The MAX769 is a complete buck/boost power supply and monitoring system for two-way pagers or other low-power digital communications devices. Few external components are required. Included on-chip are:
- An 80mA output, synchronous-rectified, buck/boost DC-DC converter with a digitally controlled +1.8V to +4.9V output. The DC-DC converter is unique, since it provides a regulated output for battery inputs that are both less than and greater than the output voltage, without using transformers.
- 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 for beeper or vibrator drive
An evaluation kit for the MAX769 (MAX769EVKIT) is available to aid in design and prototyping.
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