AAT3258
300mA LDO Linear Regulator with µP Reset
General Description
The AAT3258 combines a high performance, low
noise, 300mA low dropout (LDO) linear regulator
with a microprocessor reset monitor. The 300mA
output capability of the LDO regulator makes this
device ideal for use with microprocessors and DSP
cores in portable products. The microprocessor
reset monitor section has very low quiescent cur-
rent consumption and has an active low reset out-
put. The AAT3258 has separate input pins for the
reset monitor and LDO regulator so they may be
operated from independent sources for increased
design flexibility. This device features very low qui-
escent current, typically less than 71µA.
The LDO regulator has low dropout voltage, typical-
ly 400mV at the full output current level, making it
ideal for portable applications where extended bat-
tery life is critical. The AAT3258 LDO regulator sec-
tion has complete over-current/short-circuit and
over-temperature protection circuits to guard against
extreme operating conditions. The device also has
an active output pull down function when disabled.
The AAT3258 is available in a space-saving 8-pin
TSOPJW package. This device is capable of oper-
ation over a -40°C to +85°C temperature range.
Features
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PowerLinear
™
Integrated LDO Regulator with µP Reset
300mA Output LDO Regulator
Low Dropout Regulator, 400mV at 300mA
High LDO Output Voltage Accuracy, Typically
1.5%
Very Low Noise and High Power Supply
Rejection Ratio (PSRR) LDO
Low Quiescent Current at 71µA
LDO Over-Current/Short-Circuit Protection
LDO Over-Temperature Protection
LDO Power Saving Shutdown Mode
Independent Device Power Inputs
High Accuracy Reset Monitor Threshold: ±1.5%
Active Low Push-Pull Monitor Reset Output
<2.0µA of Shutdown Current
Uses Low Equivalent Series Resistance
(ESR) Ceramic Capacitors
-40°C to +85°C Temperature Range
8-Pin TSOPJW Package
Applications
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Cellular Phones
Digital Cameras
Handheld Instrumentation
Microprocessor/DSP Core/IO Power
Notebook Computers
PDAs and Handheld Computers
Portable Communication Devices
Typical Application
100k
VIN
VDET
RESET
RESET OUT
VIN
µP
Reset
Manual Reset
VOUT
LDO VOUT
AAT3258
MR
GND
1µF
LDO Shutdown
SHDN
BYP
10nF
2.2µF
3258.2005.04.1.5
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
