1

Date: 7/28/04

SP6137 Wide Input, 900KHz Synchronous PWM Controll

© Copyright 2004 Sipex Corporation

SP6137

FEATURES

■ 2.5V to 20V Step Down Achieved Using Dual Input

■ Small 10-Pin MSOP Package

■ 2A to 15A Ouput Capability

■ Highly Integrated Design, Minimal Components

■ Short Circuit Protection with Auto-Restart

■ On-Board 1.5Ω sink (2Ω source) NFET Drivers

■ Programmable Soft Start

■ Fast Transient Response

■ High Efficiency: Greater than 94% Possible

■ A Synchronous Start-Up into a Pre-Charged Output

Wide Input, 900KHz Synchronous PWM Controller

DESCRIPTION

The SP6137 is a synchronous step-down switching regulator controller optimized for high efficiency. The part is

voltage minimizes power dissipation in the part. The SP6137 is designed to drive a pair of external NFETs using a fixed

900kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output

short circuit protection. The SP6137 is available in the cost and space saving 10-pin MSOP

.

®

TYPICAL APPLICATION CIRCUIT

GL

GND

COMP

SP6137

10 Pin MSOP

1

2

3

4

5

10

9

8

7

6

BST

GH

SWN

SS

UVIN

APPLICATIONS

■ 12V DPA

■ Communications Systems

■ Graphics Cards

Now Available in Lead Free Packaging

8 7 6 5

1 2 3

4

CSS

47nF

CBST

1µF

L1 SC5018-2R7M

2.7µH @ 12A

DCR=4.30mΩ

FDS6676S

14.5A, 6.0mΩ

C3

47µF

6.3V

R1

68.1k, 1%

1.8V @ 10A

R2

21.5k, 1%

10µF

6.3V

R3

221k, 1%

R4

100k, 1%

CF1

100pF

CZ2

820pF

CP1

56pF

RZ2

40.2k, 1%

FDS6676S

14.5A, 6mΩ

8 7 6 5

4

1 2 3

DBST

MBR0530

SP6137

1

2

3

4

5

10

9

8

7

6

VCC

GL

GND

VFB

COMP

BST

GH

SWN

SS

UVIN

GND 3

RLF

3.0,5%

U1

Ceramic

8050

X5R

QT

SS

GND2

C3, C4

Ceramic

1210

X5R

C4

47µF

6.3V

RZ3

4.64k, 1%

CZ3

220pF

C1

22µF

16V

C2

22µF

16V

GND

VIN

2.5V -20V

C1, C2

Ceramic

1210

X5R

R5

Bead

QB

= 5V @ 30mA

0.8V