EVQ28261-L-00A – 3A, 21V, 500kHz SYNCHRONOUS STEP-DOWN CONVERTER

EVQ28261-L-00A Rev.1.0

www.MonolithicPower.com

2

11/15/2011

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2011 MPS. All Rights Reserved.

EVALUATION BOARD SCHEMATIC

SS

PG

EN

GND

VIN

NS

C5

20k

R3

10k

R1

C3

1.2V/3A

GND

VCC

100k

R9

100k

R4

10k

R2

0

R6

C2A

C2C

VOUT

C1A

C4

30k

R8

C1B

20

R5

L1

10

R7

47nF

C7

15pF

C6

C2B

VCC

11

EN

7

IN

1

SW

PG

9

SS

10

FB

8

BST

6

2,3,4,5

U1

SW

FB

EN

VCC

VIN

PG

SS

T

U

O

V

W

S

FB

EVQ28261-L-00A BILL OF MATERIALS

Qty

Ref

Value

Description

Package

Manufacturer Part Number

1

C1A

22μF

Ceramic Cap., 25V, X5R

1210

Murata

GRM32ER61E226KE15L

1

C1B

0.1μF

Ceramic Cap., 25V, X7R

0805

HHEC

C0805X104K025T

2

C2A,C2B

22μF

Ceramic Cap., 6.3V, X5R

1210

Murata

GRM32DR60J226KA01L

1

C2C

0.1μF

Ceramic Cap., 16V, X7R

0805

Murata

GRM219R71C104KA01D

2

C3,C4

0.1μF

Ceramic Cap., 25V, X7R

0603

Yageo

CC0603KRX7R8BB104

0

C5

NS

0603

1

C6

15pF

Ceramic Cap., 50V,C0G

0603

TDK

C1608C0G1H150J

1

C7

47nF

Ceramic Cap., 50V,X7R

0603

Murata

GRM188R71H473KA61D

1

R1

10k

Film Res., 1%

0603

Yageo

RC0603FR-0710KL

1

R2

10k

Film Res., 1%

0603

Yageo

RC0603FR-0710KL

1

R3

20 kΩ

Film Res., 5%

0603

Any

2

R4,R9

100 kΩ

Film Res., 5%

0603

Any

1

R8

30 kΩ

Film Res., 5%

0603

Any

1

R5

20Ω

Film Res., 5%

0603

Any

1

R6

0Ω

Film Res., 5%

0603

Any

1

R7

10Ω

Film Res., 5%

0603

Any

1

L1

1.8μH

7.6mΩ, 10.4A

SMD

TOKO

D104C-919AS-1R8N

2.2μH

14mΩ, 13A

SMD

Wurth

744311220

1

U1

Step-Down Converter

QFN14

MPS

MPQ28261DL