Mar -07 Rev AJ

SP7662 Wide Input Voltage Range 2A, 300kHz Buck Regulator

© 2007 Sipex Corporation

SP7662

FEATURES

■

4.75V to 22V Input Voltage Range using Single Supply

■

3V to 22V Input Voltage Range using Dual Supply

■

±% 0.8V Reference

■

2A Output Capability

■

Current Limiting using Inductor DCR

■

■

300 kHz 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

■

HighEfficiency:Greaterthan

95% Possible

■

Nonsynchronous Start-Up into a Pre-Charged Output

■

AvailableinRoHSCompliant,LeadFreePackaging:

Small 7mm x 4mm DFN

■

U.S. Patent #6,922,04

Wide Input Voltage Range

12A, 300kHz, Buck Regulator

TheSP7662isasynchronousstep-downswitchingregulatoroptimizedforhighefficiency.Thepartisdesigned

for use with a single 4.75V to 22V single supply or 3V to 22V input if an external Vcc is provided. The SP7662 pro-

videsafullyintegratedbuckregulatorsolutionusingafixed300kHzfrequency,PWMvoltagemodearchitecture.

Protection features include UVLO, thermal shutdown, output current limit and short circuit protection. The SP7662

is available in the space saving DFN package

.

TYPICAL APPLICATION CIRCUIT

DESCRIPTION

SP7662

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

SWN

LX

LX

LX

LX

BST

LX

LX

LX

DFN PACKAGE

7mm x 4mm (Option 2)

VINP

SS

ISN

ISP

GND

GND

GND

Pin 27

Pin 28

Pin 29

5

5

4

4

3

3

2

2





D

D

C

C

B

B

A

A

ISP

ISN

ISN

LX

LX

ISP

NC

VFB

VFB

LX

SD0AWS

3.30V, 0-12A

12Vin (9.6V - 16V)

GND

2



C5

00uF

VOUT

3



U

SP7662

PGND



PGND

2

PGND

3

PGND

4

GND

5

VFB

6

COMP

7

SS

8

GND

9

ISN

0

ISP



SWN

2

VIN

3

LX

4

LX

5

LX

6

BST

7

LX

23

LX

24

LX

25

LX

26

CZ2

0nF

Rs

 Ohm

Rs2

 Ohm

C9 6.8nF

CP 00pF

RBST

5.

C

22uF

C3

22uF

R

0k

CBST

22nF

Cs

2.2nF

Cs2

2.2nF

C2

22uF

CVCC

4.7uF

GND

4



RZ3

453

R3

5.k

DBST

R9

6.9k

RZ2

4.02k

L, SC508-2R7M

2.7uH, 4. mOhm

R2

3.6k

VIN





C6

00uF

CSS 47nF

R4

5.k

CZ3

2200pF

C4

0.uF

CF

00pF