LM4121AIM5-1.2 National Semiconductor, LM4121AIM5-1.2 Datasheet

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LM4121AIM5-1.2

Manufacturer Part Number
LM4121AIM5-1.2
Description
Precision Micropower Low Dropout Voltage Reference
Manufacturer
National Semiconductor
Datasheet

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© 2000 National Semiconductor Corporation
LM4121
Precision Micropower Low Dropout Voltage Reference
General Description
The LM4121 is a precision bandgap voltage reference avail-
able in a fixed 1.25V and adjustable version with up to 5 mA
current source and sink capability.
This series reference operates with input voltages as low as
1.8V and up to 12V consuming 160 µA (Typ.) supply current.
In power down mode, device current drops to less than 2 µA.
The LM4121 comes in two grades A and Standard. The best
grade devices (A) have an initial accuracy of 0.2%, while the
standard have an initial accuracy of 0.5%, both with a
tempco of 50ppm/˚C guaranteed from −40˚C to +125˚C.
The very low operating voltage, low supply current and
power-down capability of the LM4121 makes this product an
ideal choice for battery powered and portable applications.
The device performance is guaranteed over the industrial
temperature range (−40˚C to +85˚C), while certain specs are
guaranteed over the extended temperature range (−40˚C to
+125˚C). Please contact National for full specifications over
the extended temperature range. The LM4121 is available in
a standard 5-pin SOT-23 package.
*
LM4121-ADJ only
Resistors are removed on the LM4121-ADJ
LM4121-1.2 Block Diagram
DS101291
DS101291-1
Features (LM4121-1.2)
n Small SOT23-5 package
n Low voltage operation
n High output voltage accuracy:
n Source and Sink current output:
n Supply current:
n Low Temperature Coefficient:
n Enable pin
n Output voltages:
n Industrial temperature Range:
n (For extended temperature range, −40˚C to 125˚C,
Applications
n Portable, battery powered equipment
n Instrumentation and process control
n Automotive & Industrial
n Test equipment
n Data acquisition systems
n Precision regulators
n Battery chargers
n Base stations
n Communications
n Medical equipment
Connection Diagram
Refer to the Ordering Information Table in this Data Sheet for Specific
Part Number
contact National Semiconductor)
SOT23-5 Surface Mount Package
DS101291-35
DS101291-2
1.25V and Adjustable
−40˚C to +85˚C
www.national.com
160 µA Typ.
50 ppm/˚C
April 2000
±
5 mA
0.2%

Related parts for LM4121AIM5-1.2

LM4121AIM5-1.2 Summary of contents

Page 1

... The LM4121 is available in a standard 5-pin SOT-23 package. LM4121-1.2 Block Diagram * Resistors are removed on the LM4121-ADJ † LM4121-ADJ only © 2000 National Semiconductor Corporation Features (LM4121-1.2) n Small SOT23-5 package n Low voltage operation n High output voltage accuracy: n Source and Sink current output: n Supply current: ...

Page 2

... Voltage Option 20 = Adjustable Fourth Field: A-B = Initial Reference Voltage Tolerance ± 0.2% ± 0.5% www.national.com LM4121 Supplied as LM4121 Supplied as 1000 Units, Tape and 3000 Units, Tape and Reel Reel LM4121AIM5-1.2 LM4121AIM5X-1.2 LM4121AIM5-ADJ LM4121AIM5X-ADJ LM4121IM5-1.2 LM4121IM5X-1.2 LM4121IM5-ADJ LM4121IM5X-ADJ 2 Top Marking R19A R20A R19B R20B ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Voltage on input or enable pins Output Short-Circuit Duration Power Dissipation (T = 25˚C) (Note 2): A MA05B package − JA Power Dissipation ESD Susceptibility (Note 3) ...

Page 4

Electrical Characteristics LM4121-ADJ Unless otherwise specified V its with standard typeface are for T j range. Symbol Parameter Output Voltage Initial OUT REF Accuracy LM4121A-ADJ LM4121-ADJ TCV /˚C Temperature Coefficient REF Line Regulation REF ...

Page 5

LM4121- (All Options) Typical Operating Characteristics = 3.3V 1.25V OUT LOAD OUT Minimum Input Voltage vs Temperature GND Pin Current at No Load vs Temperature = 0.022µ 25˚C and ...

Page 6

LM4121- (All Options) Typical Operating Characteristics V = 3.3V 1.25V OUT LOAD Short Circuit vs Temperature PSRR vs Frequency www.national.com = 0.022µ 25˚C and OUT A EN Output ...

Page 7

LM4121- (All Options) Typical Operating Characteristics V = 3.3V 1.25V OUT LOAD Start-Up Response Load Step Response = 0.022µ 25˚C and OUT A EN Enable Response DS101291-21 Load ...

Page 8

LM4121- (All Options) Typical Operating Characteristics V = 3.3V 1.25V OUT LOAD Line Step Response Noise Spectural Density (10Hz-10kHz) www.national.com = 0.022µ 25˚C and OUT A EN Noise ...

Page 9

LM4121-1.25 Typical Operating Characteristics = 1.25V 0.022µF, T LOAD OUT Typical Temperature Drift Line Regulation = 25˚C and Long Term Drift DS101291-28 Load Regulation DS101291-30 9 Unless otherwise ...

Page 10

LM4121-ADJ Typical Operating Characteristics = 1.2V 0.022µF, T LOAD OUT Typical Temperature Drift Dropout Voltage vs Output Error www.national.com = 25˚C and Long Term Drift DS101291-16 Dropout Voltage ...

Page 11

LM4121-ADJ Typical Operating Characteristics = 1.2V 0.022µF, T LOAD OUT Line Regulation Adjust Pin Bias Current = 25˚C and (Continued Load Regulation DS101291-37 Change In Reference Voltage vs ...

Page 12

LM4121-ADJ Typical Operating Characteristics = 1.2V 0.022µF, T LOAD OUT Bode Plot www.national.com = 25˚C and (Continued Bode Plot DS101291-41 12 Unless otherwise specified 3.3V, V ...

Page 13

Pin Functions Output (Pin 5): Reference Output. Input (Pin 4):Positive Supply. Ground (Pin 2):Negative Supply or Ground Connection. Enable (Pin 3):Pulled to input for normal operation. Forcing this pin to ground will turn-off the output. REF (Pin 1):REF Pin (1.25V ...

Page 14

Typical Application Circuits Voltage Reference with Negative Output 100mA Quasi-LDO Regulator Boosted Output Current with Negative Voltage Reference www.national.com Voltage Reference with Complimentary Output DS101291-3 DS101291-4 DS101291-5 14 Two Terminal Constant Current Source Precision Voltage Reference with Force and Sense ...

Page 15

Typical Application Circuits (Continued) Programmable Current Source Precision Comparator with Hysteresis DS101291-10 DS101291-11 15 Power Supply Splitter DS101291- Low Battery Detector DS101291-44 Flasher Circuit DS101291-45 www.national.com ...

Page 16

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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