For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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

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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

+

Denotes a lead(Pb)-free/RoHS-compliant package.

19-1462; Rev 1; 12/09

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

EVALUATION

KIT

AVAILABLE