LP8340 Low Dropout, Low I
Q
, 1.0A CMOS Linear Regulator
October 2003
LP8340
Low Dropout, Low I
Q
, 1.0A CMOS Linear Regulator
General Description
The LP8340 low-dropout CMOS linear regulator is available
in 5V, 3.3V, 2.5V, 1.8V and adjustable output versions. Pack-
aged in the 6ld LLP package and 3ld DPAK. The LP8340 can
deliver up to 1.0A output current.
Typical dropout voltage is 420mV at 1.0A for the 5.0V ver-
sion, 540mV at 1.0A for the 3.3V version, 670mV at 1.0A for
the 2.5V version and 680mV at 800mA for the 1.8V version.
The LP8340 includes a zener trimmed bandgap voltage
reference, foldback current limiting and thermal overload
limiting.
The LP8340 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
420mV Typical Dropout
@
1.0A (V
O
= 5V)
Wide Operating Range
2.7V to 10V
Internal 1.0A 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?LP8340C
0藲C to 125藲C
鈥?LP8340I
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
20060901
Adjustable V
OUT
20060902
漏 2003 National Semiconductor Corporation
DS200609
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