Date: /20/06

SP7653 Wide Input Voltage Range, .3MHz, Buck Regulator

© Copyright 2006 Sipex Corporation

1

Date: 2/17/06

SP7653 Wide Input Voltage Range, 1.3MHz, Buck Regulator

© Copyright 2006 Sipex Corporation

SP7653

FEATURES

■

2.5V to 20V Step Down Achieved Using Dual Input

■

Output Voltage down to 0.8V

■

3A Output Capability

■

■

Highly Integrated Design, Minimal Components

■

1.3MHz Fixed Frequency Operation

■

■

Over Temperature Protection

■

Short Circuit Protection with Auto-Restart

■

Wide BW Amp Allows Type II or III Compensation

■

Programmable Soft Start

■

Fast Transient Response

■

High Efficiency: Greater than

95% Possible

■

Asynchronous Start-Up into a Pre-Charged Output

■

Small 7mm x 4mm DFN Package

■

U.S. Patent #6,922,041

Wide Input Voltage Range,

1.3MHz, Buck Regulator

The SP7653 is a synchronous step-down switching regulator optimized for high efficiency. The part is designed to be

especially attractive for dual supply, 12V to 20V distributed power systems stepped down with 5V used to power the

is designed to provide a fully integrated buck regulator solution using a fixed 1.3MHz frequency, PWM voltage mode

architecture. Protection features include Under Voltage Lock Out (UVLO), thermal shutdown and output short circuit

protection. The SP7653 is available in the space saving DFN package

.

TYPICAL APPLICATION CIRCUIT

Now Available in Lead Free Packaging

DESCRIPTION

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

BOTTOM VIEW

Heatsink Pad 1

Connect to Lx

Heatsink pad 2

Connect to GND

Heatsink pad 3

Connect to VIN

GND

COMP

UVIN

GND

SS

LX

LX

LX

LX

GND

GND

GND

BST

NC

LX

LX

LX

DFN PACKAGE

7mm x 4mm

SP7653

CBST

1uF

R3

200k ,1%

L1 IHLP2525CZER2R2M01

2.2uH, Irate=8A

U2

SPX5205

VIN

1

GND

2

EN

3

BYP

4

VOUT

5

C1

22uF

CVCC

2.2uF

U1

SP7653

PGND

1

PGND

2

PGND

3

GND

4

VFB

5

COMP

6

UVIN

7

GND

8

SS

9

VIN

10

VIN

11

VIN

12

VIN

13

LX

14

LX

15

LX

16

NC

17

BST

18

GND

19

GND

20

GND

21

VCC

22

LX

23

LX

24

LX

25

LX

26

DBST

CSS

22nF

CP1

3.3pF

3.30V

0-3A

16V

R2

21.5k ,1%

GND

C3

47uF

ALL RESISTORS & CAPACITORS ARE SIZE

0603 UNLESS OTHERWISE SPECIFIED.

C3:

CERAMIC

X5R

C5

22uF

Notes:

6.3V

12V

DCR=18m

VIN

SD101AWS

U1 Bottom-Side Layout should have

three Contacts which are

isolated from one another: QT-

Drain Contact, QB-Drain Contact and

Controller-GND Contact.

RZ3

158 ,1%

VOUT

GND2

R4

100k ,1%

C2

0.1uF

C1,C5:

CERAMIC

X5R

16V

CZ3

820pF

CZ2

1.5nF

R1

68.1k ,1%

RZ2

38.3k , 1%

CF1

100pF

Fs=1.3MHz

RBST

5.11 ,

1%

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

BOTTOM VIEW

Heatsink Pad 1

Connect to Lx

Heatsink Pad 2

Connect to GND

Heatsink Pad 3

GND

COMP

NC

LX

LX

LX

LX

BST

LX

LX

LX

DFN PACKAGE

7mm x 4mm

SP7653

SS

GND

GND

GND

GND