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LM4121 Datasheet

Precision Micropower Low Dropout Voltage Reference

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April 2000
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.
Features (LM4121-1.2)
n Small SOT23-5 package
n Low voltage operation
n High output voltage accuracy:
0.2%
n Source and Sink current output:
±5 mA
n Supply current:
160 µA Typ.
n Low Temperature Coefficient:
50 ppm/˚C
n Enable pin
n Output voltages:
1.25V and Adjustable
n Industrial temperature Range:
−40˚C to +85˚C
n (For extended temperature range, −40˚C to 125˚C,
contact National Semiconductor)
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
LM4121-1.2 Block Diagram
Connection Diagram
* Resistors are removed on the LM4121-ADJ
LM4121-ADJ only
DS101291-1
DS101291-2
Refer to the Ordering Information Table in this Data Sheet for Specific
Part Number
SOT23-5 Surface Mount Package
DS101291-35
© 2000 National Semiconductor Corporation DS101291
www.national.com


National Semiconductor Electronic Components Datasheet

LM4121 Datasheet

Precision Micropower Low Dropout Voltage Reference

No Preview Available !

Ordering Information
Industrial Temperature Range (−40˚C to + 85˚C)
Initial Output Voltage Accuracy at 25˚C
And Temperature Coefficient
LM4121 Supplied as
1000 Units, Tape and
Reel
0.2%, 50 ppm/˚C max (A grade)
LM4121AIM5-1.2
LM4121AIM5-ADJ
0.5%, 50 ppm/˚C max
LM4121IM5-1.2
LM4121IM5-ADJ
LM4121 Supplied as
3000 Units, Tape and
Reel
LM4121AIM5X-1.2
LM4121AIM5X-ADJ
LM4121IM5X-1.2
LM4121IM5X-ADJ
Top
Marking
R19A
R20A
R19B
R20B
SOT-23 Package Marking Information
Only four fields of marking are possible on the SOT-23’s small surface. This
table gives the meaning of the four fields.
Field Information
First Field:
R = Reference
Second and third Field:
19 = 1.250V Voltage Option
20 = Adjustable
Fourth Field:
A-B = Initial Reference Voltage Tolerance
A = ±0.2%
B = ±0.5%
www.national.com
2


Part Number LM4121
Description Precision Micropower Low Dropout Voltage Reference
Maker National Semiconductor
PDF Download

LM4121 Datasheet PDF





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