1 Features
1• Input Voltage: 2.7 V to 5.5 V
• Adjustable Output Voltage: 0.6 V to 5 V
• FlexCap: Stable with Ceramic, Tantalum, or
Aluminum Capacitors
• Stable With 10-μF Input and Output Capacitors
• Low Ground-Pin Current
• 25-nA Quiescent Current in Shutdown Mode
• Ensured Output Current of 3 A
• Ensured V ADJ Accuracy of ±1.5% at 25°C (A
Grade)
• Ensured Accuracy of ±3.5% at 25°C (STD)
• Overtemperature and Overcurrent Protection
• ENABLE (EN) Pin (LP38501 only)
• –40°C to +125°C Operating Temperature Range

2 Applications
• ASIC Power Supplies In:
– Printers, Graphics Cards, DVD Players
– Set Top Boxes, Copiers, Routers
• DSP and FPGA Power Supplies
• SMPS Regulator
• Conversion from 3.3-V or 5-V Rail

3 Description
TI's FlexCap low-dropout (LDO) linear regulators
feature unique compensation that allow use of any type of output capacitor with no limits on minimum or
maximum equivalent series resistance (ESR). The
LP38501 and LP38503 series of LDOs operate from
a 2.7-V to 5.5-V input supply. These ultra-low-dropout
linear regulators respond very quickly to step changes in load, making them suitable for low-voltage
microprocessor applications. Developed on a CMOS
process (utilizing a PMOS pass transistor) the
LP38501-ADJ and LP38503-ADJ have low quiescent
currents that change little with load current.
• GND Pin Current: Typically 2 mA at 3-A load current.
• Disable Mode: Typically 25-nA quiescent current
when the EN 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% VADJ tolerance (25°C) and 3% over line, load, and temperature.