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October 23, 2008

LM4128/LM4128Q

SOT-23 Precision Micropower Series Voltage Reference

General Description

Ideal for space critical applications, the LM4128 precision

voltage reference is available in the SOT-23 surface-mount

package. The LM4128’s advanced design eliminates the

need for an external stabilizing capacitor while ensuring sta-

bility with capacitive loads up to 10 µF, thus making the

LM4128 easy to use.

Series references provide lower power consumption than

shunt references, since they do not have to idle the maximum

possible load current under no load conditions. This advan-

tage, the low quiescent current (60 µA), and the low dropout

voltage (400 mV) make the LM4128 ideal for battery-powered

solutions.

The LM4128 is available in four grades (A, B, C, and D) for

greater flexibility. The best grade devices (A) have an initial

accuracy of 0.1% with guaranteed temperature coefficient of

75 ppm/°C or less, while the lowest grade parts (D) have an

initial accuracy of 1.0% and a tempco of 100 ppm/°C.

Features

■

Output voltage initial accuracy 0.1%

■

Low temperature coefficient 75 ppm/°C

■

Low Supply Current, 60 µA

■

Enable pin allowing a 3 µA shutdown mode

■

Up to 20 mA output current

■

Voltage options 1.8V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V

■

Custom voltage options available (1.8V to 4.096V)

■

range of V

REF

+ 400 mV to 5.5V @10 mA

■

Stable with low ESR ceramic capacitors

■

SOT23-5 Package

■

−40°C to 125°C junction temperature range

■

LM4128AQ/BQ/CQ/DQ are AEC-Q100 Grade 1 qualified

and are manufactured on an Automotive Grade Flow

Applications

■

Instrumentation & Process Control

■

Test Equipment

■

Data Acquisition Systems

■

Base Stations

■

Servo Systems

■

Portable, Battery Powered Equipment

■

Automotive & Industrial Electronics

■

Precision Regulators

■

Battery Chargers

■

Communications

■

Medical Equipment

Typical Application Circuit

20211001

*Note: The capacitor C

is required and the capacitor C

OUT

is optional.

LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference

Summary of content (18 pages)

PAGE 1
LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference General Description Features Ideal for space critical applications, the LM4128 precision voltage reference is available in the SOT-23 surface-mount package. The LM4128’s advanced design eliminates the need for an external stabilizing capacitor while ensuring stability with capacitive loads up to 10 µF, thus making the LM4128 easy to use.
PAGE 2
LM4128/LM4128Q Connection Diagram Top View 20211002 SOT23-5 Package NS Package Number MF05A Ordering Information Input Output Voltage Accuracy at 25°C And Temperature Coefficient 0.1%, 75 ppm/°C (A grade) 0.2%, 75 ppm/°C (B grade) 0.5%, 100 ppm/°C (C grade) 1.0%, 100 ppm/°C max (D grade) www.national.com LM4128 Supplied as 1000 units, Tape and Reel LM4128 Supplied as 3000 units, Tape and Reel Part Marking LM4128AMF-1.8 LM4128AMFX-1.8 R5AA LM4128AMF-2.0 LM4128AMFX-2.0 R5BA LM4128AMF-2.
PAGE 3
0.1%, 75 ppm/°C (AQ grade) 0.2%, 75 ppm/°C (BQ grade) 0.5%, 100 ppm/°C (CQ grade) 1.0%, 100 ppm/°C max (DQ grade) LM4128 Supplied as 1000 units, Tape and Reel LM4128 Supplied as 3000 units, Tape and Reel Part Marking Feature LM4128AQ1MF1.8 LM4128AQ1MFX1.8 R6AA LM4128AQ1MF2.0 LM4128AQ1MFX2.0 R6BA LM4128AQ1MF2.5 LM4128AQ1MFX2.5 R6CA AEC-Q100 Grade 1 qualified. Automotive Grade Production Flow* LM4128AQ1MF3.0 LM4128AQ1MFX3.0 R6DA LM4128AQ1MF3.3 LM4128AQ1MFX3.3 R6EA LM4128AQ1MF4.
PAGE 4
LM4128/LM4128Q Vapor Phase (60 sec) Infrared (15sec) ESD Susceptibility (Note 3) Human Body Model Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Voltage on any input Output short circuit duration Power Dissipation (TA = 25°C) (Note 2) Storage Temperature Range Lead Temperature -0.
PAGE 5
Limits in standard type are for TJ = 25°C only, and limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C unless otherwise specified. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise specified VIN = 5V and ILOAD = 0A.
PAGE 6
LM4128/LM4128Q Electrical Characteristics LM4128-2.5 (VOUT = 2.5V) Limits in standard type are for TJ = 25°C only, and limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C unless otherwise specified. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise specified VIN = 5V and ILOAD = 0A.
PAGE 7
Limits in standard type are for TJ = 25°C only, and limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C unless otherwise specified. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise specified VIN = 5V and ILOAD = 0A.
PAGE 8
LM4128/LM4128Q Electrical Characteristics LM4128-3.3 (VOUT = 3.3V) Limits in standard type are for TJ = 25°C only, and limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C unless otherwise specified. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise specified VIN = 5V and ILOAD = 0A.
PAGE 9
Limits in standard type are for TJ = 25°C only, and limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C unless otherwise specified. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise specified VIN = 5V and ILOAD = 0A. Symbol VREF Parameter IQ Min Typ Max (Note 4) (Note 5) (Note 4) LM4128A-4.
PAGE 10
LM4128/LM4128Q Typical Performance Characteristics for 2.5V Output Voltage vs Temperature Load Regulation 20211054 20211055 Line Regulation 0.1 - 10 Hz Noise 20211021 20211056 Output Voltage Noise Spectrum Power Supply Rejection Ratio vs Frequency 20211057 www.national.
PAGE 11
LM4128/LM4128Q Dropout vs Load to 0.5% Accuracy Typical Long Term Stability 20211008 20211030 Supply Current vs Input Voltage Shutdown IQ vs Input Voltage 20211010 20211053 Ground Current vs Load Current Line Transient Response VIN = 3V to 5V 20211051 20211018 11 www.national.
PAGE 12
LM4128/LM4128Q Load Transient Response ILOAD = 0 to 10mA Short-Circuit Protection and Recovery 20211082 20211050 Start-Up Response 20211083 www.national.
PAGE 13
THEORY OF OPERATION The foundation of any voltage reference is the band-gap circuit. While the reference in the LM4128 is developed from the gate-source voltage of transistors in the IC, principles of the band-gap circuit are easily understood using a bipolar example. For a detailed analysis of the bipolar band-gap circuit, please refer to Application Note AN-56. SUPPLY AND ENABLE VOLTAGES To ensure proper operation, VEN and VIN must be within a specified range.
PAGE 14
LM4128/LM4128Q VREF is in volts (V), VERROR is in milli-volts (mV), and n is the number of bits. mV to ppm error in output voltage: TD = Temperature drift VREF = Nominal preset output voltage VREF_MIN = Minimum output voltage over operating temperature range VREF_MAX = Maximum output voltage over operating temperature range ΔT = Operating temperature range. The LM4128 features a low temperature drift of 75 ppm (max) to 100 ppm (max), depending on the grade, from -40°C to 125°C.
PAGE 15
LM4128/LM4128Q Typical Application Circuits 20211026 FIGURE 3. Voltage Reference with Complimentary Output 20211027 FIGURE 4. Precision Voltage Reference with Force and Sense Output 20211028 FIGURE 5. Programmable Current Source 15 www.national.
PAGE 16
LM4128/LM4128Q Physical Dimensions inches (millimeters) unless otherwise noted SOT23-5 Package NS Package Number MF05A www.national.
PAGE 17
LM4128/LM4128Q Notes 17 www.national.
PAGE 18
LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH www.national.com/webench Audio www.national.com/audio Analog University www.national.com/AU Clock Conditioners www.national.com/timing App Notes www.national.com/appnotes Data Converters www.national.com/adc Distributors www.national.