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LM4120 Datasheet

Precision Micropower Low Dropout Voltage Reference

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February 2000
LM4120
Precision Micropower Low Dropout Voltage Reference
General Description
The LM4120 is a precision low power low dropout bandgap
voltage reference with up to 5 mA output current source and
sink capability.
This series reference operates with input voltages as low as
2V and up to 12V consuming 160 µA (Typ.) supply current. In
power down mode, device current drops to less than 2 µA.
The LM4120 comes in two grades (A and Standard) and
seven voltage options for greater flexibility. The best grade
devices (A) have an initial accuracy of 0.2%, while the stan-
dard have an initial accuracy of 0.5%, both with a tempco of
50ppm/˚C guaranteed from −40˚C to +125˚C.
The very low dropout voltage, low supply current and
power-down capability of the LM4120 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 LM4120 is available in
a standard 5-pin SOT-23 package.
Features
n Small SOT23-5 package
n Low dropout voltage:
120 mV Typ @ 1 mA
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 Fixed output voltages: 1.8, 2.048, 2.5, 3.0, 3.3, 4.096
and 5.0V
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
Functional Block Diagram
Connection Diagram
DS101047-2
Refer to the Ordering Information Table in this Data Sheet for Specific
Part Number
SOT23-5 Surface Mount Package
DS101047-1
© 2000 National Semiconductor Corporation DS101047
www.national.com


National Semiconductor Electronic Components Datasheet

LM4120 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
LM4120 Supplied as
1000 Units, Tape and
Reel
LM4120AIM5-1.8
LM4120AIM5-2.0
LM4120AIM5-2.5
0.2%, 50 ppm/˚C max (A grade)
LM4120AIM5-3.0
LM4120AIM5-3.3
LM4120AIM5-4.1
LM4120AIM5-5.0
LM4120IM5-1.8
LM4120IM5-2.0
LM4120IM5-2.5
0.5%, 50 ppm/˚C max
LM4120IM5-3.0
LM4120IM5-3.3
LM4120IM5-4.1
LM4120IM5-5.0
LM4120 Supplied as
3000 Units, Tape and
Reel
LM4120AIM5X-1.8
LM4120AIM5X-2.0
LM4120AIM5X-2.5
LM4120AIM5X-3.0
LM4120AIM5X-3.3
LM4120AIM5X-4.1
LM4120AIM5X-5.0
LM4120IM5X-1.8
LM4120IM5X-2.0
LM4120IM5X-2.5
LM4120IM5X-3.0
LM4120IM5X-3.3
LM4120IM5X-4.1
LM4120IM5X-5.0
Top
Marking
R21A
R14A
R08A
R15A
R16A
R17A
R18A
R21B
R14B
R08B
R15B
R16B
R17B
R18B
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:
21 = 1.800V Voltage Option
14 = 2.048V Voltage Option
08 = 2.500V Voltage Option
15 = 3.000V Voltage Option
16 = 3.300V Voltage Option
17 = 4.096V Voltage Option
18 = 5.000V Voltage Option
Fourth Field:
A-B = Initial Reference Voltage Tolerance
A = ±0.2%
B = ±0.5%
www.national.com
2


Part Number LM4120
Description Precision Micropower Low Dropout Voltage Reference
Maker National Semiconductor
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LM4120 Datasheet PDF





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