Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - voltage reference Shunt Adjustable SC 70 3

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

♦ Ultra-Small 3-Pin SC70 Package

♦ 0.1% (max) Initial Accuracy

♦ 25ppm/°C (max) Temperature Coefficient

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

Range

♦ Wide Operating Current Range: 60µA to 15mA

♦ Low 28µV

RMS

Output Noise (10Hz to 10kHz)

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

Fixed Reverse Breakdown Voltages

♦ No Output Capacitors Required

♦ Stable with Capacitive Loads

MAX6138

0.1%, 25ppm, SC70 Shunt Voltage Reference

with Multiple Reverse Breakdown Voltages

________________________________________________________________ Maxim Integrated Products 1

MAX6138

LOAD

SHUNT

+ I

LOAD

3 N.C.*

MAX6138

SC70

TOP VIEW

*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.

Summary of content (13 pages)

PAGE 1
9-2090; Rev 2; 4/04 0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages 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 applications, 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 surfacemount packages.
PAGE 2
MAX6138 0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages ABSOLUTE MAXIMUM RATINGS Reverse Current (cathode to anode) ..................................20mA Forward Current (anode to cathode) ..................................10mA Continuous Power Dissipation (TA = +70°C) 3-Pin SC70 (derate 2.17mW/°C above +70°C) ...........174mW Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range .............................
PAGE 3
0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages (IR = 100µA, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Reverse Breakdown Voltage (Note 2) VR Minimum Operating Current Reverse Voltage Temperature Coefficient (Notes 2, 3) Reverse Breakdown Voltage Change with Operating Current Change CONDITIONS TA = +25°C MIN TYP MAX MAX6138A (0.1%) 2.0460 2.0480 2.0500 MAX6138B (0.2%) 2.0439 2.0480 2.
PAGE 4
MAX6138 0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages ELECTRICAL CHARACTERISTICS—MAX6138_30 (3.0V) (IR = 100µA, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Reverse Breakdown Voltage (Note 2) Minimum Operating Current Reverse Voltage Temperature Coefficient (Notes 2, 3) Reverse Breakdown Voltage Change with Operating Current Change SYMBOL MIN TYP MAX MAX6138A (0.1%) 2.9970 3.0000 3.0030 MAX6138B (0.2%) 2.
PAGE 5
0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages (IR = 100µA, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Reverse Breakdown Voltage (Note 2) Minimum Operating Current Reverse Voltage Temperature Coefficient (Notes 2, 3) Reverse Breakdown Voltage Change with Operating Current Change SYMBOL MIN TYP MAX MAX6138A (0.1%) 4.0919 4.0960 4.1001 MAX6138B (0.2%) 4.0878 4.0960 4.1042 MAX6138C (0.5%) 4.0755 4.
PAGE 6
Typical Operating Characteristics (IR = 100µA, TA = +25°C, unless otherwise noted.) MAX6138_12 TEMPERATURE DRIFT MAX6138_30 3 MAX6138_25 MAX6138_20 2 MAX6138_12 2.5010 1.2210 REVERSE VOLTAGE (V) REVERSE VOLTAGE (V) MAX6138_41 4 2.5015 MAX6138 toc02 MAX6138_50 5 1.2215 MAX6138 toc01 6 MAX6138_25 TEMPERATURE DRIFT MAX6138 toc03 REVERSE CHARACTERISTICS AND MINIMUM OPERATING CURRENT REVERSE VOLTAGE (V) 1.2205 1.2200 1 2.5005 2.5000 2.4995 2.4990 2.
PAGE 7
0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages MAX6138_25 REVERSE VOLTAGE vs. ISHUNT MAX6138_50 REVERSE VOLTAGE vs. ISHUNT 4.5 3.5 3.0 TA = +25°C 2.5 2.0 1.5 MAX61438 toc07 TA = +85°C REVERSE VOLTAGE CHANGE (mV) REVERSE VOLTAGE CHANGE (mV) 4.5 4.0 5.0 MAX61438 toc06 5.0 TA = -40°C 1.0 0.5 4.0 TA = +85°C 3.5 3.0 TA = +25°C 2.5 2.0 1.5 TA = -40°C 1.0 0.
PAGE 8
MAX6138 0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages Typical Operating Characteristics (continued) (IR = 100µA, TA = +25°C, unless otherwise noted.) MAX6138_50 LOAD-TRANSIENT RESPONSE MAX6138_12 LOAD-TRANSIENT RESPONSE MAX6138 toc10 MAX6138 toc11 +25µA +250µA -25µA -250µA VR AC-COUPLED 20mV/div VR AC-COUPLED 2.
PAGE 9
0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages MAX6138_12 LOAD-TRANSIENT RESPONSE MAX6138_25 LOAD-TRANSIENT RESPONSE MAX6138 toc14 MAX6138 toc15 +2.5mA +2.5mA -2.5mA -2.5mA VR AC-COUPLED 100mV/div VR AC-COUPLED 5mV/div 10µs/div 10µs/div ISHUNT = 10mA RL = 1kΩ ISHUNT = 10mA RL = 1kΩ MAX6138_12 STARTUP CHARACTERISTICS MAX6138_50 LOAD-TRANSIENT RESPONSE MAX6138 toc17 MAX6138 toc16 5V +2.5mA -2.5mA VIN 0 1.
PAGE 10
Typical Operating Characteristics (continued) (IR = 100µA, TA = +25°C, unless otherwise noted.) MAX6138_25 OUTPUT IMPEDANCE vs. FREQUENCY MAX6138_50 OUTPUT IMPEDANCE vs. FREQUENCY CL = 1µF MAX6138 toc22 100 MAX61438 toc21 1000 CL = 0 IMPEDANCE (Ω) IMPEDANCE (Ω) 100 IR = 150µA 10 CL = 0 10 IR = 150µA IR = 1mA 1 1 CL = 1µF IR = 1mA 0.1 0.1 1 10 100 1000 0.1 1 10 100 FREQUENCY (Hz) FREQUENCY (Hz) MAX6138_12 NOISE vs. FREQUENCY MAX6138_25 NOISE vs.
PAGE 11
0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages PIN NAME FUNCTION 1 + Positive Terminal of the Shunt Reference 2 - Negative Terminal of the Shunt Reference 3 N.C. No Connection. Leave this pin unconnected or connect to Pin 2. Detailed Description The MAX6138 shunt reference uses the bandgap principle to produce a stable, accurate voltage.
PAGE 12
MAX6138 0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages Ordering Information PART OUTPUT VOLTAGE (V) INITIAL ACCURACY (%) TEMP RANGE PIN-PACKAGE TOP MARK MAX6138AEXR12-T 1.2205 0.1 -40°C to +85°C 3 SC70-3 AEW MAX6138BEXR12-T 1.2205 0.2 -40°C to +85°C 3 SC70-3 AEX MAX6138CEXR12-T 1.2205 0.5 -40°C to +85°C 3 SC70-3 AEY MAX6138AEXR21-T 2.0480 0.1 -40°C to +85°C 3 SC70-3 AFA MAX6138BEXR21-T 2.0480 0.
PAGE 13
0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages SC70, 3L.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.