LP38691/LP38693 500mA Low Dropout CMOS Linear Regulators
Stable with Ceramic Output Capacitors
LP38691
LP38693
500mA Low Dropout CMOS Linear Regulators
Stable with Ceramic Output Capacitors
General Description
The LP38691/3 low dropout CMOS linear regulators provide
tight output tolerance (2.0% typical), extremely low dropout
voltage (250 mV @ 500mA load current, V
OUT
= 5V), and ex-
cellent AC performance utilizing ultra low ESR ceramic output
capacitors.
The low thermal resistance of the LLP, 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 volt-
age, or operating temperature.
Dropout Voltage:
250 mV (typ) @ 500mA (typ. 5V out).
Ground Pin Current:
55 µA (typ) at full load.
Precision Output Voltage:
2.0% (25°C) accuracy.
August 25, 2009
Features
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2.0% output accuracy (25°C)
Low dropout voltage: 250 mV @ 500mA (typ, 5V out)
Wide input voltage range (2.7V to 10V)
Precision (trimmed) bandgap reference
Guaranteed specs for -40°C to +125°C
1µA off-state quiescent current
Thermal overload protection
Foldback current limiting
T0-252, SOT-223 and 6-Lead LLP packages
Enable pin (LP38693)
Applications
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Hard Disk Drives
Notebook Computers
Battery Powered Devices
Portable Instrumentation
Typical Application Circuits
20126501
20126502
Note: * Minimum value required for stability.
**LLP package devices only.
© 2009 National Semiconductor Corporation
201265
www.national.com