General Description

The MAX8566 high-efficiency switching regulator deliv-

ers up to 10A load current at output voltages from 0.6V

supplies, making it ideal for point-of-load applications.

The total output-voltage set error is less than ±1% over

load, line, and temperature.

The MAX8566 operates in pulse-width-modulation

(PWM) mode with a 250kHz to 2.4MHz switching fre-

quency range that is programmable by an external

resistor. The IC can be synchronized to an external

clock in the same frequency range using the SYNC

input. The high operating frequency minimizes the size

MOSFETs for both high- and low-side switches main-

tains high efficiency at both heavy-load and high-

switching frequencies.

The MAX8566 employs a voltage-mode control archi-

tecture with a high-bandwidth (> 10MHz) error amplifi-

er. The voltage-mode control architecture makes

switching frequencies greater than 1MHz possible,

achieving all-ceramic-capacitor designs to minimize PC

board space. The error amplifier works with Type 3

compensation to fully utilize the bandwidth of the high-

frequency switching to obtain fast transient response.

Adjustable soft-start time provides flexibility to minimize

input startup inrush current. An open-drain, power-

good (PWRGD) signal goes high when the output

reaches 90% of its regulation point.

The MAX8566 provides a SYNCOUT output to synchro-

nize a second MAX8566 or a second regulator switch-

ing 180° out-of-phase with the first to reduce the input

ripple current, which consequently reduces the input-

capacitance requirements. The MAX8566 also pro-

vides an external reference input (REFIN) for

output-tracking applications.

The MAX8566 is available in a 32-pin, 5mm x 5mm thin

QFN package. The MAX8566 and all the required exter-

Applications

ASIC/CPU/DSP Core Voltages

POL Power Supplies

DDR Power Supplies

Base-Station Power Supplies

Fiber Power Supplies

Telecom Power Supplies

Network Power Supplies

Features

♦ Internal 8mΩ On-Resistance MOSFETs

♦ 10A Output PWM Step-Down Regulator

♦ ±1% Output Accuracy over Load, Line, and

Temperature

♦ Operates from 2.3V to 3.6V Input Supply

♦ 250kHz to 2.4MHz Adjustable Frequency or SYNC

Input

♦ Allows All-Ceramic-Capacitor Design

♦ SYNCOUT Drives 2nd Regulator 180° Out-of-Phase

♦ Prebiased or Monotonic Soft-Start

♦ Programmable Soft-Start Time

♦ Output Tracking or Sequencing

♦ Sourcing and Sinking Output Current

♦ Power-Good Output

♦ 32-Lead Thin QFN Package

♦ REFIN for DDR-Termination Application

High-Efficiency, 10A, PWM

Internal-Switch Step-Down Regulator

________________________________________________________________ Maxim Integrated Products

1

MAX8566ETJ+

STEP-DOWN REGULATOR

TQFN 5mm x 5mm

SS

REFIN

EN

SYNC

FREQ

SYNCOUT

GND

FB

PGND

PGND

PGND

PGND

LX

LX

LX

LX

POWER-GOOD

OUTPUT

MONOTONIC SS

SELECTION

PROGRAMMABLE

FREQUENCY

SYNC INPUT

SYSTEM

ENABLE

SYNC OUTPUT 180

°

REFIN FOR

TRACKING

INPUT

2.25V TO 3.6V

OUTPUT

UP TO 10A

L1

330nH/10A

C5

2 x 22

µF

6.3V

COMPENSATION

Typical Operating Circuit

Ordering Information

19-3690; Rev 0; 6/05

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.

EVALUATION

KIT

AVAILABLE

Pin Configuration appears at end of data sheet.

PART

TEMP RANGE

PIN-PACKAGE

MAX8566ETJ+

-40°C to +85°C

32 Thin QFN 5mm x 5mm

(T3255-4)

+Denotes lead-free package.