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AT73C237 Datasheet(PDF) 1 Page - ATMEL Corporation |
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AT73C237 Datasheet(HTML) 1 Page - ATMEL Corporation |
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1 / 33 page  Features • LDO1: 2.75V (Default) and 1.8V (Programmable by TWI), 70 mA Linear Very Low Drop Out Regulator with High PSRR and Low Noise. • LDO2: 1.8V (Default) and 1.5V (Programmable by TWI), 70 mA 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 mA Linear Low Drop Out Regulator with high PSRR and Low noise. • LDO4: 1.8V, 2mA Linear Low Drop Out Regulator with Very Low Quiescent Current, +/- 100 mV 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. 1. Description The AT73C237 is a four-channel Power Supply Power Management Unit (PMU) avail- able in a small outline QFN 3 x 3mm package. It is a fully integrated, attractively priced, combined 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 cur- rent, 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 regu- lates 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 to LDOs 1, 2, 3 while operating in switching mode to optimize the quiescent current. The AT73C237 features a Two-wire Interface (TWI) to increase the efficiency of the system by disabling individually each LDO when not needed. Power Management and Analog Companions (PMAAC) AT73C237 4-channel Power Management for Wireless Modules 6362A–PMAAC–01-Jul-08 |
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