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LP3871 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LP3871
Description  0.8A Fast Ultra Low Dropout Linear Regulators
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LP3871 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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LP3871/LP3874
0.8A Fast Ultra Low Dropout Linear Regulators
General Description
The LP3871/LP3874 series of fast ultra low-dropout linear
regulators operate from a +2.5V to +7.0V input supply. Wide
range of preset output voltage options are available. These
ultra low dropout linear regulators respond very quickly to
step changes in load, which makes them suitable for low
voltage microprocessor applications. The LP3871/LP3874
are developed on a CMOS process which allows low quies-
cent current operation independent of output load current.
This CMOS process also allows the LP3871/LP3874 to op-
erate under extremely low dropout conditions.
Dropout Voltage: Ultra low dropout voltage; typically 24mV
at 80mA load current and 240mV at 0.8A load current.
Ground Pin Current: Typically 6mA at 0.8A load current.
Shutdown Mode: Typically 10nA quiescent current when
the shutdown pin is pulled low.
Error Flag: Error flag goes low when the output voltage
drops 10% below nominal value.
SENSE: Sense pin improves regulation at remote loads.
Precision Output Voltage: Multiple output voltage options
are available ranging from 1.8V to 5.0V with a guaranteed
accuracy of ±1.5% at room temperature, and ±3.0% over all
conditions (varying line, load, and temperature).
Features
n
Ultra low dropout voltage
n
Low ground pin current
n
Load regulation of 0.04%
n
10nA quiescent current in shutdown mode
n
Guaranteed output current of 0.8A DC
n
Available in TO-263 and TO-220 packages
n
Output voltage accuracy ± 1.5%
n
Error flag indicates output status
n
Sense option improves load regulation
n
Minimum output capacitor requirements
n
Overtemperature/overcurrent protection
n
−40˚C to +125˚C junction temperature range
Applications
n
Microprocessor power supplies
n
GTL, GTL+, BTL, and SSTL bus terminators
n
Power supplies for DSPs
n
SCSI terminator
n
Post regulators
n
High efficiency linear regulators
n
Battery chargers
n
Other battery powered applications
Typical Application Circuits
20063101
*SD and ERROR pins must be pulled high through a 10k
Ω pull-up resistor. Connect the ERROR pin to ground if this function is not used. See application hints
for more information.
September 2003
© 2003 National Semiconductor Corporation
DS200631
www.national.com


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