PRODUCT DATASHEET
AAT3242
TM
PowerLinear
300mA/150mA Dual CMOS LDO Linear Regulator
General Description
Features
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The AAT3242 is a dual low dropout linear regulator with
Power OK (POK) outputs. Two integrated regulators pro-
vide a high power 300mA output and a lower power
150mA output, making this device ideal for use with
microprocessors and DSP cores in portable products.
Two POK pins provide open drain output signals when
their respective regulator output is within regulation.
The AAT3242 has independent input voltage and enable
pins for increased design flexibility. This device features
a very low quiescent current (140μA typical) and low
dropout voltages (typically 200mV and 400mV at the full
output current level), making it ideal for portable appli-
cations where extended battery life is critical. The
AAT3242 has complete over-current/short-circuit and
over-temperature protection circuits to guard against
extreme operating conditions.
High/Low Current Outputs, 300mA/150mA
Low Dropout:
LDO A: 400mV at 300mA
LDO B: 200mV at 150mA
High Output Voltage Accuracy: ±1.5%
High PSRR: 65dB at 1kHz
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70μA Quiescent Current for Each LDO
Over-Current/Short-Circuit Protection
Over-Temperature Protection
Two POK Outputs
Independent Power and Enable Inputs
Uses Low Equivalent Series Resistance (ESR) Ceramic
Capacitors
12-Pin TSOPJW and TDFN33 Packages
-40°C to +85°C Temperature Range
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The AAT3242 is available in the space-saving, Pb-free,
12-pin TSOPJW and TDFN33 packages. This device is
capable of operation over the -40°C to +85°C tempera-
ture range.
Applications
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Cellular Phones
Digital Cameras
Handheld Instruments
Microprocessor / DSP Core / I/O Power
Notebook Computers
PDAs and Handheld Computers
Portable Communication Devices
Typical Application
VIN
INA
OUTA
OUTPUT A
100kΩ
AAT3242
Enable A
Enable B
ENA
INB
POKA
POKA
OUTPUT B
OUTB
100kΩ
POKB
GND
POKB
ENB
2.2μF
2.2μF
w w w . a n a l o g i c t e c h . c o m
3242.2008.08.1.11
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