LTC3350EUHF#PBF Description

The LTC3350EUHF#PBF is a backup power controller that can charge and monitor a series stack of one to four supercapacitors. The LTC3350EUHF#PBF’s 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 supercapacitor 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. 

LTC3350EUHF#PBF Features

High-Efficiency Synchronous Step-Down CC/CV Charging of One to Four Series Supercapacitors

Step-Up Mode in Backup Provides Greater Utilization of Stored Energy in Supercapacitors

14-Bit ADC for Monitoring System Voltages/ Currents, Capacitance and ESR

Active Overvoltage Protection Shunts

Internal Active Balancers—No Balance Resistors

VIN: 4.5V to 35V, VCAP(n): Up to 5V per Capacitor, Charge/Backup Current: 10+A

Programmable Input Current Limit Prioritizes System Load Over Capacitor Charge Current

Dual Ideal Diode PowerPath™ Controller

All N-FET Charger Controller and PowerPath Controller

Compact 38-Lead 5mm × 7mm QFN Package

AEC-Q100 Qualified for Automotive Applications

LTC3350EUHF#PBF Applications

High Current 12V Ride-Through UPS

Servers

Mass Storage

High Availability Systems