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SP6138

TM

Synchronous Buck Controller

UV

IN

BST

13

12 GH

11

10

9

V

CC

Now Available in Lead Free Packaging

DESCRIPTION

The SP638 is a synchronous step-down switching regulator controller optimized for small

footprint. The part is designed to be especially attractive for single supply step down con-

version from 5V to 24V. The SP638 is designed to drive a pair of external NFETs using a

fixed 2.5 MHz frequency, PWM voltage mode architecture. Protection features include UVLO,

thermal shutdown, output short circuit protection, and overcurrent protection with auto restart.

The device also features a PWRGD output and an enable input. The SP638 is available in

a space saving 6-pin QFN and offers excellent thermal performance.

TYPICAL APPLICATION CIRCUIT

VIN

C5

0.1uF

DBST

CVCC

4.7uF

SD101AWS

VIN

VCC

R3

10K鈩?/div>

POWERGOOD

NC

ENABLE

PWRGD

UVIN

EN

GND

BST

GH

SWN

RS1

1K鈩?/div>

GL

RS3

4.99K鈩?/div>

ISP

CSP

ISN

COMP

CP1

6 pF

VFB

SS

CSS

47nF

CZ3

47pF

CF1

18pF

CZ2

100pF

RZ2

54.9K鈩?/div>

RZ3

1K鈩?/div>

6.8nF

CS

0.1uF

R1

68.1K鈩? 1%

RS2

1K鈩?/div>

C2

22uF

CBST

0.1uF

MT/MB, Si7214DN

47 m鈩? 30V

(Co-Packaged FETs)

C1

4.7uF

12V

GND

COOPER, SD25-2R2

2.2uH, 2.8A, 31m鈩?/div>

VOUT

SP6138

3.3V

0-2A

PGND

GND

R2

21.5K鈩? 1%

Note: Die-attach paddle is connected to GND

Oct 24-06 Rev J

SP638 Synchronous Buck Controller

漏 2006 Sipex Corporation

PWRGD

FEATURES

鈻?/div>

5V to 24V Input step down converter

鈻?/div>

Up to 3A output in a small form factor

GL

鈻?/div>

Highly integrated design, minimal components

PGND

鈻?/div>

UVLO Detects Both V

CC

and V

IN

鈻?/div>

Overcurrent circuit protection with auto-restart

GND

鈻?/div>

Power Good Output, ENABLE Input

鈻?/div>

Maximum Controllable Duty Cycle Ratio up to 92%

V

FB

鈻?/div>

Wide BW amp allows Type II or III compensation

鈻?/div>

Programmable Soft Start

鈻?/div>

Fast Transient Response

鈻?/div>

Available in 6-Pin QFN package

鈻?/div>

External Driver Enable/Disable

鈻?/div>

U.S. Patent #6,922,04

16

1

2

3

4

15

14

SP6138

16 Pin QFN

3mm x 3mm

V

IN

SW

N

ISP

ISN

5

6

7

8

COMP

EN

SS

型號(hào)

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描述

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