LP38693| Datasheet

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LP38691/LP38693 500mA Low Dropout CMOS Linear Regulators Stable with Ceramic Output Capacitors

September 2005

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, VOUT = 5V), and excellent AC performance utilizing ultra low ESR ceramic output capacitors. The low thermal resistance of the LLP, SOT-223 and T0-252 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 uA regardless of load current, input voltage, or operating temperature. Dropout Voltage: 250 mV (typ) @ 500mA (typ. 5V out). Ground Pin Current: 55 uA (typ) at full load. Precision Output Voltage: 2.0% (25 C) accuracy.

Features
n n n n n n n n n n 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 1uA off-state quiescent current Thermal overload protection Foldback current limiting T0-252, SOT-223 and 6-Lead LLP packages Enable pin (LP38693)

Applications
n n n n 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.

2005 National Semiconductor Corporation

DS201265

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