AAT3242
300mA/150mA Dual CMOS LDO Linear Regulator
General Description
The AAT3242 is a dual low dropout linear regulator
with Power OK (POK) outputs. Two integrated reg-
ulators provide 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 inde-
pendent input voltage and enable pins for increased
design flexibility. This device features a very low
quiescent current (140碌A typical) and low dropout
voltages (typically 200mV and 400mV at the full
output current level), making it ideal for portable
applications where extended battery life is critical.
The AAT3242 has complete over-current/short-cir-
cuit and over-temperature protection circuits to
guard against extreme operating conditions.
The AAT3242 is available in a space-saving 12-pin
TSOPJW package. This device is capable of oper-
ation over the -40擄C to +85擄C temperature range.
Features
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PowerLinear
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High/Low Current Outputs, 300mA/150mA
Low Dropout:
鈥?LDO A: 400mV at 300mA
鈥?LDO B: 200mV at 150mA
High Output Voltage Accuracy: 鹵1.5%
High PSRR: 65dB at 1KHz
70碌A 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 Package
-40擄C to +85擄C Temperature 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
100k
POKA
OUTPUT B
100k
POKB
Enable B
ENB
GND
POKB
2.2碌F
2.2碌F
AAT3242
Enable A
ENA
POKA
OUTB
INB
3242.2005.01.1.4
1
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