LP38501-ADJ Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – 3A FlexCap Low Dropout Linear Regulator for 2.7V to 5.5V Inputs

May 19, 2008
LP38501/3-ADJ, LP38501A/3A-ADJ
3A FlexCap Low Dropout Linear Regulator for 2.7V to 5.5V
Inputs
General Description
National's FlexCap LDO's feature unique compensation that
allows the use of any type of output capacitor with no limits
on minimum or maximum ESR. The LP38501/3 series of low-
dropout linear regulators operates from a +2.7V to +5.5V input
supply. These ultra low dropout linear regulators respond very
quickly to step changes in load, which makes them suitable
for low voltage microprocessor applications. Developed on a
CMOS process, (utilizing a PMOS pass transistor), the
LP38501/3 has low quiescent current that changes little with
load current.
Ground Pin Current: Typically 2 mA at 3A load current.
Disable Mode: Typically 25 nA quiescent current when the
Enable pin is pulled low.
Simplified Compensation: Stable with any type of output
capacitor, regardless of ESR.
Precision Output: "A" grade versions available with 1.5%
V_ADJ tolerance (25°C) and 3% over line, load and tempera-
ture.
Features
■ ^{FlexCap: Stable with ceramic, tantalum, or aluminum}
capacitors
■ ^{Stable with 10 µF input/output capacitor}
■ ^{Adjustable output voltage from 0.6V to 5V}
■ ^{Low ground pin current}
■ ^{25 nA quiescent current in shutdown mode}
■ ^{Guaranteed output current of 3A}
■ ^{Available in TO-263, TO-263 THIN packages}
■ ^{Guaranteed V}_ADJ ^{accuracy of ±1.5% @ 25°C (A Grade)}
■ ^{Guaranteed V}_ADJ ^{accuracy of ±3.5% @ 25°C (STD)}
■ ^{Over-Temperature and Over-Current protection}
■ ^{−40°C to +125°C operating T}_J ^range
■ ^{Enable pin (LP38501)}
Applications
■ ^{ASIC Power Supplies In:}
Printers, Graphics Cards, DVD Players
Set Top Boxes, Copiers, Routers
■ ^{DSP and FPGA Power Supplies}
■ ^{SMPS Regulator}
■ ^{Conversion from 3.3V or 5V Rail}
Typical Application Circuit
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