General Description

The MAX1963/MAX1976 low-dropout linear regulators

operate from a +1.62V to +3.6V supply and deliver a

guaranteed 300mA continuous load current with a low

100mV dropout. The high-accuracy (±0.5%) output

voltage is preset to an internally trimmed voltage in the

+0.75V to +3.0V range. An active-low, open-drain reset

output remains asserted for at least 2.2ms (MAX1963)

or 70ms (MAX1976) after the output voltage reaches

regulation. These devices are offered in 6-pin thin

SOT23 and 6-pin 3mm x 3mm thin DFN packages.

An internal PMOS pass transistor allows the low supply

current to remain independent of load and dropout volt-

age, making these devices ideal for portable battery-pow-

ered equipment such as personal digital assistants

(PDAs), cell phones, cordless phones, and notebook com-

puters. Other features include logic-controlled shutdown,

short-circuit protection, and thermal-overload protection.

Applications

Notebook Computers

Cellular and PCS Telephones

Personal Digital Assistants (PDAs)

Hand-Held Computers

Digital Cameras

PCMCIA Cards

CD and MP3 Players

Features

♦ Low 1.62V Minimum Input Voltage

♦ Guaranteed 300mA Output Current

♦ ±2.5% Accuracy Over Load/Line/Temp

♦ Low 100mV Dropout at 300mA Load

♦ 2.2ms (MAX1963) or 70ms (MAX1976)

RESET Output Flag

♦ Supply Current Independent of Load and

Dropout Voltage

♦ Logic-Controlled Shutdown

♦ Thermal-Overload and Short-Circuit Protection

♦ Preset Output Voltages (0.75V to 3.0V)

♦ Tiny 6-Pin Thin SOT23 Package (<1.1mm High)

♦ Thin 6-Pin TDFN Package (<0.8mm High)

Low-Input-Voltage, 300mA LDO Regulators

with

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-3040; Rev 2; 5/07

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.

PART*

TEMP RANGE PIN-PACKAGE

PKG

CODE

MAX1963EZT_ _ _-T -40°C to +85°C 6 Thin SOT23-6

Z6-1

MAX1963ETT_ _ _-T -40°C to +85°C 6 TDFN

T633-2

MAX1976EZT_ _ _-T -40°C to +85°C 6 Thin SOT23-6

Z6-1

MAX1976ETT_ _ _-T -40°C to +85°C 6 TDFN

T633-2

TOP VIEW

TDFN

3mm x 3mm

I.C.

OUT

RESET

GND

IN

SHDN

1

2

3

6

5

4

MAX1963

MAX1976

GND

RESET

SHDN

1

IN

MAX1963

MAX1976

THIN SOT23

2

3

4

I.C.

5

Pin Configurations

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

the blanks to complete the part number. Contact the factory for

other output voltages.

Selector Guide appears at end of data sheet.

MAX1963

MAX1976

INPUT

1.62V TO 3.6V

4.7

μF

ON

OFF

IN

1

μF

300mA

SHDN

GND

OUTPUT

0.75V TO 3.0V

LOGIC

SUPPLY

100k

Ω

TO

μC

OUT

RESET

Typical Operating Circuit