General Description

The MAX8559 dual, low-noise, low-dropout (LDO) linear

regulator operates from a 2.5V to 6.5V input voltage

and delivers at least 300mA of continuous output cur-

rent. It offers low output noise and low dropout of only

60mV at 100mA. Typical output noise for this device is

an internal P-channel MOSFET pass transistor, the

MAX8559 maintains a low 115µA supply current per

LDO, independent of the load current and dropout volt-

age. Other features include short-circuit protection and

thermal-shutdown protection. The MAX8559 includes

two independent logic-controlled shutdown inputs and

is capable of operating without a bypass capacitor to

further reduce total solution size. The MAX8559 is avail-

able in a miniature 8-bump UCSP (2mm x 1mm) or

8-pin TDFN (3mm x 3mm) package.

Applications

Cellular and Cordless Phones

PDAs and Palmtop Computers

Notebook Computers

Digital Cameras

PCMCIA Cards

Wireless LAN Cards

Hand-Held Instruments

Features

♦ Two Low-Dropout-Voltage Regulators

♦ 300mA Output Current for Each LDO

♦ 70dB PSRR at 10kHz

♦ Independent Shutdown Controls

♦ Low 60mV Dropout at 100mA Load

♦ 115µA Operating Supply Current per LDO

♦ 1.5V to 3.3V Factory-Preset Output

♦ Small Ceramic Output Capacitors

♦ Output Current Limit

♦ Thermal-Overload and Short-Circuit Protection

♦ 1.95W Power-Dissipation Capability (TDFN)

Dual, 300mA, Low-Noise Linear Regulator

with Independent Shutdown in UCSP or TDFN

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

ON

OFF

ON

OFF

MAX8559

INPUT

2.5V TO 6.5V

2.2µF

min

INB

SHDNA

SHDNB

INA

GND

OUTB

OUTA

BP

0.01µF

(OPTIONAL)

2.2µF/150mA

4.7µF/300mA

1.5V TO 3.3V

2.2µF/150mA

4.7µF/300mA

1.5V TO 3.3V

Typical Operating Circuit

19-3121; Rev 0; 1/04

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.

EVALUATION

KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

MAX8559EBAxy*†

-40

°C to +85°C8 UCSP (B8-1)

MAX8559ETAxy*

-40

°C to +85°C8 TDFN-EP**

Selector Guide).

**EP = Exposed pad.

†Future product—contact factory for availability.

Output Voltage Selector Guide appears at end of data sheet.

Pin Configurations

1

2

TDFN

3mm x 3mm

3

4

MAX8559ETA

8

76

5

TOP VIEW

Pin Configurations continued at end of data sheet.