Analog Devices' PMIC is designed for PCIe cards, high-current UPS systems, and server charging and monitoring

     Analog Devices LTC3351 is a synchronous step-down controller that charges and monitors up to four supercapacitors at the same time. The converter drives constant current/constant voltage charging of an N-channel mosfet with programmable input current limits. In addition, the device operates in reverse as a boost converter, sending power from the supercapacitor bank to the backup power rail. An internal balancer eliminates the need for an external balancing resistor, and each capacitor has a shunt regulator for overvoltage protection.

     The LTC3351 monitors system voltage, current, stack capacitance, and ESR, which can be read through I(2)C/SMBus ports. Heat exchange controllers use N-channel MOSFeTs for surge control and low loss paths from input to output. The ideal diode controller uses a low-loss power path from the ultracapacitor to the output using an N-channel MOSFET. The device is in a 44-pin QFN package and operates at temperatures ranging from -40°C to +125°C. The LTC3351 is designed for hot-swappable applications such as PCIe cards, high-current UPS systems and servers.