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Management IC offers backup switchover control

Posted: 07 Dec 2006     Print Version  Bookmark and Share

Keywords:Maxim Integrated Products  MAX8672  backup-battery  management IC  switchover control 

Maxim Integrated Products has introduced the MAX8672 backup-battery management IC that provides complete charging and backup switchover control for enterprise PDAs and other smart portable devices. The device charges 1-cell or 2-cell NiMH coin-cell batteries and features programmable charge current, termination voltage and charge timer.

An optimised charge algorithm allows standard fast-charge, trickle-charge, and deep-recovery-charge modes to optimise charge time and maximise cell life. An integrated thermistor sensor disables fast-charging when the temperature exceeds the safe operating range; a battery-restart-charge threshold prevents overcharging.

The MAX8672 manages backup switchover from a primary power source. An accurate, on-chip voltage detector monitors the main supply and backs up two system supplies (typically I/O and memory) when the main power source falls below the preset voltage. The backup cells are stepped up by an on-chip, synchronous-rectified, low-quiescent-current boost converter; a low-quiescent-current LDO generates a second backup voltage. Additionally, the device does not require external diodes or FETs to prevent reverse currents on the backup-battery, boost, and LDO pins.

The MAX8672 is available in a 3-by-3mm, 14-pin TDFN package and is specified for the extended temperature range (-40°C to 85°C). Prices start at Rs.85.12 ($1.87) (1000-up, FOB USA). An evaluation kit is available to speed designs.

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