General Description

The MAX1963A/MAX1976A low-dropout linear regula-

tors 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 (MAX1963A)

or 70ms (MAX1976A) after the output voltage reaches

regulation. These devices are offered in thin SOT23 and

thin DFN packages. An internal pMOS pass transistor

allows the low supply current to remain independent of

load and dropout voltage, making these devices ideal for

portable battery-powered equipment.

Applications

Notebook/Handheld Computers

Cellular/Smart/PDA Phones

DSC, CD/MP3 Players

PCMCIA Cards

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 (MAX1963A) or 70ms (MAX1976A)

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)

♦ TDFN Package (<0.8mm High)

Low-Input-Voltage, 300mA LDO Regulators

with

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-3684; Rev 0; 5/05

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.

PART*

TEMP RANGE

PIN-PACKAGE

MAX1963AEZT_ _ _-T

-40°C to +85°C 6 Thin SOT23-6

MAX1963AETT_ _ _-T

-40°C to +85°C 6 TDFN-6 3mm x 3mm

MAX1963AETA_ _ _-T

-40°C to +85°C 8 TDFN-8 2mm x 2mm

MAX1976AEZT_ _ _-T

-40°C to +85°C 6 Thin SOT23-6

MAX1976AETT_ _ _-T

-40°C to +85°C 6 TDFN-6 3mm x 3mm

MAX1976AETA_ _ _-T

-40°C to +85°C 8 TDFN-8 2mm x 2mm

TOP VIEW

TDFN

3mm x 3mm

12

3

65

4

MAX1963A

MAX1976A

GND

RESET

SHDN

1

IN

MAX1963A

MAX1976A

THIN SOT23

2

3

4

I.C.

5

TDFN

2mm x 2mm

12

3

4

87

6

5

MAX1963A

MAX1976A

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.

MAX1963A

MAX1976A

INPUT

1.62V TO 3.6V

4.7

µF

ON

OFF

IN

1

µF

UP TO

300mA

SHDN

GND

OUTPUT

0.75V TO 3.0V

LOGIC

SUPPLY

100k

Ω

TO

µC

OUT

RESET

Typical Operating Circuit