_______________General Description

The MAX866 and MAX867 are ultra-small, high-efficiency,

CMOS, step-up, DC-DC switching regulators for 1-cell

battery-powered systems. The MAX866 accepts a posi-

to a higher, pin-selectable output voltage of 3.3V or 5V.

The MAX867 adjustable version accepts 0.8V to 6.0V

input voltages and generates a higher adjustable output

voltage in the 2.7V to 6.0V range. Typical efficiencies are

greater than 80%. Typical no-load supply current is

100µA (1µA in shutdown).

The MAX866/MAX867 combine ultra-low quiescent sup-

ply current and high efficiency to give maximum battery

life. Its high switching frequency permits the use of

small, low-cost inductors and capacitors. Additionally,

internal peak-current limiting protects the IC.

________________________Applications

Pagers

Remote Controls

Detectors

1-Cell Battery-Operated Equipment

Backup Supplies

____________________________Features

o 0.8V to 6.0V Input Supply Voltage

o 0.9V Guaranteed Start-Up Supply Voltage

o >80% Efficiency Over Wide Load Range

o 1µA Shutdown Mode

o Up to 250kHz Switching Frequency

o ±1.5% Reference Tolerance

o Low-Battery Detector (LBI/LBO)

o Available in Ultra-Small 8-Pin µMAX Package

(1.11mm high)

______________Ordering Information

3.3V/5V or Adjustable-Output,

Single-Cell DC-DC Converters

________________________________________________________________

Maxim Integrated Products

1

1

2

3

4

8

7

6

5

LX

GND

OUT

LBI

LBO

REF

3/5

SHDN

MAX866

SO/µMAX

TOP VIEW

1

2

3

4

8

7

6

5

LX

GND

OUT

LBI

LBO

REF

FB

SHDN

MAX867

SO/µMAX

_________________Pin Configurations

MAX866

SHDN

3/5

REF

LX

GND

OUT

INPUT

MBRS0520LTI

OR 1N5817

OUTPUT

5V OR 3.3V

LBO

47

µF

0.22

µF

330

µH

LOW-BATTERY

DETECTOR OUTPUT

ON/OFF

3V/5V SELECT

LBI

LOW-BATTERY

DETECTOR

INPUT

__________Typical Operating Circuit

19-0374; Rev 1; 5/96

PART

TEMP. RANGE

PIN-PACKAGE

MAX866C/D

0°C to +70°C

Dice*

MAX866ESA

-40°C to +85°C

8 SO

MAX867C/D

0°C to +70°C

Dice*

MAX867ESA

-40°C to +85°C

8 SO

EVALUATION

KIT

AVAILABLE

MAX866EUA

-40°C to +85°C

8 µMAX

MAX867EUA

-40°C to +85°C

8 µMAX

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800