_______________General Description

The MAX830/MAX831/MAX832/MAX833 are monolithic,

bipolar, pulse-width-modulation (PWM), switch-mode, step-

down DC-DC regulators. Each is rated at 1A. Very few

external components are needed for standard operation

because the power switch, oscillator, feedback, and control

circuitry are all on-chip. Employing a classic buck topology,

these regulators perform high-current step-down functions.

These regulators have excellent dynamic and transient

response characteristics, while featuring cycle-by-cycle cur-

rent limiting to protect against overcurrent faults and short-

circuit output faults. They have a wide 8V to 30V input

range. Outputs for the MAX831/MAX832/MAX833 are fixed

at 5V/3.3V/3V, respectively. The MAX830 output is

adjustable.

Available in 16-pin SO packages, the MAX830–MAX833

have a preset 100kHz oscillator frequency. In addition,

the preset current limit and micropower shutdown can be

externally controlled. See the MAX724/MAX726 data

sheet for more applications information.

_______________________Applications

Distributed Power from High-Voltage Buses

High-Current, High-Voltage Step-Down Applications

Multiple-Output Buck Converter

5V/3.3V/3V/Adjustable-Output, 1A,

Step-Down, PWM, Switch-Mode DC-DC Regulators

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Maxim Integrated Products

1

TOP VIEW

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

MAX830

MAX831

MAX832

MAX833

GND

GND

SHUT

(FB) SENSE

GND

GND

Wide SO

( ) ARE FOR MAX830

* THIS THERMAL RESISTANCE NUMBER IS WITH THE DEVICE WELL MOUNTED

ON 1 oz. COPPER WITH THERMAL PASTE BETWEEN THE IC AND THE

UNDERLYING GROUND PLANE. LOWER THERMAL RESISTANCE IS POSSIBLE

(SEE APPLICATIONS SECTION).

__________________Pin Configuration

VIN

VC

VSW

100

µF

GND

10k

0.047

µF

OUTPUT

5V AT 1A

SENSE

100

µH*

MBR350

470

µF

INPUT

8V TO 30V

MAX831

STEP-DOWN CONVERTER

* CoilCraft DO3316-104

__________Typical Operating Circuit

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

19-0167; Rev 2; 6/95

___________________________Features

o Input Range: Up to 30V

o 1A On-Chip Power Switch

o Adjustable Output (MAX830)

Fixed Outputs: 5V (MAX831)

3.3V (MAX832)

3V (MAX833)

o 100kHz Switching Frequency

o Excellent Dynamic Characteristics

o Few External Components

o 8mA Quiescent Current

o 16-Pin SO Package

o Evaluation Kit Available

______________Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

MAX830CWE

0°C to +70°C

16 Wide SO

MAX832CWE

0°C to +70°C

16 Wide SO

MAX831CWE

0°C to +70°C

16 Wide SO

MAX833CWE

0°C to +70°C

16 Wide SO

EVALUATION

KIT MANUAL

FOLLOWS

DATA

SHEET