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MAX6469TA33AD3

300mA LDO Linear Regulators with Internal Microprocessor Reset Circuit

Maxim Integrated 

19-2532; Rev 6; 2/11

EVAALVUAAILTAIOBNLEKIT

300mA LDO Linear Regulators with

Internal Microprocessor Reset Circuit

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 TDFN 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

Handheld Instruments (PDAs, Palmtops)

PCMCIA Cards/USB Devices

Cellular/Cordless Telephones

CD/DVD Drives

Notebook Computers

Digital Cameras

Bluetooth Modules/Wireless LAN

UCSP is a trademark of Maxim Integrated Products, Inc.

Pin Configurations appear at end of data sheet.

Typical Operating Circuits appear at end of data sheet.

Features

o 3  3 UCSP, 6-Pin SOT23, and 8-Pin TDFN

Packages

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

o SET Pin for Adjustable Output Voltage

o 75µVRMS LDO Output Voltage Noise

(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

Ordering Information

PART*

TEMP RANGE

PIN-

PACKAGE

MAX6469UT_ _ _D_-T

MAX6469TA_ _ _D_-T**

MAX6470UT_ _ _D_-T

MAX6470TA_ _ _D_-T**

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

6 SOT23-6

8 TDFN-EP***

6 SOT23-6

8 TDFN-EP***

Ordering Information continued at end of data sheet.

*Devices are also available in a lead(Pb)-free/RoHS-compliant

packages. Specify lead(Pb)-free by substituting a +T instead of

a -T when ordering.

**Future product—contact factory for availability.

***EP = Exposed pad.

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

els 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 available on standard versions only

(Table 4). Standard versions require a minimum order incre-

ment of 2.5k units. Nonstandard versions must be ordered in

10k-unit increments. Contact factory for availability.

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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