General Description

The MAX8530/MAX8531 offer the benefits of low-

dropout voltage and ultra-low power regulation in

subminiaturized UCSP and QFN packages with an inte-

grated microprocessor reset circuit (MAX8530 only).

The devices operate from a 2.5V to 6.5V input and

deliver up to 200mA and 150mA outputs with low

dropout of 100mV (typ) at 100mA. Designed with an

internal P-channel MOSFET pass transistor, the supply

current is kept at a low 130µA (with both LDOs on),

independent of the load current and dropout voltage.

Other features include short-circuit protection and

thermal-shutdown protection.

The MAX8530 provides microprocessor open-drain,

active-low reset output to monitor OUT1, eliminating

external components and adjustments. The MAX8530

asserts a 100ms (min) RESET signal when OUT1 drops

below 87% of the nominal output voltage. The MAX8531

includes a reference bypass pin for low output noise

Both devices include a logic-controlled shutdown input

and are available in 6-bump UCSP and 6-pin thin QFN

exposed pad packages.

Applications

Cellular and Cordless Phones

PDAs and Palmtop Computers

Notebook Computers

Digital Cameras

PCMCIA Cards

Wireless LAN Cards

Hand-Held Instruments

Features

o Guaranteed 200mA Output Current for OUT1

o Guaranteed 150mA Output Current for OUT2

o Low 100mV (typ) Dropout at 100mA Load for

both LDOs

o Open-Drain, Active-Low 100ms (min) Reset Timer

(MAX8530)

o Low 130µA Operating Supply Current

o <1µA Shutdown Current

o Thermal-Overload and Short-Circuit Protection

o Output Current Limit

o Tiny Packages Available

1.16 x 1.57 x 0.6mm UCSP (3 x 2 Grid)

3mm x 3mm Thin QFN

Dual Low-Dropout Linear Regulators

Ordering Information

19-2711; Rev 0; 1/03

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.

*xy = Output voltage code (see the Output Voltage Selector

Guide).

**EP = Exposed pad.

EVALUATION

KIT

AVAILABLE

Pin Configurations appear at end of data sheet.

Output Voltage Selector Guide appears at end of data

sheet.

PART

TEMP RANGE

OUT_

VOLTAGE

PIN-

PACKAGE

MAX8530EBTxy* -40

°C to +85°C 1.5V to 3.3V 6 UCSP

MAX8530ETTxy* -40

°C to +85°C 1.5V to 3.3V 6 Thin QFN-EP**

MAX8531EBTxy* -40

°C to +85°C 1.5V to 3.3V 6 UCSP

MAX8531ETTxy* -40

°C to +85°C 1.5V to 3.3V 6 Thin QFN-EP

IN

OUT1

2.2

µF

2.2

µF

INPUT

2.5V TO 6.5V

1.5V TO 3.3V

AT 200mA

1.5V TO 3.3V

AT 150mA

1

µF

SHDN

OFF

ON

OUT2

GND

RESET

BASEBAND

µP

RESET

MAX8530

Typical Operating Circuit