DATA SHEET AAT3258 300mA LDO Linear Regulator with P Reset General Description Features The AAT3258 combines a high performance, low noise, Integrated LDO Regulator with P Reset 300mA low dropout (LDO) linear regulator with a micro- 300mA Output LDO Regulator processor reset monitor. The 300mA output capability of Low Dropout Regulator, 400mV at 300mA the LDO regulator makes this device ideal for use with High LDO Output Voltage Accuracy, Typically 1.5% microprocessors and DSP cores in portable products. The Very Low Noise and High Power Supply Rejection Ratio microprocessor reset monitor section has very low qui- (PSRR) LDO escent current consumption and has an active low reset Low Quiescent Current at 71A output. The AAT3258 has separate input pins for the LDO Over-Current/Short-Circuit Protection reset monitor and LDO regulator so they may be oper- LDO Over-Temperature Protection ated from independent sources for increased design flex- LDO Power Saving Shutdown Mode ibility. This device features very low quiescent current, Independent Device Power Inputs typically less than 71A. High Accuracy Reset Monitor Threshold: 1.5% Active Low Push-Pull Monitor Reset Output The LDO regulator has low dropout voltage, typically <2.0A of Shutdown Current 400mV at the full output current level, making it ideal for Uses Low Equivalent Series Resistance (ESR) Ceramic portable applications where extended battery life is Capacitors critical. The AAT3258 LDO regulator section has com- -40C to +85C Temperature Range plete over-current/short-circuit and over-temperature 8-Pin TSOPJW Package protection circuits to guard against extreme operating conditions. The device also has an active output pull- down function when disabled. Applications The AAT3258 is available in a Pb-free, space-saving Cellular Phones 8-pin TSOPJW package. This device is capable of opera- Digital Cameras tion over a -40C to +85C temperature range. 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 VOUT LDO VOUT AAT3258 P Reset MR GND Manual Reset 1F SHDN BYP 2.2F LDO Shutdown 10nF Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 202261A Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. August 10, 2012 DATA SHEET AAT3258 300mA LDO Linear Regulator with P Reset Pin Descriptions Pin Symbol Function LDO voltage regulator input pin. This pin should be decoupled with 1F or greater capacitor. See applica- 1 VIN tion information. LDO voltage regulator shutdown pin. This pin should not be left floating. When connected low, all the 2 SHDN internal circuitry is powered down. When high, it is in normal operation. 3 VDET Microprocessor reset input power supply pin. It may be connected to V . IN Manual reset active low input. A logic low signal on MR asserts a reset condition. Asserted reset continues 4 MR as long as MR is low and for a minimum of 150ms after MR returns high. Reset output remains low while V is below the reset threshold and remains so for a minimum of 150ms DET 5 RESET after V rises above the reset threshold. DET 6 GND Ground connection pin. LDO voltage regulator bypass capacitor connection. To improve AC ripple rejection and decrease LDO 7 BYP regulator self noise, connect a 10nF ceramic capacitor between this pin and GND. LDO voltage regulator output pin should be decoupled with a 2.2F or greater value low ESR ceramic 8 OUT capacitor. Pin Configuration TSOPJW-8 (Top View) 1 8 VIN OUT 2 7 SHDN BYP 3 6 VDET GND 5 4 MR RESET Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 202261A Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. August 10, 2012