General Description

The MAX1674/MAX1675/MAX1676 compact, high-effi-

ciency, step-up DC-DC converters fit in small µMAX

packages. They feature a built-in synchronous rectifier,

which improves efficiency and reduces size and cost

by eliminating the need for an external Schottky diode.

Quiescent supply current is only 16µA.

teed from 1.1V inputs. The MAX1674/MAX1675/

MAX1676 have a preset, pin-selectable output for 5V or

3.3V. The outputs can also be adjusted to other volt-

ages using two external resistors.

All three devices have a 0.3

Ω N-channel MOSFET

power switch. The MAX1674 has a 1A current limit. The

MAX1675 has a 0.5A current limit, which permits the

use of a smaller inductor. The MAX1676 comes in a

10-pin µMAX package and features an adjustable cur-

rent limit and circuitry to reduce inductor ringing.

________________________Applications

Pagers

Wireless Phones

Medical Devices

Hand-Held Computers

PDAs

RF Tags

1 to 3-Cell Hand-Held Devices

____________________________Features

o 94% Efficient at 200mA Output Current

o 16µA Quiescent Supply Current

o Internal Synchronous Rectifier (no external diode)

o 0.1µA Logic-Controlled Shutdown

o LBI/LBO Low-Battery Detector

o Selectable Current Limit for Reduced Ripple

o Low-Noise, Anti-Ringing Feature (MAX1676)

o 8-Pin and 10-Pin µMAX Packages

o Preassembled Evaluation Kit (MAX1676EVKIT)

High-Efficiency, Low-Supply-Current,

Compact, Step-Up DC-DC Converters

________________________________________________________________ Maxim Integrated Products

1

GND

LBO

SHDN

REF

1

2

8

7

OUT

LX

LBI

FB

MAX1674

MAX1675

µMAX

TOP VIEW

3

4

6

5

1

2

3

4

5

10

9

8

7

6

OUT

LX

GND

BATT

CLSEL

LBO

LBI

FB

MAX1676

µMAX

SHDN

REF

MAX1674

MAX1675

INPUT

SHDN

LX

LBO

OUT

LBI

0.1

µF

LOW-BATTERY

DETECT OUT

OFF

ON

REF

GND

FB

OUTPUT

3.3V, 5V, OR

ADJ (2V TO 5.5V)

UP TO 300mA

LOW-BATTERY

DETECT IN

PART

MAX1674EUA

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

8 µMAX

_______________Ordering Information

MAX1675EUA

-40°C to +85°C

8 µMAX

MAX1676EUB

-40°C to +85°C

10 µMAX

EVALUATION

KIT MANUAL

FOLLOWS

DATA

SHEET

Typical Operating Circuit

Pin Configurations

19-1360; Rev 3; 3/00

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.