LX1676_05 MICROSEMI [Microsemi Corporation], LX1676_05 Datasheet

LX1676_05

Manufacturer Part Number

LX1676_05

Description

Manufacturer

MICROSEMI [Microsemi Corporation]

Datasheet

1.LX1676_05.pdf (16 pages)

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Revision: 1.0, 4/12/2005

VRM power supply controller IC

featuring

regulator stages.

voltage-mode

configured as a single biphase high

current output core supply.

current (>25A) output is generated by

a LoadSHARE

balances the currents in the two

phases. Power loss and noise, due to

the ESR of the input capacitors, are

minimized by operating the PWMs

180° out of phase.

Correction Loop† provides except-

ional control of the output droop and

overshoot during very high di/dt load

changes, the circuit can be configured

for droop only, overshoot only or

both.

capacitor

IMPORTANT: For the most current data, consult MICROSEMI’s website:

† Patent numbers US6292378,US6285571,US6356063, US6605931

The LX1676 is a highly integrated

The

In biphase operation, the high

This architecture also minimizes

two

synchronized

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1676CLQ-TR)

two

5 B i t V I D

0 to 70

requirements

7 0 n H

PWM

constant

(°C)

† technique that

PWM

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

V i n + 5 V

phases

RoHS Compliant / Pb-free Transition DC: 0518

frequency

switching

Transient

D E S C R I P T I O N

while

Plastic TSSOP

38-Pin

are

T r a n s i e n t C o r r e c t i o n L o o p

L X 1 6 7 6

maximizing regulator response.

used for remote voltage sensing at the

processor core.

internal reference that will set the

output voltage. This VID code can be

changed during operation and the

reference will slew the output voltage to

its new setting at a preset rate. During

VID changes on the fly the Power Good

indication will stay valid.

MOSFET will be sampled using its

down.

voltage circuit will trip at a specified

setting and clamp the output by turning

off the upper MOSFETs and turning on

the lower MOSFETs.

a bootstrap capacitor to provide the

upper drive voltage over the input

voltage range of 6 to 24 volts.

LX1676CPW

DS(ON)

A true differential input amplifier is

A VID code generator provides an

Current through the lower phase 1

For further protection, an over

The upper MOSFET drivers will use

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

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

Integrated Products Division

for

Microsemi

http://www.microsemi.com

current

V i n 6 t o 2 4 V

Mobile AMD Athlon™ VRM Controller

limit and shut

RoHS Compliant / Pb-free Transition DC: 0512

RODUCTION

38-Pin

Plastic MLPQ

LX1676CLQ

High Current Biphase

Operation

Outputs As Low As 0.925V

† Biphase LoadSHARE

† Transient Correction Loop

Reduces Required

Capacitance

Differential Amplifier For

Remote Voltage Sensing

Integrated High Current

MOSFET Drivers

200KHz to 1MHz Frequency

Operation

Programmable Slew Rate

Control For Start-Up Sequence

and VID change

VID Changes On The Fly

Power Good Indicator

Short Circuit Protection

Output Over Voltage and

Under Voltage Protection

No current-sense resistors

AMD Mobile Athlon™ or

Duron™ Processor Core

Voltage Supply

Voltage Regulator Modules

ATA

K E Y F E A T U R E S

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

HEET

V o u t

LX1676

Page 1

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