LX1661CD Microsemi Analog Mixed Signal Group, LX1661CD Datasheet

LX1661CD

Manufacturer Part Number

LX1661CD

Description

IC PWM MONO SWITCHING REG 16SOIC

Manufacturer

Microsemi Analog Mixed Signal Group

Datasheet

1.LX1660CD.pdf (15 pages)

Specifications of LX1661CD

Applications

Controller, Intel Pentium®

Voltage - Input

10.8 ~ 13.2 V

Number Of Outputs

Voltage - Output

Operating Temperature

0°C ~ 70°C

Mounting Type

Surface Mount

Package / Case

16-SOIC

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

LX1661CD

Manufacturer:

LINFINITR

Quantity:

20 000

Current page: 1 of 15
Download datasheet (377Kb)

Rev. 1.1a,2005-03-09

The LX1660 and LX1661 Are Monolithic

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

other microprocessors.

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 applications.

H E

LX1661 I

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

ROCESSOR

PPLICATION

R14, 1%

See Table 5

R15

2.0k

N F I N I T E

R16

10k

0.1µF

UPPLY

OCKET

O W E R

11861 W

390pF

O F

390pF

ESTERN

Note: Available in Tape & Reel. Append the letters “TR” to the part number.

(i.e. :LX1661CD-TR)

D E S C R I P T I O N

OUTEN

0 to 70

I N

(°C)

N N O V A T I O N

VENUE

SGND

INV

NINV

HICCUP

I N I T Y

REF

ADJ

16-pin SOIC

, G

Short-Circuit

Expensive Current Sense Resistors. The

current sensing mechanism can use a PCB trace

resistance or the parasitic 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

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 capacitors to meet stringent transient

over and under-shoot specifications.

P R O D U C T H I G H L I G H T

RoHS Compliant / Pb-free

LX1661

ARDEN

P A C K A G E O R D E R I N F O

Transition DC: 0503

LX166xCN

Plastic DIP

16-Pin

SYNCEN

I C R O E L E C T R O N I C S

PGND

ROVE

BDRV

TDRV

CS+

CS-

Transient

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

Current

12V

1µF

Response

Limiting

R O D U C T I O N

D V A N C E D

IRL3103

RoHS Compliant / Pb-free

Transition DC: 0440

Plastic SOIC

16-Pin

LX166xCD

390pF

Without

Reduces

5µH Toroid

N C

: 714-893-2570

R5, 1k

R6, 1k

P W M C

Sanyo MV-GX or equivalent

16V, 1000µF

A T A

R1, 5m

O N T R O L L E R

Designed To Drive A

Synchronous Rectifier Stage —

Can Also Be Used In Non-

Synchronous Applications

Soft-Start Capability

Hiccup-Mode Fault Protection

No Current-Sense Resistor

Required For Current Limiting

Modulated Constant Off-Time

Control Mechanism For Fast

Transient Response And Simple

System Design

2V, 0.5% Internal Voltage

Reference Brought Out

Pentium Processor Supplies

AMD-K6TM Supplies

Cyrix® 6x86TM Supplies

Voltage Regulator Modules

General Purpose DC:DC

Supplies

A P P L I C A T I O N S

LX1660 / 1661

K E Y F E A T U R E S

H E E T

Sanyo MV-GX or

16V, 1000µF

equivalent

OUT

Related parts for LX1661CD

LX1661CD Summary of contents

Page 1

... A PPLICATION R14, 1% See Table 5 R15 2.0k 1% R16 10k C4 390pF C3 C8 0.1µF 390pF Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. :LX1661CD-TR) L Copyright © 1998 Rev. 1.1a,2005-03-09 11861 W ESTERN Short-Circuit Current Limiting Expensive Current Sense Resistors. The ...

Page 2

LX1660/1661 ...

Page 3

(Unless otherwise specified, 10.8 < V < 13.2, 0°C CC Parameter Symbol Reference Section Initial Output ...

Page 4

LX1660/1661 V CC ENABLE ADJ SGND REF 40mV ...

Page 5

Pin # Description low voltage at this pin puts the IC in sleep-mode. ...

Page 6

LX1660/1661 IC OPERATION Referring to the block diagram and typical application circuit, the output turns ON ...

Page 7

ERROR VOLTAGE COMPARATOR The error voltage comparator compares the feedback voltage at the positive side of ...

Page 8

LX1660/1661 C10 0.1µF LX1670 VIDO 10K D4B V SENSE ...

Page 9

1/2 LM358 R24 R16 10k 1k, 1% Jumper R23, 20k 1% ...

Page 10

LX1660/1661 The LX1660/61 devices are very easy to design with, requiring only a few simple calculations ...

Page 11

INPUT CAPACITOR The input capacitor and the input inductor are to filter the pulsating current generated ...

Page 12

LX1660/1661 CURRENT LIMIT (continued) Recommended sense resistor sizes are given in the following table: TABLE 3 ...

Page 13

HICCUP CAPACITOR SELECTION (continued) The resulting time is the duration allowed for the 10% duty ...

Page 14

LX1660/1661 USING THE LX1660/1661 IN PROGRAMMABLE APPLICATIONS The LX1660/61 device may be used in conjunction with ...

Page 15

Input De-coupling (V ) Capacitor CC Ensure that this 1µF capacitor is placed as close ...

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