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MAX1735

200mA, Negative-Output, Low-Dropout Linear Regulator in SOT23

Maxim Integrated 

19-1783; Rev 1; 11/03

200mA, Negative-Output, Low-Dropout

Linear Regulator in SOT23

General Description

The MAX1735 negative-output, low-dropout linear regu-

lator operates from a -2.5V to -6.5V input and delivers a

guaranteed 200mA with a low 80mV dropout. The high-

accuracy (±1%) output voltage is preset or can be

adjusted from -1.25V to -5.5V with an external resistive

voltage-divider.

An internal N-channel MOSFET allows for a low 85µA

quiescent current virtually independent of the load,

making this device ideal for battery-powered portable

equipment, such as PDAs, mobile phones, cordless

phones, and wireless data modems.

The device is available in several preset output voltage

versions: -5.0V, -3.0V, and -2.5V. All versions offer a

1nA low-power shutdown mode, short-circuit protec-

tion, and thermal overload protection. The device is

offered in a tiny 5-pin SOT23 package.

Applications

Disk Drives

Modems

Instrumentation Amplifiers

Notebook Computers

Mobile and Cordless Telephones

PCMCIA Cards

GaAsFET Bias

Mobile Wireless Data Modems

PDAs and Palmtop Computers

Features

♦ Guaranteed 200mA Output Current

♦ Low 80mV Dropout Voltage at 200mA

♦ Low 85µA Quiescent Supply Current

♦ Low 1nA Current Shutdown Mode

♦ Stable with 1µF COUT

♦ PSRR >60dB at 100Hz

♦ Thermal Overload Protection

♦ Short-Circuit Protection

♦ -5.0V, -3.0V, or -2.5V Output Voltage

or Adjustable (-1.25V to -5.5V)

♦ Tiny SOT23-5 Package

PART

MAX1735EUK50-T

MAX1735EUK30-T

MAX1735EUK25-T

Ordering Information

TEMP RANGE

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

PIN-

PACKAGE

5 SOT23-5

5 SOT23-5

5 SOT23-5

Output-Voltage Selector Guide

PART

MAX1735EUK50-T

MAX1735EUK30-T

MAX1735EUK25-T

PRESET OUTPUT

VOLTAGE

-5.0V or adj

-3.0V or adj

-2.5V or adj

SOT TOP

MARK

ADOZ

ADOY

ADOX

Typical Operating Circuit

-6.5V TO -2.5V

INPUT

IN

CIN

-5V, -3V, OR -2.5V

OUTPUT

UP TO 200mA

OUT

COUT

ON

GND

OFF

ON

MAX1735

SHDN

SET

GND

TOP VIEW

Pin Configuration

GND 1

5 OUT

MAX1735

IN 2

SHDN 3

4 SET

SOT23-5

________________________________________________________________ Maxim Integrated Products 1

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.

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