AT73C237 Datasheet | Atmel

Features .. - LDO1: 2.75V (Default) and 1.8V (Programmable by TWI), 70 m A Linear Very Low Drop Out Regulator with High PSRR and Low Noise. - LDO2: 1.8V (Default) and 1.5V (Programmable by TWI), 70 m A Linear Low Drop Out Regulator with High PSRR and Low Noise. - LDO3: 1.8V (Default) and 1.5V or 1.2V (Programmable by TWI), 70 m A Linear Low Drop Out Regulator with high PSRR and Low noise. - LDO4: 1.8V, 2m A Linear Low Drop Out Regulator with Very Low Quiescent Current, +/100 m V Adjustable. Main Supply Rail from 2.8V to 5.5V Independent Auxiliary Supply for LDO4 Backup Section, 2.8V to 5.5V Internal State Machine for Startup and Delayed Reset Generation Additional External Reset Input Two Wire Interface for Independent Power Up/Power Down and Output Voltage Programming for Each LDO. - LDOs Voltage Customization Possible on Request - Available in 3 x 3 x 0.9 mm 16-pin QFN Package - Applications: GPS Modules, WLAN Devices, Wireless Modules. - - - - - Power Management and Analog panions (PMAAC) AT73C237 4-channel Power Management for Wireless Modules 1. Description The AT73C237 is a four-channel Power Supply Power Management Unit (PMU) available in a small outline QFN 3 x 3mm package. It is a fully integrated, attractively priced, bined Power Management device for wireless modules, GPS and WLAN devices. It integrates 4X Linear Low Drop Out Regulators, three of which (LDO1, 2, 3) provide high-accuracy RF performance and 1X (LDO4) with very low quiescent current, that can be supplied by an external backup battery (VDD4) on a separate rail. An internal Low Power Bandgap (LPBG) requiring no external capacitor for decoupling, is used as reference voltage for LDO4 and starts when VDD4 is present. LDO4 regulates its output voltage with extremely low quiescent current, maximizing the lifetime of the backup battery. An Internal State Machine manages the startup of the other LDOs. An economic High Precision Bandgap (HPBG) provides highly accurate, low noise voltage reference...