General Description

The MAX8840/MAX8841/MAX8842 ultra-low-noise, low-

dropout (LDO) linear regulators are designed to deliver

up to 150mA continuous output current. These regula-

tors achieve a low 120mV dropout for 120mA load cur-

rent. The MAX8840 uses an advanced architecture to

PSRR of 54dB at 100kHz.

The MAX8841 does not require a bypass capacitor,

hence achieving the smallest PC board area. The

MAX8842 output voltage can be adjusted with an exter-

nal divider.

The MAX8840/MAX8841 are preset to a variety of volt-

ages in the 1.5V to 4.5V range. Designed with a p-channel

MOSFET series pass transistor, the MAX8840/MAX8841/

MAX8842 maintain very low ground current (40µA).

The regulators are designed and optimized to work with

low-value, low-cost ceramic capacitors. The MAX8840

requires only 1µF (typ) of output capacitance for stability

with any load. When disabled, current consumption drops

to below 1µA.

The MAX8840/MAX8841/MAX8842 are available in a tiny

1mm x 1.5mm x 0.8mm µDFN.

Applications

Cellular and Cordless Phones

PDA and Palmtop Computers

Base Stations

Bluetooth Portable Radios and Accessories

Wireless LANs

Digital Cameras

Personal Stereos

Portable and Battery-Powered Equipment

Features

♦ Space-Saving 1.0mm x 1.5mm x 0.8mm µDFN

Bandwidth (MAX8840)

♦ 78dB PSRR at 1kHz (MAX8840)

♦ 120mV Dropout at 120mA Load

♦ Stable with 1µF Ceramic Capacitor for Any Load

♦ Guaranteed 150mA Output

♦ Only Need Input and Output Capacitors (MAX8841)

♦ Output Voltages: 1.5V, 1.8V, 2.5V, 2.6V, 2.7V, 2.8V,

2.85V, 3V, 3.3V, 4.5V (MAX8840/MAX8841) and

Adjustable (MAX8842)

♦ Low 40µA Ground Current

♦ Excellent Load/Line Transient

♦ Overcurrent and Thermal Protection

Ultra-Low-Noise, High PSRR, Low-Dropout,

150mA Linear Regulators in µDFN

________________________________________________________________ Maxim Integrated Products

1

μDFN

(1.5mm x 1.0mm)

TOP VIEW

GND

BP (MAX8840)

N.C. (MAX8841)

FB (MAX8842)

SHDN

1

2

3

6

4

OUT

IN

MAX8840

MAX8841

MAX8842

Pin Configuration

Ordering Information

MAX8840

OUTPUT PRESET

1 5V TO 4 5V

IN

INPUT

2V TO 6V

OFF

SHDN

10nF

1

μF

1

μF

OUT

ON

BP

GND

Typical Operating Circuits

19-0629; Rev 0; 10/06

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 is the output voltage code (see the Output Voltage Selector

Guide). Other versions between 1.5V and 4.5V are available in

100mV increments. Contact factory for other versions.

**Future product—contact factory for availability.

+Denotes lead-free package.

PART*

TEMP RANGE

PIN-PACKAGE

MAX8840ELTxy+T

-40°C to +85°C

6 µDFN-6

1.5mm x 1.0mm

MAX8841ELTxy+T**

-40°C to +85°C

6 µDFN-6

1.5mm x 1.0mm

MAX8842ELT+T**

-40°C to +85°C

6 µDFN-6

1.5mm x 1.0mm

Typical Operating Circuits continued at end of data sheet.

Output Voltage Selector Guide appears at end of data sheet.