AAT3242
300mA/150mA Dual CMOS LDO Linear Regulator
3242.2005.01.1.4 1
PowerLinear
™
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 (140µA 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°C to +85°C temperature range.
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 Package
• -40°C to +85°C Temperature Range
Applications
• Cellular Phones
• Digital Cameras
• Handheld Instruments
• Microprocessor / DSP Core / I/O Power
• Notebook Computers
• PDAs and Handheld Computers
• Portable Communication Devices
Typical Application
AAT3242
2.2µF
100k
2.2µF
Enable B
Enable A
VIN OUTPUT A
OUTPUT B
POKA
100k
POKB
POKA
OUTA
OUTB
POKB
GNDENB
INB
INA
ENA