_______________General Description

The MAX608 low-voltage step-up controller operates

from a 1.8V to 16.5V input voltage range. Pulse-fre-

quency-modulation (PFM) control provides high effi-

ciency at heavy loads, while using only 85µA (typical)

when operating with no load. In addition, a logic-con-

trolled shutdown mode reduces supply current to 2µA

typical. The output voltage is factory-set at 5V or can be

adjusted from 3V to 16.5V with an external resistor

divider.

The MAX608 is ideal for two- and three-cell battery-

powered systems. An operating frequency of up to

300kHz allows use with small surface-mount compo-

nents.

The MAX608 operates in “bootstrapped” mode only

(with the chip supply, OUT, connected to the DC-DC

output). For a 12V output without external resistors, or

for nonbootstrapped applications (chip supply connect-

ed to input voltage), refer to the pin-compatible

MAX1771. The MAX608 is available in 8-pin DIP and

SO packages.

________________________Applications

High-Efficiency DC-DC Converters

Battery-Powered Applications

Positive LCD-Bias Generators

Portable Communicators

____________________________Features

o 1.8V to 16.5V Input Range

o 85% Efficiency for 30mA to 1.5A Load Currents

o Up to 10W Output Power

o 110µA Max Supply Current

o 5µA Max Shutdown Current

o Preset 5V or Adjustable Output (3V to 16.5V)

o Current-Limited PFM Control Scheme

o Up to 300kHz Switching Frequency

o Evaluation Kit Available

5V or Adjustable, Low-Voltage,

Step-Up DC-DC Controller

________________________________________________________________

Maxim Integrated Products

1

1

2

3

4

8

7

6

5

CS

GND

AGND

REF

SHDN

FB

OUT

EXT

TOP VIEW

MAX608

DIP/SO

__________________Pin Configuration

FB AGND GND OUT

CS

EXT

N

REF

SHDN

ON/OFF

OUTPUT

5V

INPUT

MAX608

__________Typical Operating Circuit

Call toll free 1-800-998-8800 for free samples or literature.

19-0438; Rev 0; 9/95

EVALUATION

KIT MANUAL

FOLLOWS

DATA

SHEET

* Contact factory for dice specifications.

______________Ordering Information

PART

MAX608C/D

MAX608EPA

MAX608ESA

-40°C to +85°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

Dice*

8 Plastic DIP

-40°C to +85°C

8 SO