For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

General Description

The MAX1792 low-dropout linear regulator operates

from a +2.5V to +5.5V supply and delivers a guaran-

teed 500mA load current with low 130mV dropout. The

high-accuracy (±1%) output voltage is preset at an

internally trimmed voltage (see Selector Guide) or can

be adjusted from 1.25V to 5.0V with an external resis-

tive divider.

An internal PMOS pass transistor allows the low 80µA

supply current to remain independent of load, making

this device ideal for portable battery-operated equip-

ment such as personal digital assistants (PDAs), cellu-

lar phones, cordless phones, base stations, and

notebook computers.

Other features include an active-low open-drain reset

output with a 4ms timeout period that indicates when

the output is out of regulation, a 0.1µA shutdown mode,

short-circuit protection, and thermal shutdown protec-

tion. The device is available in a miniature 1.3W, 8-pin

power-µMAX package with a metal pad on the under-

side of the package.

________________________Applications

Notebook Computers

Cellular and Cordless Telephones

Personal Digital Assistants (PDAs)

Palmtop Computers

Base Stations

USB Hubs

Docking Stations

Features

o Guaranteed 500mA Output Current

o Low 130mV Dropout at 500mA

o Up to ±1% Output Voltage Accuracy

Preset at 1.5V, 1.8V, 2.5V, 3.3V, or 5.0V

Adjustable from 1.25V to 5.0V

o Reset Output with 4ms Timeout Period

o Low 80µA Ground Current

o 0.1µA Shutdown Current

o Thermal Overload Protection

o Output Current Limit

o Tiny 1.3W Power-µMAX Package

500mA Low-Dropout

Linear Regulator in µMAX

________________________________________________________________ Maxim Integrated Products

1

SET

GND

SHDN

1

2

8

7

OUT

OUT

IN

RST

IN

POWER-

µMAX

TOP VIEW

3

4

6

5

MAX1792

Pin Configuration

NC

MAX1792

IN

IN

1

µF

3.3

µF

100k

ON

OFF

SHDN

OUT

OUT

RST

GND

SET

TO

µC

Typical Operating Circuit

19-1699; Rev 0; 9/00

Ordering Information

Selector Guide

PART AND

SUFFIX

µMAX

TOP MARK

MAX1792EUA15

1.5V or Adj.

AAAE

MAX1792EUA18

1.8V or Adj.

AAAA

MAX1792EUA25

2.5V or Adj.

AAAB

MAX1792EUA33

3.3V or Adj.

AAAC

MAX1792EUA50

5.0V or Adj.

AAAD

PART*

TEMP RANGE

PIN-PACKAGE

MAX1792EUA_ _

-40

°C to +85°C

8 Power-

µMAX

*Insert the desired two-digit suffix (see Selector Guide) into the

blanks to complete the part number.

Contact factory for other preset output voltages.