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________________General Description

The MAX6330/MAX6331 combine a precision shunt

regulator with a power-on reset function in a single

SOT23-3 package. They offer a low-cost method of

operating small microprocessor (µP)-based systems

from high-voltage sources, while simultaneously pro-

tecting µPs from power-up, power-down, and brownout

conditions.

Both active-low (MAX6330) and active-high (MAX6331)

push/pull output versions are available. The output

voltage has ±1.5% tolerance. The MAX6330/MAX6331

operate over a wide shunt current range from 100µA to

50mA, and offer very good transient immunity.

A 3-pin SOT23 package allows for a significant reduc-

tion in board space and improves reliability compared

to multiple-IC/discrete solutions. These devices have a

minimum order increment of 2,500 pieces.

________________________Applications

Controllers

Household Appliances

Intelligent Instruments

Critical µP and µC Power Monitoring

Portable/Size-Sensitive Equipment

Automotive

____________________________Features

o 100µA to 50mA Shunt Current Range

o Low Cost

o 3-Pin SOT23 Package

o ±1.5% Tolerance on Output Voltage

o Three Shunt Voltages Available: 5V, 3.3V, 3.0V

o Precision Power-On Reset Threshold:

1.5% Tolerance Available with Either

RESET (MAX6331) or RESET (MAX6330)

Outputs

o 140ms Reset Timeout Period—No External

Components Required

Precision Shunt Regulators with Reset

in SOT23-3

________________________________________________________________

Maxim Integrated Products

1

TOP VIEW

RESET

(RESET)

1

GND

( ) ARE FOR THE MAX6331

SHUNT

MAX6330

MAX6331

SOT23-3

2

3

___________________Pin Configuration

____________Typical Operating Circuit

MAX6330

MAX6331

SHUNT

RESET

(RESET)

RESET

INPUT

GND

0.1

µF*

GND

µP

*SEE THE SECTION

19-1348; Rev 0; 4/98

PART*

MAX6330_UR-T

MAX6331_UR-T

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

3 SOT23-3

3 SOT23-3

_______________Ordering Information

*Insert the desired suffix letter (from the table below) into the

blank to complete the part number. These devices have a mini-

mum order increment of 2,500 pieces.

SUFFIX

L

T

3.06

4.63

RESET

THRESHOLD

(V)

EKAA

EMAA

3.3

5.0

SHUNT

REGULATOR

VOLTAGE (V)

SOT

TOP MARK

ELAA

ENAA

S

3.0

2.78

EDAA

EPAA

MAX6330 MAX6331