(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
PRELIMINARY
January 2005...
LP38691/LP38693 500mA Low Dropout
CMOS Linear Regulators Stable with Ceramic Output
Capacitors
PRELIMINARY
January 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 µA regardless of load current, input
voltage, 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.
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 1µA 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...