AAT3220
150mA NanoPower™ LDO Linear Regulator
Functional Block Diagram
IN
Over-Current
Protection
Over-Temp
Protection
OUT
V
REF
GND
Functional Description
The AAT3220 is intended for LDO regulator appli-
cations where output current load requirements
range from no load to 150mA.
The advanced circuit design of the AAT3220 has
been optimized for minimum quiescent or ground
current consumption, making it ideal for use in
power management systems for small battery-
operated devices. The typical quiescent current
level is just 1.1µA. The LDO also demonstrates
excellent power supply ripple rejection (PSRR) and
load and line transient response characteristics.
The AAT3220 is a truly high performance LDO reg-
ulator especially well suited for circuit applications
which are sensitive to load circuit power consump-
tion and extended battery life.
The LDO regulator output has been specifically
optimized to function with low cost, low equivalent
series resistance (ESR) ceramic capacitors.
However, the design will allow for operation with a
wide range of capacitor types.
The AAT3220 has complete short-circuit and ther-
mal protection. The integral combination of these
two internal protection circuits give the AAT3220 a
comprehensive safety system to guard against
extreme adverse operating conditions. Device
power dissipation is limited to the package type
and thermal dissipation properties. Refer to the
Thermal Considerations section of this datasheet
for details on device operation at maximum output
load levels.
8
3220.2006.01.1.4
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
