Evaluation Kit for the MAX8672 (MAX8672EVKIT) (MAX8672EVKIT)The MAX8672 evaluation kit (EV kit) is a fully assembled and tested PCB that evaluates the MAX8672 backup-management IC for NiMH batteries. The MAX8672 EV kit charges one- or two-cell NiMH batteries, with the EV kit configured for two-cell applications. Maximum battery-charge voltage, standard-charge current, and trickle-charge current are preprogrammed to 3V, 3mA, and 450µA, respectively, using external resistors. The programmable charge timer is set to 480 minutes. An adjustable battery undervoltage-lockout (UVLO) threshold is preset to 1.6V and shuts down battery-backup functions.
To support system-supply voltages, the MAX8672 EV kit provides two outputs. Low-voltage backup cells are stepped up to a fixed 3.05V by a low quiescent-current synchronous-rectified step-up DC-DC converter capable of delivering up to 20mA. A low-dropout (LDO) output is set to 1.75V and is capable of providing up to 20mA. The LDO output voltage is adjustable with external resistors.
The MAX8672 EV kit also features a thermistor input to monitor battery temperature (negative temperature coefficient (NTC) thermistor not included). To simulate a 100kΩ thermistor at TA = +25°C, the EV kit comes with a 100kΩ resistor installed. See the Thermistor Monitor section for details.
The MAX8672 EV kit comes fully assembled and tested and has an operating temperature range of -40°C to +85°C.