LTC3350EUHF#PBF, Switching Controllers Hi C Supercap Backup Cntr & S Mon

LTC®3350 is a backup power controller that can charge and monitor a series stack of one to four super capacitors. This synchronous step-down controller drives N-channel MOSFETs for constant current/constant voltage charging with programmable input current limit. In addition, the step-down converter can run in reverse as a step-up converter to deliver power from the super capacitor stack to the backup supply rail. Internal balancers eliminate the need for external balance resistors and each capacitor has a shunt regulator for overvoltage protection. The LTC3350 monitors system voltages, currents, stack capacitance and stack ESR which can all be read over the I2C/SMBus. The dual ideal diode controller uses N-channel MOSFETs for low loss power paths from the input and supercapacitors to the backup system supply. Typical applications are high current 12V ride-through UPS, servers/mass storage/high availability systems.

• High efficiency synchronous step-down CC/CV, charging of one to four series super capacitors
• Step-up mode in backup provides greater, utilization of stored energy in super capacitors
• 14bit ADC for monitoring system voltages/currents, capacitance and ESR
• Active overvoltage protection shunts, internal active balancers-no balance resistors
• Programmable input current limit prioritizes system load over capacitor charge current
• Dual ideal diode PowerPath™ controller, all N-FET charger controller and PowerPath controller
• Input supply voltage range from 4.5 to 35V (TA=25°C. VIN=VOUT=12V, VDRVCC=VINTVCC)
• Input quiescent current is 4mA
• 38-lead plastic QFN package
• Temperature rating range from -40°C to 125°C