General Description

The MAX8620Y micro-power-management integrated

circuit (µPMIC) powers low-voltage microprocessors or

DSPs in portable devices. The µPMIC includes a high-

efficiency step-down DC-DC converter, two low-

dropout linear regulators (LDOs), a microprocessor

reset output, and power-on/off control logic. This device

maintains high efficiency at light loads with a low 115µA

supply current, and its miniature TDFN package makes

it ideal for portable devices.

The MAX8620Y’s step-down DC-DC converter utilizes a

proprietary 4MHz hysteretic-PWM control scheme that

allows for ultra-small external components. Internal syn-

chronous rectification improves efficiency and elimi-

nates the external Schottky diode that is required in

conventional step-down converters. The output voltage

is adjustable from 0.6V to 3.3V, with guaranteed output

current up to 500mA.

noise and a low dropout of only 200mV at 200mA. Each

LDO delivers at least 300mA of continuous output cur-

rent. The output voltages are pin selectable from 1.8V

to 3.3V for flexibility.

A microprocessor reset output (RESET) monitors OUT1

and warns the system of impending power loss allow-

ing safe shutdown. RESET asserts during power-up,

power-down, shutdown, and fault conditions where

Applications

Cellular Handsets

Smart Phones/PDA Phones

PDAs

Wireless LAN

Microprocessor and DSP Solutions including

MSM™, XScale™, ARM™, and OMAP™

Features

♦ Three Regulators and a Reset in One Package

♦ High-Efficiency Step-Down Converter

Up to 4MHz Fixed Switching Frequency

500mA Guaranteed Output Current

0.6V to 3.3V Adjustable Output Voltage

±2% Initial Accuracy

Fast Voltage-Positioning Transient Response

Internal Synchronous Rectifier

♦ Two 300mA LDO Regulators

200mV Dropout at 200mA Load

3% Accuracy over Line, Load, and Temperature

Overcurrent Protection

Nine Pin-Selectable Output-Voltage Settings

♦ 30ms (min) RESET Output Flag

♦ 2.7V to 5.5V Input

♦ 115µA (typ) Supply Current at No Load

♦ Thermal-Overload Protection

♦ Tiny 3mm x 3mm x 0.8mm TDFN Package

µPMIC for Microprocessors or DSPs

in Portable Equipment

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

MAX8620Y

OUT1

100k

Ω

RESET

OUT2

LX

FB

GND

IN2

BP

HF_PWR

PWR_ON

SEL1

RESET

SEL2

EN2

IN1

1.80V, 2.60V, 2.80V, 2.85V,

3.00V, OR 3.30V*

300mA

1.80V, 2.50V, 2.60V,

2.85V, OR 3.00V*

300mA

OUT3

0.6V TO 3.3V

500mA

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX8620YETD

-40°C to +85°C

14 TDFN-EP

(T1433-2)

AAB

Typical Operating Circuit

19-3564; Rev 0; 1/05

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.

MSM is a trademark of QUALCOMM, Inc.

XScale is a trademark of Intel Corp.

ARM is a trademark of ARM Limited.

OMAP is a trademark of Texas Instruments, Inc.

EVALUATION

KIT

AVAILABLE

Pin Configuration appears at end of data sheet.