1 Features
1• Wide Input Voltage Range (2.7 V to 10 V)
• 2.5% Output Accuracy (25°C)
• Low Dropout Voltage: 450 mV at 1 A
(typical, 5 VOUT)
• Precision (Trimmed) Bandgap Reference
• Ensured Specifications for –40°C to 125°C
• 1-μA Off-State Quiescent Current
• Thermal Overload Protection
• Foldback Current Limiting
• 3-Lead TO-252, 5-Lead SOT-223, and 6-Bump
WSON Packages
• Enable Pin (LP38692)
• Ground Pin Current: 55 μA (typical) at Full Load
• Precision Output Voltage: 2.5% (25°C) Accuracy

2 Applications
• Hard Disk Drives
• Notebook Computers
• Battery Powered Devices
• Portable Instrumentation

3 Description
The LP38690 and LP38692 low-dropout CMOS linear
regulators provide tight output tolerance (2.5%
typical), extremely low dropout voltage (450 mV at a
1-A load current, VOUT = 5 V), and excellent AC
performance utilizing ultra low ESR ceramic output
capacitors.
The low thermal resistance of the WSON, SOT-223,
and TO-252 packages allow the full operating current
to be used even in high ambient temperature
environments.
The use of a PMOS power transistor means that no
DC base drive current is required to bias it allowing
ground pin current to remain below 100 μA
regardless of load current, input voltage, or operating
temperature.