LX1662A Datasheet PDF ( Pinout ) - SINGLE-CHIP PROGRAMMABLE PWM CONTROLLERS WITH 5-BIT DAC

LX1662A Datasheet PDF - Microsemi Corporation

Part Number	*LX1662A*
Description	SINGLE-CHIP PROGRAMMABLE PWM CONTROLLERS WITH 5-BIT DAC
Manufacturers	Microsemi Corporation
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T H E I N F I N I T E P O W E R O F I N N O VAT I O N

L I N D O C # : 1662

LX1662/62A, LX1663/63A

SINGLE-CHIP PROGRAMMABLE PWM CONTROLLERS WITH 5-BIT DAC

PRODUCTION DATA SHEET

DESCRIPTION

The LX1662/62A and LX1663/63A are

Monolithic Switching Regulator Con-

troller IC’s designed to provide a low cost,

high performance adjustable power supply

for advanced microprocessors and other

applications requiring a very fast transient

response and a high degree of accuracy.

Short-Circuit Current Limiting with-

out Expensive Current Sense Resistors.

Current-sensing mechanism can use PCB

trace resistance or the parasitic resistance of

the main inductor. The LX1662A and

LX1663A have reduced current sense com-

parator threshold for optimum perfor-

mance using a PCB trace. For applications

requiring a high degree of accuracy, a

conventional sense resistor can be used to

sense current.

Programmable Synchronous Recti-

fier Driver for CPU Core. The main

output is adjustable from 1.3V to 3.5V using

a 5-bit code. The IC can read a VID signal

set by a DIP switch on the motherboard, or

hardwired into the processor’s package (as

in the case of Pentium® Pro and Pentium II

processors). The 5-bit code adjusts the

output voltage between 1.30 and 2.05V in

50mV increments and between 2.0 and 3.5V

in 100mV increments, conforming to the

Intel Corporation specification. The device

can drive dual MOSFET’s resulting in typical

efficiencies of 85 - 90% even with loads in

excess of 10 amperes. For cost sensitive

applications, the bottom MOSFET can be

replaced with a Schottky diode (non-syn-

chronous operation).

Smallest Package Size. The LX1662 is

available in a narrow body 14-pin surface

mount IC package for space sensitive appli-

cations. The LX1663 provides the additional

functions of Over Voltage Protection (OVP)

and Power Good (PWRGD) output drives

for applications requiring output voltage

monitoring and protection functions.

Ultra-Fast Transient Response Re-

duces System Cost. The modulated off-

time architecture results in the fastest tran-

sient response for a given inductor, reduc-

ing output capacitor requirements, and re-

ducing the total regulator system cost.

Over-Voltage Protection and Power

Good Flag. The OVP output in the LX1663

& LX1663A can be used to drive an SCR

crowbar circuit to protect the load in the

event of a short-circuit of the main MOSFET.

The LX1663 & LX1663A also have a logic-

level Power Good Flag to signal when the

output voltage is out of specified limits.

IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.

PRODUCT HIGHLIGHT

KEY FEATURES

I 5-bit Programmable Output For CPU Core

Supply

I No Sense Resistor Required For Short-

Circuit Current Limiting

I Designed To Drive Either Synchronous Or

Non-Synchronous Output Stages

I Lowest System Cost Possible For Price-

Sensitive Pentium And Pentium II Class

Applications

I Soft-Start Capability

I Modulated, Constant Off-Time Architecture

For Fast Transient Response And Simple

System Design

I Available Over-Voltage Protection (OVP)

Crowbar Driver And Power Good Flag

(LX1663 only)

I Small, Surface-Mount Packages

A P P L I C AT I O N S

I Socket 7 Microprocessor Supplies

(including Intel Pentium Processor, AMD-

K6TM And Cyrix® 6x86TM, Gx86TM and M2TM

Processors)

I Pentium II and Deschutes Processor & L2-

Cache Supplies

I Voltage Regulator Modules

I General Purpose DC:DC Converter

Applications

LX1662

IN A PENTIUM/PENTIUM II

SINGLE-CHIP POWER

SUPPLY SOLUTION

0.1µF

VID0

VID1

VID2

VID3

VID4

12V 5V

LX1662

1 SS

2 INV

CC_CORE

4 VID0

5 VID1

6 VID2

7 VID3

VC1 14

TDRV 13

GND 12

BDRV 11

VCC 10

CT 9

VID4 8

14-pin, Narrow Body SOIC

1µH

1µF

IRL3102

6.3V

1500µF x3

680pF

L1, 2.5µH

IRL3303

2.5m9

6.3V, 1500µF x 3**

** Three capacitors for Pentium

Four capacitors for Pentium II

Supply Voltage VOUT

for CPU Core

TA (°C)

PACKAGE ORDER INFORMATION

Plastic DIP

14-pin

Plastic DIP

16-pin

Plastic SOIC

14-pin

Plastic SOIC

16-pin

0 to 70

LX1662CN

LX1662ACN

LX1663CN

LX1663ACN

LX1662CD

LX1662ACD

LX1663CD

LX1663ACD

Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX1662CDT)

Rev. 1.1 11/99

LINFINITY MICROELECTRONICS INC.

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570

PRODUCT DATABOOK 1996/1997

LX1662/62A, LX1663/63A

SINGLE-CHIP PROGRAMMABLE PWM CONTROLLERS WITH 5-BIT DAC

PRODUCTION DATA SHEET

CHARACTERISTICS CURVES

Output Set Point

EFFICIENCY AT 3.1V

75 EFFICIENCY AT 2.8V

EFFICIENCY AT 1.8V

1 2 3 4 5 6 7 8 9 10 11 12 13 14

IOUT (A)

FIGURE 2 — Efficiency Test Results:

Non-Synchronous Operation, V = 5V

100

Output Set Point

EFFICIENCY AT 3.1V

75 EFFICIENCY AT 2.8V

EFFICIENCY AT 1.8V

1 2 3 4 5 6 7 8 9 10 11 12 13 14

IOUT (A)

FIGURE 3 — Efficiency Test Results:

Synchronous Operation, V = 5V

Output Set Point

1.8V EFFICIENCY

65 2.8V EFFICIENCY

3.3V EFFICIENCY

1 2 3 4 5 6 7 8 9 10 11 12 13 14

IOUT (A)

FIGURE 4 — Efficiency Test Results: Synchronous Operation, VIN = 12V.

Note: Non-synchronous operation not recommended for 12V operation, due to power loss in Schottky diode.

Rev. 1.1 11/99

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LX1662A Datasheet PDF - Microsemi Corporation

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