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MAX6138BEXR41-T中文资料

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 Low 28μV RMS Output Noise (10Hz to 10kHz)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

MAX6138

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages

________________________________________________________________Maxim Integrated Products 1

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 https://www.sodocs.net/doc/0f4947980.html,.

M A X 6138

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages 2_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS —MAX6138_12 (1.2205V)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Reverse Current (cathode to anode)..................................20mA Forward Current (anode to cathode)..................................10mA Continuous Power Dissipation (T A = +70°C)

3-Pin SC70 (derate 2.17mW/°C above +70°C) ...........174mW

Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range.............................-65°C to +150°C Junction Temperature......................................................+150°C Lead Temperature (soldering, 10s).................................+300°C

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages

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ELECTRICAL CHARACTERISTICS —MAX6138_21 (2.048V)

ELECTRICAL CHARACTERISTICS —MAX6138_25 (2.5V)

(I R = 100μA, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)

M A X 6138

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages 4_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS —MAX6138_30 (3.0V)

ELECTRICAL CHARACTERISTICS —MAX6138_33 (3.3V)

MAX6138

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages

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ELECTRICAL CHARACTERISTICS —MAX6138_41 (4.096V)

ELECTRICAL CHARACTERISTICS —MAX6138_50 (5.0V)

(I R = 100μA, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)

MAX MIN MAX MIN Note 3:Guaranteed by design.

4.996

4.9984.997

5.0004.9995.0025.0015.003-40

-20

MAX6138_50TEMPERATURE DRIFT

TEMPERATURE (°C)

R E V E R S E V O L T A G E (V )01.51.00.52.02.53.03.54.04.55.0

1020

MAX6138_12

REVERSE VOLTAGE vs. I SHUNT

I SHUNT (mA)

R E V E R S E V O L T A G E C H A N G E (m V )

M A X 6138

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages 6_______________________________________________________________________________________

Typical Operating Characteristics

(I R = 100μA, T A = +25°C, unless otherwise noted.)

43560

100

REVERSE CHARACTERISTICS AND MINIMUM OPERATING CURRENT

REVERSE CURRENT (μA)

R E V E R S E V O L T A G E (V

)

1.22151.2210

1.2205

1.2200

1.2195

-40

-20

MAX6138_12TEMPERATURE DRIFT

TEMPERATURE (°C)

R E V E R S E V O L T A G E (

V )

2.4890

2.49902.4895

2.50002.49952.50102.50052.5015

-40

-20

MAX6138_25TEMPERATURE DRIFT

TEMPERATURE (°C)

R E V E R S E V O L T A G E (V )

MAX6138

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages

_______________________________________________________________________________________

01.51.00.52.02.53.03.54.04.55.00

102015MAX6138_25

REVERSE VOLTAGE vs. I SHUNT

I SHUNT (mA)

R E V E R S E V O L T A G E C H A N G E (m V )

1.51.00.5

2.02.5

3.03.5

4.04.5

5.0

051020

15MAX6138_50

REVERSE VOLTAGE vs. I SHUNT

I SHUNT (mA)

R E V E R S E V O L T A G

E C H A N G E (m V )

4μs/div

MAX6138_12

LOAD-TRANSIENT RESPONSE I SHUNT = 100μA ±25μA R L = 48k ?

+25μA

V R AC-COUPLED 10mV/div MAX6138 toc08

-25μA

10μs/div

MAX6138_25

LOAD-TRANSIENT RESPONSE

I SHUNT = 100μA R L = 100k ?

+25μA

V R AC-COUPLED 10mV/div

MAX6138 toc09

-25μA

Typical Operating Characteristics (continued)

(I R = 100μA, T A = +25°C, unless otherwise noted.)

M A X 6138

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages 8

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40μs/div

MAX6138_50

LOAD-TRANSIENT RESPONSE

I SHUNT = 100μA R L = 100k ?

+25μA

V R AC-COUPLED 20mV/div MAX6138 toc10-25μ

A 10μs/div

MAX6138_12

LOAD-TRANSIENT RESPONSE

I SHUNT = 1mA R L = 10k ?

+250μA

V R AC-COUPLED 2.0mV/div

MAX6138 toc11

-250μ

10μs/div

MAX6138_25

LOAD-TRANSIENT RESPONSE

I SHUNT = 1mA R L = 10k ?

+250μA

V R AC-COUPLED 10mV/div MAX6138 toc12

-250μ

40μs/div

MAX6138_50

LOAD-TRANSIENT RESPONSE

+250μA

V R AC-COUPLED 2mV/div

MAX6138 toc13

-250μA

I SHUNT = 1mA R L = 10k ?

Typical Operating Characteristics (continued)

(I R = 100μA, T A = +25°C, unless otherwise noted.)

MAX6138

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages

_______________________________________________________________________________________

10μs/div

MAX6138_12

LOAD-TRANSIENT RESPONSE

I SHUNT = 10mA R L = 1k ?

+2.5mA

V R AC-COUPLED 100mV/div MAX6138 toc14

-2.5mA 10μs/div

MAX6138_25

LOAD-TRANSIENT RESPONSE

I SHUNT = 10mA R L = 1k ?

+2.5mA

V R AC-COUPLED 5mV/div

MAX6138 toc15

-2.5mA

40μs/div

MAX6138_50

LOAD-TRANSIENT RESPONSE

I SHUNT = 10mA R L = 1k ?

+2.5mA

V R AC-COUPLED 100mV/div

MAX6138 toc16

-2.5mA

200ns/div

MAX6138_12

STARTUP CHARACTERISTICS

I SHUNT = 100μA R S = 30k ?

MAX6138 toc17

1.2V

V IN

OUT

2μs/div

MAX6138_25

STARTUP CHARACTERISTICS

I SHUNT = 100μA R S = 30k ?

05V

MAX6138 toc18

V IN

OUT

100μs/div

MAX6138_50

STARTUP CHARACTERISTICS

I SHUNT = 100μA R S = 16k ?

0V IN

V OUT

MAX6138 toc19

100

10k 1k

100k

MAX6138_12OUTPUT IMPEDANCE vs. FREQUENCY

FREQUENCY (Hz)

I M P E D A N C E (?)

1000

0.1

100

Typical Operating Characteristics (continued)

(I R = 100μA, T A = +25°C, unless otherwise noted.)

M A X 6138

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages 10______________________________________________________________________________________

Typical Operating Characteristics (continued)

(I R = 100μA, T A = +25°C, unless otherwise noted.)

0.1

101

100

1000

MAX6138_25

OUTPUT IMPEDANCE vs. FREQUENCY

FREQUENCY (Hz)

I M P E D A N C E (?)

1000

0.1

100

0.1

101

100

1000

MAX6138_50

OUTPUT IMPEDANCE vs. FREQUENCY

FREQUENCY (Hz)

I M P E D A N C E (?)

100

0.1

110

10010k

MAX6138_12NOISE vs. FREQUENCY

MAX6138 toc23

FREQUENCY (Hz)

N O I S E (n V H z )

10,000

100

1000

10010

10k

MAX6138_25NOISE vs. FREQUENCY

M A X 6138 t o c 24

FREQUENCY (Hz)

10,000

100

1000

N O I S E (n V /H z )

10010

10k

MAX6138_50NOISE vs. FREQUENCY

M A X 6138 t o c 25

FREQUENCY (Hz)

10,000

100

1000

N O I S E (n V /H z )

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages

______________________________________________________________________________________11

Detailed Description

The MAX6138 shunt reference uses the bandgap prin-ciple to produce a stable, accurate voltage. The device behaves similarly to an ideal zener diode; a fixed volt-age is maintained across its output terminals when biased with 60μA to 15mA of reverse current. The MAX6138 behaves similarly to a silicon diode when biased with forward currents up to 10mA.

Figure 3 shows a typical operating circuit. The MAX6138 is ideal for providing a stable reference from a high-voltage power supply.

Applications Information

The MAX6138’s internal pass transistor is used to main-tain a constant output voltage (V SHUNT ) by sinking the necessary amount of current across a source resistor.The source resistance (R S ) is determined from the load current (I LOAD ) range, supply voltage (V S ) variations,V SHUNT , and desired quiescent current.

Choose the value of R S when V S is at a minimum and I LOAD is at a maximum. Maintain a minimum I SHUNT of 60μA at all times. The R

S value should be large enough to keep I SHUNT less than 15mA for proper regulation when V S is maximum and I LOAD is at a minimum. To prevent damage to the device, I SHUNT should never exceed 20mA.

Therefore, the value of R S is bounded by the following equation:

[V S(MIN)- V R ] / [60μA + I LOAD(MAX)] > R S >

[V S(MAX ) - V R ] / [20mA + I LOAD(MIN)]

Choosing a larger resistance minimizes the total power dissipation in the circuit by reducing the shunt current (P D(TOTAL)= V S X I SHUNT ). Provide a safety margin to incorporate the worst-case tolerance of the resistor used. Ensure that the resistor ’s power rating is ade-quate, using the following general power equation:

PD R = I SHUNT ?(V S(MAX)- V SHUNT )

Output Capacitance

The MAX6138 does not require an external capacitor for operational stability and is stable for any output capacitance.

Temperature Performance

The MAX6138 typically exhibits an output voltage tem-perature coefficient within ±4ppm/°C. The polarity of the temperature coefficient may be different from one device to another; some may have positive coefficients,and others may have negative coefficients.

Chip Information

TRANSISTOR COUNT: 70PROCESS: BiCMOS

M A X 6138

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages 12

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Ordering Information

MAX6138

0.1%, 25ppm, SC70 Shunt Voltage Reference with Multiple Reverse Breakdown Voltages

Maxi m cannot assume responsi bi li ty for use of any ci rcui try other than ci rcui try enti rely embodi ed i n a Maxi m product. No ci rcui t patent li censes are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________13?2004 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

Package Information

MAX6138BEXR41-T中文资料

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