LP38691-ADJ_10 Datasheet, PDF (1/14 Pages) National Semiconductor (TI) – 500mA Low Dropout CMOS Linear Regulators with Adjustable Output Stable with Ceramic Output Capacitors

LP38691-ADJ
LP38693-ADJ
September 24, 2010
500mA Low Dropout CMOS Linear Regulators with
Adjustable Output
Stable with Ceramic Output Capacitors
General Description
The LP38691/3-ADJ low dropout CMOS linear regulators pro-
vide 2.0% precision reference voltage, extremely low dropout
voltage (250mV @ 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 and SOT-223 pack-
ages 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.
Adjust Pin Voltage: 2.0% (25°C) accuracy.
Features
■ ^{Output voltage range of 1.25V - 9V}
■ ^{2.0% adjust pin voltage accuracy (25°C)}
■ ^{Low dropout voltage: 250mV @ 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}
■ ^{SOT-223 and 6-Lead LLP packages}
■ ^{Enable pin (LP38693-ADJ)}
Applications
■ ^{Hard Disk Drives}
■ ^{Notebook Computers}
■ ^{Battery Powered Devices}
■ ^{Portable Instrumentation}
Typical Application Circuits
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Note: *Minimum value required for stability.
V_OUT = V_ADJ x (1 + R1/R2)
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