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LIN D

O C

#:

1660

LX1660/1661

A

DVANCED

PWM C

ONTROLLER

T

H E

I

N F I N I T E

P

O W E R

O F

I

N N O VA T I O N

P

R O D U C T I O N

D

A T A

S

H E E T

DESCRIPTION

The LX1660 and LX1661 Are Mono-

lithic Switching Regulator Controller

ICs

designed to provide low-cost, high-

performance adjustable power supply for

microprocessors and other applications

requiring a fast transient response and a

high degree of accuracy. They provide

an adjustable synchronous Pulse Width

Modulator output suitable for a power

supply for Pentium

廬

or other micropro-

cessors.

Synchronous Rectifier Driver For

CPU Core.

The devices can drive dual

MOSFETs resulting in typical efficiencies

of 85 - 90%, even with loads in excess of

10A. Synchronous shutdown results in

increased efficiency in light load applica-

tions.

Short-Cir cuit Current Limiting

Without Expensive Current Sense Re-

sistors.

The current sensing mechanism

can use a PCB trace resistance or the para-

sitic resistance of the main inductor. For

applications requiring a high degree of

accuracy, a conventional sense resistor

can be used.

Hiccup Mode Fault Protection.

The

hiccup mode is programmable and with

pulse-by-pulse current limiting will help

protect the power supply system and load

in the even of a short circuit.

Ultra-Fast Transient Response Re-

duces System Cost.

The fixed frequency

modulated off-time architecture results in

the fastest transient response for a given

inductor. Adaptive voltage positioning

(LX1661 only) requires fewer low-ESR ca-

pacitors to meet stringent transient over-

and under-shoot specifications.

K E Y F E AT U R E S

s

Designed To Drive A Synchronous Rectifier

Stage 鈥?Can Also Be Used In Non-

Synchronous Applications

s

Soft-Start Capability

s

Hiccup-Mode Fault Protection

s

No Current-Sense Resistor Required For

Current Limiting

s

Modulated Constant Off-Time Control

Mechanism For Fast Transient Response And

Simple System Design

s

2V, 0.5% Internal Voltage Reference Brought

Out

A P P L I C AT I O N S

s

Pentium Processor Supplies

s

s

s

s

AMD-K6

TM

Supplies

Cyrix

廬

6x86

TM

Supplies

Voltage Regulator Modules

General Purpose DC:DC Supplies

IMPORTANT:

For the most current data, consult LinFinity's web site:

http://www.linfinity.com.

PRODUCT HIGHLIGHT

LX1661 I

N

S

OCKET

7

P

ROCESSOR

S

UPPLY

A

PPLICATION

OUTEN

12V

V

IN

5V

C2

C7

R14, 1%

See Table 5

R15

2.0k

1%

R16

10k

C4

390pF

Q1

IRL3103

16V, 1000碌F

Sanyo MV-GX or equivalent

V

OUT

U1

LX1661

1

2

3

4

5

6

7

8

EN

OT

ADJ

SGND

V

REF

INV

NINV

HICCUP

C

T

16-pin SOIC

V

C1

TDRV

PGND

BDRV

V

CC

SYNCEN

CS+

CS-

16

15

14

13

12

11

10

9

C9

1碌F

L1

5碌H Toroid

D1

R1, 5m

C5

C6

16V, 1000碌F

Sanyo MV-GX or

equivalent

R5, 1k

C1

390pF

C3

0.1碌F

C8

390pF

R6, 1k

PA C K A G E O R D E R I N F O R M AT I O N

T

A

(擄C)

0 to 70

N

Plastic DIP

16-pin

LX166xCN

D

Plastic SOIC

16-pin

LX166xCD

Note: All surface-mount packages are available in Tape & Reel.

Append the letter "T" to part number. (i.e. LX166xCDT)

Copyright 漏 1998

Rev. 1.1 7/98

L

IN

F

INITY

M

ICROELECTRONICS

I

NC

.

11861 W

ESTERN

A

VENUE

, G

ARDEN

G

ROVE

, CA. 92841, 714-898-8121, F

AX

: 714-893-2570

1

next

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