LP8345 Low Dropout, Low IQ, 500mA CMOS Linear Regulator
October 2003
LP8345
Low Dropout, Low IQ, 500mA CMOS Linear Regulator
General Description
The LP8345 low-dropout CMOS linear regulator are avail-
able in 5V, 3.3V, 2.5V, 1.8V or adjustable output versions.
Packaged in our 6ld LLP package and 3ld DPAK they can
deliver up to 500mA output current.
Typical dropout voltage
@
500mA is 210mV for the 5.0V
version, 270mV for the 3.3V version and 335mV for the 2.5V
version.
The devices include a zener trimmed bandgap voltage ref-
erence, foldback current limiting and thermal overload limit-
ing.
The LP8345 features a PMOS output transistor which unlike
PNP type low dropout regulators requires no base drive
current. This allows the device ground current to remain less
than 50碌A over operating temperature, supply voltage and
irrespective of the load current.
Features
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鹵
1.5% Typical V
OUT
tolerance
210mV Typical Dropout
@
500mA (V
O
= 5V)
Wide Operating Range
2.7V to 10V
Internal 500mA PMOS Output Transistor
19碌A Typical Quiescent Current
Thermal Overload Limiting
Foldback Current Limiting
Zener Trimmed Bandgap Reference
Space saving LLP package
Temperature Range
鈥?LP8345C
0藲C to 125藲C
鈥?LP8345I
鈭?0藲C to 125藲C
Applications
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Hard Disk Drives
Notebook Computers
Battery Powered Electronics
Portable Instrumentation
Typical Applications
Fixed V
OUT
20064801
Adjustable V
OUT
20064802
漏 2003 National Semiconductor Corporation
DS200648
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