The MAX847 is a complete power-supply and monitoring system for two-way pagers or other low-power digital communications devices. It requires few external components. Included on-chip are: * A 1-cell input, 80mA output, synchronous-rectified boost DC-DC regulator with a digitally controlled +1.8V to +4.9V output * Three low-noise linear-regulator outputs * Three DAC-controlled comparators for software- driven 3-channel A/D conversion * SPI™-compatible serial interface * Reset and low-battery (LBO) warning outputs * Charger for NiCd, NiMH, lithium battery, or storage capacitor for RF PA power or system backup * Two 1.8Ω (typical) serial-controlled open-drain MOSFET switches An evaluation kit for the MAX847 (MAX847EVKIT) is available to aid in design and prototyping. Applications * 1-Cell Powered Handheld Equipment * GPS Receivers * Two-Way Paging * 80mA Output from 1 Cell at 90% Efficiency * 13µA Idle Mode™ (coast) Current * Selectable Low-Noise PWM or Low-Current Operation * PWM Operating Frequency Synchronized to Seven Times an External Clock Source * Operates at 270kHz with No External Clock * Automatic Backup-Battery Switchover https://elecena.pl/product/22337154/1-cell-step-up-two-way-pager-system-ic 2022-12-29 https://elecena.pl/product/22337154/1-cell-step-up-two-way-pager-system-ic 2025-01-17