Simplified Block Diagram
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- PDA, Palmtop, and Wireless Handhelds
- Smart Cell Phones
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.