General Description

The MAX6469–MAX6484 are low-dropout linear regula-

tors with a fully integrated microprocessor reset circuit.

Each is available with preset output voltages from +1.5V

to +3.3V in 100mV increments and delivers up to 300mA

of load current. These devices consume only 82µA of

supply current. The low supply current, low dropout volt-

age, and integrated reset functionality make these

devices ideal for battery-powered portable equipment.

The MAX6469–MAX6484 include a reset output that indi-

cates when the regulator output drops below standard

microprocessor supply tolerances (-7.5% or -12.5% of

nominal output voltage). This eliminates the need for an

external microprocessor supervisor, while ensuring that

supply voltages and clock oscillators have stabilized

before processor activity is enabled. Push-pull and open-

drain active-low reset outputs are available, with reset

timeout periods of 2.5ms, 20ms, 150ms, or 1200ms (min).

The MAX6469/MAX6470/MAX6473–MAX6478/MAX6481–

MAX6484 also have a shutdown feature that reduces the

supply current to 0.1µA (typ). The MAX6471–MAX6474/

MAX6479–MAX6482 offer a manual reset input to assert a

microprocessor reset while the regulator output is within

specification. The MAX6475/MAX6476/MAX6483/

MAX6484 feature a remote feedback sense pin for use

with an external NPN transistor for higher-current applica-

tions. The MAX6469–MAX6476 are available in 6-pin

SOT23 and 8-pin thin QFN packages. The MAX6477–

MAX6484 are available in a 3

× 3 chip-scale package

(UCSP™). All devices are specified for operation from

-40°C to +85°C.

Applications

Hand-Held Instruments (PDAs, Palmtops)

PCMCIA Cards/USB Devices

Cellular/Cordless Telephones

CD/DVD Drives

Notebook Computers

Digital Cameras

Bluetooth Modules/Wireless LAN

Features

o Preset +1.5V to +3.3V Output (100mV Increments)

o SET Pin for Adjustable Output Voltage

(MAX6477–MAX6484)

o ±2.0% Accuracy Over Temperature

o Guaranteed 300mA Output Current

o Low Dropout Voltage

55mV at 150mA

114mV at 300mA

o 82µA Supply Current, 0.1µA Shutdown Current

o Input Reverse Current, Thermal and Short-Circuit

Protection

o Microprocessor Reset with Four Timeout Options

o Push-Pull or Open-Drain RESET

o Manual Reset Input

o Remote Feedback Sense

300mA LDO Linear Regulators with

Internal Microprocessor Reset Circuit

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

19-2532; Rev 2; 6/03

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

MAX6469UT_ _ _D_-T

-40°C to +85°C

6 SOT23-6

MAX6469TA_ _ _D_*

-40°C to +85°C

8 Thin QFN

MAX6470UT_ _ _D_-T

-40°C to +85°C

6 SOT23-6

MAX6470TA_ _ _D_*

-40°C to +85°C

8 Thin QFN

Note: The first “_ _”are placeholders for the output voltage levels

of the devices. Desired output voltages are set by the suffix found

in the Output Voltage Suffix Guide (Table 1). The third “_” is a

placeholder for the reset threshold accuracy. Desired reset

threshold accuracy is set by the suffix found in the Reset

Threshold Accuracy Guide (Table 2). The “_” following the D is a

placeholder for the reset timeout delay time. Desired reset timeout

delay time is set by the suffix found in the Reset Timeout Delay

Guide (Table 3). For example, the MAX6481BL30BD4-T has a

3.0V output voltage, 12.5% reset threshold tolerance, and a

1200ms (min) reset timeout delay. Sample stock is generally avail-

able on standard versions only (Table 4). Standard versions

require a minimum order increment of 2.5k units. Nonstandard

versions must be ordered in 10k-unit increments. Contact factory

for availability.

Ordering Information continued at end of data sheet.

Pin Configurations appear at end of data sheet.

Typical Operating Circuits appear at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

*Future product—contact factory for availability.

EVALUATION

KIT

AVAILABLE