General Description

The MAX5038A/MAX5041A dual-phase, PWM controllers

provide high-output-current capability in a compact

package with a minimum number of external compo-

nents. The MAX5038A/MAX5041A utilize a dual-phase,

average-current-mode control that enables optimal use

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 MAX5038A/MAX5041A 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

MAX5038A/MAX5041A also limit the reverse current in

case the bus voltage becomes higher than the regulat-

ed output voltage. The MAX5038A offers a variety of fac-

tory-trimmed preset output voltages (see Selector Guide)

and the MAX5041A offers an adjustable output voltage

between +1.0V to +3.3V.

The MAX5038A/MAX5041A operate over the extended

temperature range (-40°C to +85°C) and are available

in a 28-pin SSOP package. Refer to the MAX5037A and

MAX5065/MAX5067 data sheets for a VRM 9.0/VRM 9.1-

compatible, VID-controlled, adjustable output voltage

controller in a 44-pin MQFP/thin QFN or 28-pin SSOP

package.

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

Features

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

Range

o Up to 60A Output Current

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

Power Bus

o True Differential Remote Output Sensing

o Two Out-Of-Phase Controllers Reduce Input

Capacitance Requirement and Distribute Power

Dissipation

o Average-Current-Mode Control

Superior Current Sharing Between Individual

Phases and Paralleled Modules

Accurate Current Limit Eliminates MOSFET and

Inductor Derating

o Limits Reverse-Current Sinking in Paralleled

Modules

o Integrated 4A Gate Drivers

o Selectable Fixed Frequency 250kHz or 500kHz per

Phase (Up to 1MHz for Two Phases)

o Fixed (MAX5038A) or Adjustable (MAX5041A)

Output Voltages

o External Frequency Synchronization from 125kHz

to 600kHz

o Internal PLL with Clock Output for Paralleling

Multiple DC-DC Converters

o Thermal Protection

o 28-Pin SSOP Package

Dual-Phase, Parallelable, Average-Current-Mode

Controllers

________________________________________________________________Maxim Integrated Products

1

19-3034; Rev 0; 10/03

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

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

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

OUTPUT

VOLTAGE

(V)

MAX5038AEAI12

-40°C to +85°C

28 SSOP

Fixed +1.2

MAX5038AEAI15

-40°C to +85°C

28 SSOP

Fixed +1.5

MAX5038AEAI18

-40°C to +85°C

28 SSOP

Fixed +1.8

MAX5038AEAI25

-40°C to +85°C

28 SSOP

Fixed +2.5

MAX5038AEAI33

-40°C to +85°C

28 SSOP

Fixed +3.3

MAX5041AEAI

-40°C to +85°C

28 SSOP

Adj +1.0 to

+3.3

Pin Configuration appears at end of data sheet.