Nov3-06 Rev L

SP7663 Wide Input Voltage Range 6A, 600kHz Buck Regulator

© 2006 Sipex Corporation

SP7663

FEATURES

■

4.75V to 22V Input Voltage Range using Single Supply

■

3V to 22V Input Voltage Range using Dual Supply

■

±% 0.8V Reference

■

6A Output Capability

■

Current Limiting using Inductor DCR

■

■

600 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% Poss ble

■

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

6A, 600kHz, Buck Regulator

TheSP7663isasynchronousstep-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 SP7663

providesafullyintegratedbuckregulatorsolutionusingafixed600kHzfrequency,PWMvoltagemodearchitecture.

Protection features include UVLO, thermal shutdown, output current limit and short circuit protection. The SP7663

is available in the space saving DFN package

.

TYPICAL APPLICATION CIRCUIT

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

GND

COMP

SWN

LX

LX

LX

LX

BST

LX

LX

LX

DFN PACKAGE

7mm x 4mm (Option 2)

SP7663

VINP

SS

ISN

ISP

GND

GND

GND

Pin 27

Pin 28

Pin 29

RBST

ZeroΩ

C4 .1uF

R8 DNP

C6

DNP

C7

DNP

12V

CBST

6.8nF

L1

1.5uH, 5.5 mΩ

C3

DNP

CVCC

4.7uF

SD101AWS

U1

SP7663

PGND

1

PGND

2

PGND

3

PGND

4

GND

5

VFB

6

COMP

7

SS

8

GND

9

ISN

10

ISP

11

SWN

12

VIN

13

LX

14

LX

15

LX

16

BST

17

VIN

18

GND

19

GND

20

UVIN

21

VCC

22

LX

23

LX

24

LX

25

LX

26

C8

NP

DBST

CSS 47nF

CP1 10pF

3.30V, 0-6A

R2

21.5kΩ,1%

D1

C5

100uF

RZ3

3.09KΩ

CZ3

180pF

CZ2

270pF

R1

68.1kΩ,1%

RZ2

75KΩ,1%

CF1

100pF

C1

22uF

C2

22uF

VOUT

3

1

GND

4

1

VIN

1

1

GND

2

1

C9 6.8nF

R9

NP

R6

NP

R7

NP

R3

4.99KΩ

R4

4.99KΩ

NP

Rs2

1 Ohm

Cs2

2.2nF

ISP

ISN

ISN

ISP

R13

3.3Ω

LX

LX

Rs1

1 Ohm

Cs1

2.2nF

R12

NP