_______________General Description

The MAX1658/MAX1659 linear regulators maximize bat-

tery life by combining ultra-low supply currents and low

dropout voltages. They feature Dual Mode™ operation,

which presets the output to 3.3V (MAX1658) or 5V

(MAX1659), or permits it to be adjusted between 1.25V

and 16V. The regulator supplies up to 350mA, with a

typical dropout of 650mV for the MAX1658 and 490mV

for the MAX1659. With their P-channel MOSFET pass

transistor, these devices maintain a low quiescent cur-

rent from zero output current to the full 350mA, even in

dropout. They support input voltages ranging from 2.7V

to 16.5V.

The MAX1658/MAX1659 feature a 1µA shutdown mode,

reverse battery protection, short-circuit protection, and

thermal shutdown. They are available in a special high-

power (1.2W), 8-pin SO package designed specifically

for compact applications.

________________________Applications

Digital Cordless Phones

PCS Phones

Cellular Phones

PCMCIA Cards

Modems

Hand-Held Instruments

Palmtop Computers

Electronic Planners

____________________________Features

o Wide Input Voltage Range: 2.7V to 16.5V

o Low, 490mV Dropout at 350mA Output Current

(MAX1659)

o 30µA Supply Current

o 1µA Max Shutdown Current

o High-Power (1.2W) 8-Pin SO Package

o Dual Mode Operation Output:

Fixed 3.3V (MAX1658)

Fixed 5.0V (MAX1659)

or Adjustable (1.25V to 16V)

o Thermal Overload Protection

o Current-Limit Protection

o Reverse Battery Protection

350mA, 16.5V Input,

Low-Dropout Linear Regulators

________________________________________________________________

Maxim Integrated Products

1

IN

OUT

OUT

1

2

8

7

GND

IN

SHDN

IN

SET

SO

TOP VIEW

3

4

6

5

MAX1658

MAX1659

__________________Pin Configuration

MAX1658

MAX1659

IN

SHDN

OFF

ON

INPUT

UP TO 16.5V

OUTPUT

3.3V OR 5V,

OR ADJ. (DOWN TO 1.25V);

UP TO 350mA

GND

SET

OUT

__________Typical Operating Circuit

19-1263; Rev 0; 7/97

PART

MAX1658C/D

MAX1659C/D

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

Dice*

Dice*

______________Ordering Information

Dual Mode is a trademark of Maxim Integrated Products.

MAX1658ESA

-40°C to +85°C

8 SO

MAX1659ESA

-40°C to +85°C

8 SO

*

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.