

22uF

C4A

0.1uF

VIN

VIN

VCC

U2

EN

SYNCIN

SYNCOUT

CSS/TRK

GND

FB

COMP

BG

SW

BST

PG

SW

SW

SW

SW

SW

SW

18

8

9

17

16

15

14

13

12

11

19

7

6

10

1

4

3

2

5

20

+

Figure 7—Two Phase Operation