AAT3221/2
150mA NanoPower™ LDO Linear Regulator
™
PowerLinear
General Description
Features
The AAT3221 and AAT3222 PowerLinear
NanoPower low dropout (LDO) linear regulators
are ideal for portable applications where extended
battery life is critical. These devices feature
extremely low quiescent current, typically 1.1µA.
Dropout voltage is also very low, typically less than
200mV at the maximum output current of 150mA.
The AAT3221/2 have an enable pin feature which,
when asserted, will enter the LDO regulator into
shutdown mode, removing power from its load and
offering extended power conservation capabilities
for portable battery-powered applications.
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1.1µA Quiescent Current
Low Dropout: 200mV (typical)
Guaranteed 150mA Output
High Accuracy: ±2%
Current Limit Protection
Over-Temperature Protection
Extremely Low Power Shutdown Mode
Low Temperature Coefficient
Factory-Programmed Output Voltages
— 1.6V to 3.5V
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Stable Operation With Virtually Any Output
Capacitor Type
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Active High or Low Enable Pin
4kV ESD
5-Pin SOT23 or 8-Pin SC70JW Package
-40°C to +85°C Temperature Range
The AAT3221/2 have output short-circuit and over-
current protection. In addition, the devices also
have an over-temperature protection circuit, which
will shut down the LDO regulator during extended
over-current events. The devices are available
with active high or active low enable input.
The AAT3221 and AAT3222 are available in Pb-free,
space-saving 5-pin SOT23 packages. The AAT3221
is also available in a Pb-free, 8-pin SC70JW pack-
age. The device is rated over the -40°C to +85°C
temperature range. Since only a small, 1µF ceram-
ic output capacitor is recommended, often the only
space used is that occupied by the AAT3221/2 itself.
The AAT3221/2 provide a compact and cost-effec-
tive voltage conversion solution.
Applications
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Cellular Phones
Digital Cameras
Handheld Electronics
Notebook Computers
PDAs
Portable Communication Devices
Remote Controls
The AAT3221 and AAT3122 are similar to the
AAT3220, with the exception that they offer further
power savings with an enable pin.
Typical Application
INPUT
OUTPUT
IN
OUT
AAT3221/2
ENABLE
EN
(ENABLE)
(EN)
CIN
1µF
COUT
1µF
GND
GND
GND
3221.2005.12.1.11
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