AAT3258_06 Datasheet, PDF (1/16 Pages) Advanced Analogic Technologies – 300mA LDO Linear Regulator with μP Reset

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 Pb-free, space-sav-
ing 8-pin TSOPJW package. This device is capa-
ble of operation over a -40°C to +85°C temperature
range.
Typical Application
Features
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
• Cellular Phones
• Digital Cameras
• Handheld Instrumentation
• Microprocessor/DSP Core/IO Power
• Notebook Computers
• PDAs and Handheld Computers
• Portable Communication Devices
100k
VIN
1µF
µP Reset
Manual Reset
LDO Shutdown
VDET
RESET
VIN
VOUT
AAT3258
MR
GND
SHDN
BYP
10nF
RESET OUT
LDO VOUT
2.2µF
3258.2006.03.1.6
1