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SP7661

Wide Input Voltage Range

3A, 600kHz, Buck Regulator

FEATURES

SP7661

DFN PACKAGE

7mm x 4mm (Option 2)

LX 26

LX 25

LX 24

LX 23

V

CC

22

Pin 27

1

BOTTOM VIEW

Heatsink Pad 1

Connect to Lx

2

3

4

5

6

7

Heatsink Pad 2

Connect to GND

Pin 28

Heatsink Pad 3

Connect to V

INP

Pin 29

8

9

P

GND

P

GND

P

GND

P

GND

GND

V

FB

COMP

SS

GND

PowerBlox

TM

鈻? 4.75V to 22V Input Voltage Range using Single Supply

鈻? 3V to 22V Input Voltage Range using Dual Supply

鈻? 鹵1% 0.8V Reference

鈻? 3A Output Capability

鈻? Current Limiting using Inductor DCR

鈻? Built in Low R

DS(ON)

Power Switches

鈻? 600kHz Fixed Frequency Operation

鈻? Over Temperature Protection

鈻? Short Circuit Protection with Auto-Restart

鈻? Wide BW Amp Allows Type II or III Compensation

鈻? Programmable Soft Start

鈻? Fast Transient Response

鈻? High Efficiency: Greater than 93% Possible

鈻? Nonsynchronous Start-Up into a Pre-Charged Output

鈻? Available in RoHS Compliant, Lead Free Packaging:

Small 7mm x 4mm DFN

鈻? U.S. Patent #6,922,041

UV

IN

21

GND 20

GND 19

V

IN

18

BST 17

LX 16

LX 15

LX 14

10 ISN

11 ISP

12 SWN

13 VINP

DESCRIPTION

The SP7661 is a synchronous step-down switching regulator optimized for high efficiency. The part is designed

for use with a single 4.75V to 22V single supply or 3V to 22V input if an external Vcc is provided. The SP7661

provides a fully integrated buck regulator solution using a fixed 600kHz frequency, PWM voltage mode architecture.

Protection features include UVLO, thermal shutdown, output current limit and short circuit protection. The SP7661

is available in the space saving DFN package

.

TYPICAL APPLICATION CIRCUIT

VOUT

3.30V, 0-3A



3

VIN





12V (9.6V-22V)

C2

22uF

C

22uF

28

27

LX

L1, Wurth -744311220

2.2uH, 14 mOhm, 7x7mm, 9A

R3

5.11k

C4 47nF

R9

ISP



GND PAD

GND



VFB

2

3

4

5

6

PGND

PGND

PGND

PGND

GND

VFB

COMP

SS

GND

ISN

ISP

SWN PAD

2

R4

5.11k

LX

LX

26

25

24

23

22

2

20

19

18

7

6

15

14

NC

61.9k

ISN

C5

100uF

RZ3

400



4

CZ2

6800pF

RZ2

4.02k

U1

SP7661

LX

LX

VCC

UVIN

GND

GND

VIN

BST

LX

CVCC

4.7uF

CZ3

1500pF

VFB

R

0k

GND

CP

56pF

CSS 47nF

7

8

9

0



CF1

100pF

R2

3.16k

VIN PAD

C9 6.8nF

ISN

ISP

LX

2

3

SWN

VIN

LX

LX

SD101AWS

DBST

22nF

CBST

29

LX

Rs2

1 Ohm

Cs2

2.2nF

Mar -07 Rev N

SP766 Wide Input Voltage Range 3A, 600kHz Buck Regulator

漏 2007 Sipex Corporation



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