LP3874EMP-33 Datasheet, PDF (1/24 Pages) Texas Instruments – LP3871/LP3874 0.8A Fast Ultra Low Dropout Linear Regulators

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LP3871
LP3874
SNVS225G – FEBRUARY 2003 – REVISED APRIL 2013
LP3871/LP3874 0.8A Fast Ultra Low Dropout Linear Regulators
Check for Samples: LP3871, LP3874
FEATURES
1
•2 Ultra Low Dropout Voltage
• Low Ground Pin Current
• Load Regulation of 0.04%
• 10nA Quiescent Current in Shutdown Mode
• Specified Output Current of 0.8A DC
• Available in DDPAK/TO-263, TO-220 and
SOT-223 Packages
• Output Voltage Accuracy ±1.5%
• Error Flag Indicates Output Status
• Sense Option Improves Load Regulation
• Minimum Output Capacitor Requirements
• Overtemperature/Overcurrent Protection
• −40°C to +125°C Junction Temperature Range
APPLICATIONS
• Microprocessor Power Supplies
• GTL, GTL+, BTL, and SSTL Bus Terminators
• Power Supplies for DSPs
• SCSI Terminator
• Post Regulators
• High Efficiency Linear Regulators
• Battery chargers
• Other Battery Powered Applications
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
quiescent current operation independent of output
load current. This CMOS process also allows the
LP3871/LP3874 to operate 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
ensured accuracy of ±1.5% at room temperature, and
±3.0% over all conditions (varying line, load, and
temperature).
TYPICAL APPLICATION CIRCUITS
INPUT
3.3 V _CIN
10 µF
V_IN
V_OUT
VOUT
LP3871-2.5
+ C_OUT 2.5V, 0.8A
10 µF
SD SENSE
SD*
GND
ERROR*
*SD and ERROR pins must be pulled high through a 10kΩ pull-up resistor. Connect the ERROR pin to ground if this
function is not used. See application hints for more information.
INPUT
3.3 V ± 10% _CIN
10 µF
SD*
V_IN
V_OUT
LP3874-2.5
SD SENSE
GND
+ _{C OUT}
10 µF
VOUT
2.5V, 0.8A
*SD must be pulled high through a 10kΩ pull-up resistor. See application hints for more information.
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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