_______________General Description

The MAX750A/MAX758A are adjustable-output, CMOS,

step-down, DC-DC switching regulators.

The

MAX758A accepts inputs from 4V to 16V and delivers

750mA, while the MAX750A accepts inputs from 4V to

11V and delivers 450mA. Typical efficiencies are 85%

to 90%. Typical quiescent current is 1.7mA, or only

6µA in shutdown mode. The output does not exhibit

any ripple at subharmonics of the switching frequency

over its specified range.

Pulse-width-modulation (PWM) current-mode control

provides precise output regulation and excellent tran-

sient responses. Output voltage accuracy is guaran-

teed to be ±4.5% plus feedback-resistor tolerance over

line, load, and temperature variations. Fixed-frequency

switching and absence of subharmonic ripple allows

easy filtering of output ripple and noise, as well as the

use of small external components. These regulators

require only a single inductor value to work in most

applications, so no inductor design is necessary.

________________________Applications

Cellular Phones & Radios

Portable Communications Equipment

Portable Instruments

Computer Peripherals

____________________________Features

o Up to 750mA Load Currents

o 160kHz High-Frequency, Current-Mode PWM

o 85% to 96% Efficiencies

o 33µH or 100µH Pre-Selected Inductor Value,

No Component Design Required

o 1.7mA Quiescent Supply Current

o 6µA Shutdown Supply Current

o Adjustable Output Voltage

o Overcurrent, Soft-Start, and Undervoltage

Lockout Protection

o Cycle-by-Cycle Current Limiting

o 8-Pin DIP/SO Packages (MAX750A)

______________Ordering Information

Ordering Information continued on last page.

* Contact factory for dice specifications.

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

Adjustable, Step-Down,

Current-Mode PWM Regulators

________________________________________________________________

Maxim Integrated Products

1

1

2

3

4

8

7

6

5

V+

LX

GND

I.C.

CC

SS

REF

SHDN

DIP

TOP VIEW

MAX750A

MAX758A

1

2

3

4

8

7

6

5

V+

LX

GND

I.C.

CC

SS

REF

MAX750A

SO

SHDN

_________________Pin Configurations

OUTPUT ADJ.

FROM

VREF TO V+

INPUT

4V TO 16V

LX

CC

GND

SS

MAX750A

MAX758A

SHDN

V+

REF

33µH

ON/OFF

__________Typical Operating Circuit

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

19-0195; Rev 0; 10/93

PART

TEMP. RANGE

PIN-PACKAGE

MAX750ACPA

0°C to +70°C

8 Plastic DIP

MAX750ACSA

0°C to +70°C

8 SO

MAX750AC/D

0°C to +70°C

Dice*

MAX750AMJA

-55°C to +125°C

8 CERDIP**

MAX750AESA

-40°C to +85°C

8 SO

MAX750AEPA

-40°C to +85°C

8 Plastic DIP

Pin Configurations continued on last page.