PRODUCT DATASHEET
AAT3242
PowerLinear
TM
300mA/150mA Dual CMOS LDO Linear Regulator
Features
• 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
• 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
General Description
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.
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
POKA
OUTPUT B
100kΩ
POKB
Enable B
ENB
GND
POKB
2.2μF
2.2μF
AAT3242
Enable A
ENA
POKA
OUTB
INB
3242.2008.08.1.11
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