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19-2514; Rev 3; 8/04

Dual-Phase, Parallelable, Average Current-Mode

Controllers

General Description

The MAX5038/MAX5041 dual-phase, PWM controllers

provide high-output-current capability in a compact

package with a minimum number of external compo-

nents. The MAX5038/MAX5041 utilize a dual-phase,

average current-mode control that enables optimal use

of low R

DS(ON)

MOSFETs, eliminating the need for exter-

nal heatsinks even when delivering high output currents.

Differential sensing enables accurate control of the out-

put voltage, while adaptive voltage positioning provides

optimum transient response. An internal regulator

enables operation with input voltage ranges of +4.75V to

+5.5V or +8V to +28V. The high switching frequency, up

to 500kHz per phase, and dual-phase operation allow

the use of low-output inductor values and input capacitor

values. This accommodates the use of PC board-

embedded planar magnetics achieving superior reliabili-

ty, current sharing, thermal management, compact size,

and low system cost.

The MAX5038/MAX5041 also feature a clock input

(CLKIN) for synchronization to an external clock, and a

clock output (CLKOUT) with programmable phase delay

(relative to CLKIN) for paralleling multiple phases. The

MAX5038 offers a variety of factory-trimmed preset output

voltages (see

Selector Guide)

and the MAX5041 offers an

adjustable output voltage from +1.0V to +3.3V.

The MAX5038/MAX5041 operate over the extended

industrial temperature range (-40掳C to +85掳C) and are

available in a 28-pin SSOP package. Refer to the

MAX5037 data sheet for a VRM 9.0-compatible, VID-

controlled output voltage controller in a 44-pin MQFP or

QFN package.

Features

鈾?/div>

+4.75V to +5.5V or +8V to +28V Input Voltage

Range

鈾?/div>

Up to 60A Output Current

鈾?/div>

Internal Voltage Regulator for a +12V or +24V

Power Bus

鈾?/div>

True Differential Remote Output Sensing

鈾?/div>

Two Out-Of-Phase Controllers Reduce Input

Capacitance Requirement and Distribute Power

Dissipation

鈾?/div>

Average Current-Mode Control

Superior Current Sharing Between Individual

Phases and Paralleled Modules

Accurate Current Limit Eliminates MOSFET and

Inductor Derating

鈾?/div>

Integrated 4A Gate Drivers

鈾?/div>

Selectable Fixed Frequency 250kHz or 500kHz Per

Phase (Up to 1MHz for 2 Phases)

鈾?/div>

Fixed (MAX5038) or Adjustable (MAX5041) Output

Voltages

鈾?/div>

0.5% Accurate Reference (MAX5041B)

鈾?/div>

External Frequency Synchronization from 125kHz

to 600kHz

鈾?/div>

Internal PLL with Clock Output for Paralleling

Multiple DC-DC Converters

鈾?/div>

Thermal Protection

鈾?/div>

28-Pin SSOP Package

MAX5038/MAX5041

Applications

Servers and Workstations

Point-Of-Load High-Current/High-Density

Telecom DC-DC Regulators

Networking Systems

Large-Memory Arrays

RAID Systems

High-End Desktop Computers

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

28 SSOP

OUTPUT

VOLTAGE

Fixed +1.2V

Fixed +1.5V

Fixed +1.8V

Fixed +2.5V

Fixed +3.3V

Adj +1.0V to

+3.3V

Adj +1.0V to

+3.3V

MAX5038EAI12

-40掳C to +85掳C

MAX5038EAI15

MAX5038EAI18

MAX5038EAI25

MAX5038EAI33

MAX5041EAI

MAX5041BEAI

-40掳C to +85掳C

Pin Configuration appears at end of data sheet.

________________________________________________________________Maxim

Integrated Products

1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

MAX5041

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