MAX769EEI+

The MAX769EEI+ from Analog Devices is a complete buck/boost power supply and monitoring system, primarily designed for two-way pagers and other low-power digital communication devices. It integrates an 80mA synchronous-rectified buck/boost DC-DC converter with a digitally controlled output voltage ranging from +1.8V to +4.9V. This unique converter operates without transformers, providing a regulated output for battery inputs that are both lower and higher than the output voltage.

Key features include three low-noise linear regulator outputs, three DAC-controlled comparators for 3-channel A/D conversion, and an SPI-compatible serial interface. The device also incorporates a charger for NiCd/NiMH, lithium batteries, or storage capacitors, and two 1.8 Ohm MOSFET switches for beeper or vibrator drive. With 85% efficiency and a low 13µA idle mode current, it is suitable for 2 or 3-cell powered handheld equipment.

The MAX769EEI+ is available in a 28-QSOP package and operates within a temperature range of -40°C to +85°C. Its surface mount capability makes it suitable for various compact electronic designs. The input voltage range is 1.5V to 5.5V, supporting common battery configurations.

This IC is well-suited for applications requiring efficient power management in portable devices. Its integrated features reduce the need for external components, simplifying design and reducing board space.