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

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

General Description

The MAX618 CMOS, PWM, step-up DC-DC converter

generates output voltages up to 28V and accepts

inputs from +3V to +28V. An internal 2A, 0.3

Ω switch

eliminates the need for external power MOSFETs while

supplying output currents up to 500mA or more. A

PWM control scheme combined with Idle Mode™ oper-

ation at light loads minimizes noise and ripple while

maximizing efficiency over a wide load range. No-load

operating current is 500µA, which allows efficiency up

to 93%.

A fast 250kHz switching frequency allows the use of

small surface-mount inductors and capacitors. A shut-

down mode extends battery life when the device is not

in use. Adaptive slope compensation allows the

MAX618 to accommodate a wide range of input and

output voltages with a simple, single compensation

capacitor.

The MAX618 is available in a thermally enhanced 16-

pin QSOP package that is the same size as an industry-

standard 8-pin SO but dissipates up to 1W. An

evaluation kit (MAX618EVKIT) is available to help

speed designs.

Applications

Automotive-Powered DC-DC Converters

Industrial +24V and +28V Systems

LCD Displays

Palmtop Computers

Features

o Adjustable Output Voltage Up to +28V

o Up to 93% Efficiency

o Wide Input Voltage Range (+3V to +28V)

o Up to 500mA Output Current at +12V

o 500µA Quiescent Supply Current

o 3µA Shutdown Current

o 250kHz Switching Frequency

o Small 1W 16-Pin QSOP Package

28V, PWM, Step-Up DC-DC Converter

________________________________________________________________

Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

GND

GND

PGND

PGND

PGND

GND

VL

IN

GND

TOP VIEW

MAX618

QSOP

LX

LX

COMP

LX

SHDN

FB

GND

PGND

LX

FB

VL

UP TO 28V

COMP

IN

SHDN

GND

3V TO 28V

MAX618

Typical Operating Circuit

19-1462; Rev 0; 6/99

EVALUATION

KIT MANUAL

FOLLOWS

DATA

SHEET

Pin Configuration

Ordering Information

Idle Mode is a trademark of Maxim Integrated Products.

16 QSOP

PIN-PACKAGE

TEMP. RANGE

-40°C to +85°C

MAX618EEE

PART