_______________General Description

The MAX761/MAX762 step-up switching regulators

provide high efficiency over a wide range of load currents,

delivering up to 150mA. A unique, current-limited

pulse-frequency-modulated (PFM) control scheme gives

the devices the benefits of pulse-width-modulated (PWM)

converters (high efficiency with heavy loads), while using

less than 110µA of supply current (vs. 2mA to 10mA for

PWM converters). The result is high efficiency over a wide

range of loads.

The MAX761/MAX762 input voltage range is 2V to 16.5V.

Output voltages are preset to 12V (MAX761) and 15V

(MAX762), or they can be set with two external resistors.

With a 5V input, the MAX761 guarantees a 12V, 150mA

output. Its high efficiency, low supply current, fast start-up

time, SHDN controlling capability, and small size make the

MAX761 ideal for powering flash memory.

The MAX761/MAX762 have an internal 1A power MOS-

FET, making them ideal for minimum-component, low- and

medium-power applications. These devices use tiny exter-

nal components, and their high switching frequencies (up

to 300kHz) allow for small surface-mount magnetics.

For increased output drive capability or higher output volt-

ages, use the MAX770–MAX773, which are similar in

design to the MAX761/MAX762, but drive external power

MOSFETs. For stepping up to 5V, see the MAX756/

MAX757 and MAX856-MAX859 data sheets.

_________________________Applications

Flash Memory Programming

PCMCIA Cards

Battery-Powered Applications

High-Efficiency DC-DC Converters

____________________________Features

o High Efficiency for a Wide Range of Load Currents

o 12V/150mA Flash Memory Programming Supply

o 110µA Max Supply Current

o 5µA Max Shutdown Supply Current

o 2V to 16.5V Input Voltage Range

o 12V (MAX761), 15V (MAX762) or Adjustable Output

o Current-Limited PFM Control Scheme

o 300kHz Switching Frequency

o Internal, 1A, N-Channel Power FET

o LBI/LBO Low-Battery Comparator

______________Ordering Information

12V/15V or Adjustable, High-Efficiency,

________________________________________________________________

Maxim Integrated Products

1

1

2

3

4

8

7

6

5

V+

LX

GND

REF

SHDN

FB

LBI

LBO

MAX761

MAX762

DIP/SO

TOP VIEW

__________________Pin Configuration

MAX761

LBI

SHDN

V+

FB

REF

LX

OUTPUT

12V

150mA

LOW-BATTERY

DETECTOR OUTPUT

LOW-BATTERY

DETECTOR INPUT

INPUT

4.75V

TO 12V

ON/OFF

GND

LBO

33µF

33µF

18µH

__________Typical Operating Circuit

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

19-0201; Rev 0; 11/93

PART

TEMP. RANGE

PIN-PACKAGE

MAX761CPA

0°C to +70°C

8 Plastic DIP

MAX761CSA

0°C to +70°C

8 SO

MAX761C/D

0°C to +70°C

Dice*

MAX761ESA

-40°C to +85°C

8 SO

MAX761EPA

-40°C to +85°C

8 Plastic DIP

MAX761MJA

-55°C to +125°C

8 CERDIP**

MAX762CPA

0°C to +70°C

8 Plastic DIP

MAX762CSA

0°C to +70°C

8 SO

MAX762C/D

0°C to +70°C

Dice*

MAX762EPA

-40°C to +85°C

8 Plastic DIP

MAX762ESA

-40°C to +85°C

8 SO

MAX762MJA

-55°C to +125°C

8 CERDIP**

* Contact factory for dice specifications.

** Contact factory for availability and processing to MIL-STD-883.

Evaluation

Kit

Available