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LP3882ES-1.2-LP3882ES-1.5-LP3882ES-1.8
1.5A Fast-Response Ultra Low Dropout Linear Regulators
LP3882
1.5A Fast-Response Ultra Low Dropout Linear
Regulators
General DescriptionThe LP3882isa high current, fast response regulator which
can maintain output voltage regulation with minimum inputto
output voltage drop. Fabricatedona CMOS process, the
device operates from two input voltages: Vbias provides
voltageto drive the gateof the N-MOS power transistor,
while Vinis the input voltage which supplies powerto the
load. The useofan external bias rail allows the partto
operate from ultra low Vin voltages. Unlike bipolar regula-
tors,the CMOS architecture consumes extremely low quies-
cent currentat any output load current. The useof an
N-MOS power transistor resultsin wide bandwidth,yet mini-
mum external capacitanceis requiredto maintain loop sta-
bility.
The fast transient responseof these devices makes them
suitablefor usein powering DSP, Microcontroller Core volt-
ages and Switch Mode Power Supply post regulators. The
partsare availablein TO-220 and TO-263 packages.
Dropout Voltage: 110 mV (typ)@ 1.5A load current.
Ground Pin Current:3 mA (typ)atfull load.
Shutdown Current:60nA (typ) when S/Dpinis low.
Precision Output Voltage: 1.5% room temperature accu-
racy.
Features Ultra low dropout voltage (110 mV@ 1.5A typ) Low groundpin current Load regulationof 0.04%/A60nA typical quiescent currentin shutdown 1.5% output accuracy (25˚C) TO-220, TO-263 packages Over temperature/over current protection −40˚Cto +125˚C junction temperature range
Applications DSP Power Supplies Server Core andI/O Supplies PC Add-in-Cards Local Regulatorsin Set-Top Boxes Microcontroller Power Supplies High Efficiency Power Supplies SMPS Post-Regulators
Typical Application Circuit20063201 least4.7µFof inputand output capacitanceis requiredfor stability.
Connection DiagramsTO-220, Top View
TO-263, Top View
August 2003
LP3882
1.5A
Fast-Response
Ultra
Low
Dropout
Linear
Regulators
