LX1676CPW Microsemi Analog Mixed Signal Group, LX1676CPW Datasheet

LX1676CPW

Manufacturer Part Number

LX1676CPW

Description

IC CTRLR PS VRM BIPHASE 38TSSOP

Manufacturer

Microsemi Analog Mixed Signal Group

Datasheet

1.LX1676CLQ.pdf (16 pages)

Specifications of LX1676CPW

Applications

Controller, AMD Athlon™ & Duron™

Voltage - Input

4.5 ~ 5.5 V

Number Of Outputs

Voltage - Output

0.93 ~ 2 V

Operating Temperature

0°C ~ 70°C

Package / Case

38-SSOP

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Mounting Type

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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

Related parts for LX1676CPW

LX1676CPW Summary of contents

Page 1

... The upper MOSFET drivers will use a bootstrap capacitor to provide the upper drive voltage over the input voltage range volts. http://www.microsemi.com Plastic TSSOP LQ 38-Pin RoHS Compliant / Pb-free Transition DC: 0512 LX1676CPW Microsemi Integrated Products Division LX1676 RODUCTION ATA HEET High Current Biphase Operation Outputs As Low As 0.925V TM † ...

Page 2

Supply Input Voltage (VCCL, VCC)................................................-0.3V to 6.0V Battery Input Voltage (VIN) ..............................................................-0.3V to 24V Current Limit Sense ...

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TM Name FB+ Differential Amplifier Positive Input – Feedback from output FB- Differential Amplifier Negative Input – Feedback from output DFOUT Differential Amplifier Output EA1- Phase 1 Error Amplifier Negative Input EO1 Phase 1 Error Amplifier Output GND Analog Ground ...

Page 4

TM Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C otherwise noted and the following test conditions: VCC = 5V, VCCL = 5V, VIN = 12V, Switching Frequency = 500KHz. Parameter REGULATOR IC Supply Current Low ...

Page 5

Unless otherwise specified, ...

Page 6

Unless otherwise specified, ...

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TM Diff Amp - DACOUT 50µA DAC VID0 DACOUT - 30mV VID1 VID2 DACOUT 0.85 VID3 VID4 2.35 Band- gap VCC VIN PWGD PGOOD DACOUT VIN V AMP IN ROSC FRQ 0° OSC 180° VCC PGN ...

Page 8

TM C2 4700pF CORE FB- CORE FB FB- R6 4.02K 2 DFOUT R7 100K 3 EO1 +5VP 4 EA1 0.22µF DACOUT C4 6 4700pF PWRGD Q1 7 GND C7 10µF NDS7002A 25V 8 VIN ...

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ENERAL ESCRIPTION The LX1676 is a voltage-mode pulse-width modulation controller integrated circuit. The PWM frequency is programmable from 200kHz to 1MHz. The device has external compensation, for more flexibility of the loop response. The LX1676 also makes ...

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VER URRENT ROTECTION The hysteretic phase has ...

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HEORY OF PERATION FOR ...

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OOP AIN UTOMATIC COMPENSATION The PWM ramp shown ...

Page 13

UTPUT NDUCTOR The output inductor should be selected to meet the requirements of the output voltage ripple in steady-state operation and the inductor current slew-rate during transient. The peak-to-peak output voltage ripple is: V ESR = × ...

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OFT TART APACITOR An external soft-start capacitor is connected to the DACOUT pin and will be charged, or discharged linear rate by the internal 50uA bi-directional current source after the UVLO circuit has been ...

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TM PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not ...

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