SC2647 Semtech Corporation, SC2647 Datasheet

SC2647

Manufacturer Part Number

SC2647

Description

Multi-Platform Multi-Phase PWM Controller

Manufacturer

Semtech Corporation

Datasheet

1.SC2647.pdf (11 pages)

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The SC2647 provides microprocessor core voltage

regulation solution up to 4 paralleled PWM channels. The

solution can also be configured as 2, 3, or 4-phase form.

Multi-phase buck regulator utilizes the phase-shift tim-

ing control to allow interleaved switching of the power

switches. This architecture minimizes the core voltage

ripple and the input current ripple, which leads to opti-

mized voltage regulator design for power density, tran-

sient responses, and the thermal performances.

To satisfy the highly dynamic nature of the modern

microprocessors, the SC2647 adopts peak current mode

control topology which ensures wide control loop

bandwidth and fast transient responses. The current

mode control provides intrinsic phase current matching.

The maximum ripple frequency is greater than 1MHz.

One of the outstanding features of the SC2647 is its

voltage regulation accuracy. Not only it provides better

than 0.5% set point accuracy, but also the accuracy to

fully complaint with the stringent load line slope

specifications mandated by the modern microprocessors.

Lossless output current sensing ensures the regulator

output voltage is accurately positioned according to the

load current condition, and an internal temperature

compensation technology further enhances the perfor-

mance of voltage accuracy.

The patented Combi-Sense

SC2647. The MOSFET R

winding resistance is used to generate the phase cur-

rent information. The SC1211VX Combi-Sense

driver plus the SC2647 enables the complete solution.

The SC2647 is a multi-platform controller. It conforms

to Intel VRM/VRD10.0, VRM9.X, and AMD K-8 (Opteron

VID specifications. With very minor changes of the sche-

matic and the layout, the SC2647 based solution can be

ported form one platform to another. This greatly ben-

efits the system manufactures for reductions of design

cycle and minimize the inventory management.

July, 12, 2006

POWER MANAGEMENT

Description

ds(on)

topology is employed by

and the output inductor

MOSFET

)

The VID structure of the SC2647 supports VID-on-Fly ap-

plications for any platform. The cycle-by-cycle current

limit plus the intelligent over current shut down provide

the maximum versatility of the system without false

tripping under all possible changes of VID and load

conditions. The differential voltage feedback sense

eliminates the error caused by high load current on the

ground plane. External offset is easy to achieve for any

platforms and the VID settings. The enable function is

also provided to interface with the corresponding sys-

tem signal for correct start up timing and shut down

timing.

(Multiple Patents Pending)

Features

Applications

This device is fully WEEE and RoHS Compliant

VRD/VRM10.0, VRM9.X, and K-8 compliant

Core Voltage Set Point Accuracy 0.5%

Combi-Sense

Intrinsic Phase Current Matching

Fast Transient Responses

Active Droop with Temperature Compensation to

Meet Load Line Slope

Support VID-on-Fly with 5 or 6 bit VID

Enable Function for Power Sequencing

Cycle-by-Cycle Peak Current Limit

Intelligent Over Current Shut Down

Over Voltage Protection When Using Semtech

Under Voltage Protection Built in

External programmable Soft-Start

Externally programmable switching frequency.

2, 3, or 4-Phase Configurations

24-Pin SOIC or TSSOP Packages

Voltage Regulator VRD/VRM10.0

Voltage Regulator VRM9.X

Voltage Regulator K-8

High Current, Low Voltage Step Down DC/DC

Converters

Combi-Sense

Multi-Phase PWM Controller

Current Mode Control

Driver/1211VX

Multi-Platform

www.semtech.com

SC2647

Related parts for SC2647

SC2647 Summary of contents

Page 1

... The SC2647 is a multi-platform controller. It conforms to Intel VRM/VRD10.0, VRM9.X, and AMD K-8 (Opteron VID specifications. With very minor changes of the sche- matic and the layout, the SC2647 based solution can be ported form one platform to another. This greatly ben- efits the system manufactures for reductions of design cycle and minimize the inventory management ...

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... SC2647 Units μA μ ...

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... SC2647 μ ...

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... SC2647 www.semtech.com ...

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... VBG 6 DRV1 DRV2 DRV3 DRV4 OUT 3 PHASE SELECT - 0 PWR_GOOD + OUT Power Good Threshold - ERROUT OCP & SHUTDOWM UVLO & LATCH BGOUT SC2647 19 OUT1 20 OUT2 21 OUT3 22 OUT4 3/4 Phase selection Threshold 16 PWRGD 0 5 ERROUT 9 VCC 18 AGND www.semtech.com ...

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SC2647 Semtech Corporation, SC2647 Datasheet

SC2647

Related parts for SC2647

SC2647 Summary of contents

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