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Date: 8/4/04

SP6132 Wide Input, 300KHz Synchronous PWM Controller

© Copyright 2004 Sipex Corporation

SP6132

FEATURES

■ 3V to 12V Step Down Achieved Using Dual Input

■ 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

■ Wide BW Amp Allows Type II or III Compensation

■ Programmable Soft Start

■ Fast Transient Response

■ High Efficiency: Greater than 95% Possible

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

■ Small 10-Pin MSOP Package

Wide Input, 300KHz Synchronous PWM Controller

DESCRIPTION

The SP6132 is wide input, synchronous step-down switching controller optimized for high efficiency. The part is

voltage minimizes power dissipation in the part. The SP6132 is designed to drive a pair of external NFETs using a fixed

300kHz frequency, PWM voltage mode architecture. Protection features include UVLO, thermal shutdown and output

short circuit protection. The SP6132 is available in the cost and space saving 10-pin MSOP

.

®

TYPICAL APPLICATION CIRCUIT

GL

GND

COMP

SP6132

10 Pin MSOP

1

2

3

4

5

10

9

8

7

6

BST

GH

SWN

SS

UVIN

8 7 6 5

1 2 3

4

CSS

47nF

L1 SC5018-2R7M

2.7µH @ 12A

DCR=4.30mΩ

C3

47µF

6.3V

R1

68.1k, 1%

3.3V

0 - 10 A

R2

21.5k, 1%

10µF

6.3V

R3

221k, 1%

R4

100k, 1%

CF1

100pF

CZ2

1500pF

CP1

22pF

fs=300Khz

RZ2

27.4k, 1%

FDS7088N3

21A, 5mΩ

8 7 6 5

4

1 2 3

DBST

MBR0530

SP6132

1

2

3

4

5

10

9

8

7

6

VCC

GL

GND

VFB

COMP

BST

GH

SWN

SS

UVIN

GND 3

U1

Ceramic

0805

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

12V

C1, C2

Ceramic

1210

X5R

R5

QB

5.11, 1%

ALL RESISTORS AND CAPS ARE 0603 UNLESS OTHERWISE SPECIFIED

Q1, Q2 BOTTOM SIDE DRAIN CONTACT

CBST

1µF

10V

FDS7088N3

C7

0.1µF

Now Available in Lead Free Packaging