General Description

The MAX6138 is a precision, two-terminal shunt mode,

bandgap voltage reference available in fixed reverse

breakdown voltages of 1.2205V, 2.048V, 2.5V, 3.0V,

3.3V, 4.096V, and 5.0V. Ideal for space-critical applica-

tions, the MAX6138 is offered in the subminiature 3-pin

SC70 surface-mount package (1.8mm X 1.8mm), 50%

smaller than comparable devices in SOT23 surface-

mount packages.

Laser-trimmed resistors ensure precise initial accuracy.

With a 25ppm/°C temperature coefficient, the device is

offered in three grades of initial accuracy ranging from

0.1% to 0.5%. The MAX6138 has a 60µA to 15mA shunt-

current capability with low-dynamic impedance, ensuring

stable reverse breakdown voltage accuracy over a wide

range of operating temperatures and currents.

The MAX6138 does not require an external stabilizing

capacitor while ensuring stability with capacitive loads.

The MAX6138 is a higher precision device in a smaller

package than the LM4040/LM4050.

Applications

Portable, Battery-Powered Equipment

Notebook Computers

Cell Phones

Industrial Process Control

Features

o Ultra-Small 3-Pin SC70 Package

o 0.1% (max) Initial Accuracy

o 25ppm/°C (max) Temperature Coefficient

Guaranteed Over -40°C to +85°C Temperature

Range

o Wide Operating Current Range: 60µA to 15mA

o 1.2205V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V, and 5.0V

Fixed Reverse Breakdown Voltages

o No Output Capacitors Required

o Stable with Capacitive Loads

0.1%, 25ppm, SC70 Shunt Voltage Reference

with Multiple Reverse Breakdown Voltages

________________________________________________________________ Maxim Integrated Products

1

MAX6138

-

1

3

N.C.*

+

MAX6138

SC70

TOP VIEW

2

*PIN 3 MUST BE LEFT FLOATING

OR CONNECTED TO PIN 2.

PART

TEMP

RANGE

PIN-

PACKAGE

OUTPUT

VOLTAGE

(V)

MAX6138_EXR12-T -40°C to +85°C

3 SC70-3

1.2205

MAX6138_EXR21-T -40°C to +85°C

3 SC70-3

2.0480

MAX6138_EXR25-T -40°C to +85°C

3 SC70-3

2.5000

MAX6138_EXR30-T -40°C to +85°C

3 SC70-3

3.0000

MAX6138_EXR33-T -40°C to +85°C

3 SC70-3

3.3000

MAX6138_EXR41-T -40°C to +85°C

3 SC70-3

4.0960

MAX6138_EXR50-T -40°C to +85°C

3 SC70-3

5.0000

Pin Configuration

Selector Guide

Typical Operating Circuit

19-2090; Rev 2; 4/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information appears at end of data sheet.