LTC3350IUHF

Power Management - Specialized Overview

The LTC3350IUHF is a high-current backup power controller designed for charging and monitoring series stacks of one to four supercapacitors. It features a wide 4.5V to 35V input voltage range and supports over 10A of charge/backup current capability. The device utilizes a synchronous step-down controller to drive N-channel MOSFETs for constant current/constant voltage charging at up to 5V per cell. In backup mode, it operates as a synchronous step-up DC/DC converter to deliver power from the capacitor stack to the system supply. An integrated 14-bit ADC continuously monitors input/output voltage and current, while also measuring capacitor stack voltage, capacitance, and equivalent series resistance (ESR) via an I²C interface.

Power Management - Specialized Feature Summary

• Synchronous step-down controller drives external N-channel MOSFETs for efficient constant current/constant voltage charging of supercapacitor stacks.
• Reversible synchronous step-up DC/DC operation provides low-loss backup power delivery from capacitors to the system supply.
• Dual ideal diode controllers manage power paths with minimal loss between input sources and backup supplies.
• Integrated 14-bit analog-to-digital converter enables continuous monitoring of electrical parameters and capacitor health metrics.

Power Management - Specialized Applications

• High current 12V ride-through supplies
• Short-term uninterruptible power supplies (UPS) for servers
• Mass storage systems requiring backup power
• High availability industrial systems

Power Management - Specialized Procurement Notes

Verify the specific suffix (e.g., #PBF or #TRPBF) against the required packaging format, as the base part number may be offered in tube or tape-and-reel configurations. Confirm that the operating temperature grade matches the application environment, as automotive-grade variants exist within the family. Ensure the input voltage range aligns with the source supply before finalizing the order.

Power Management - Specialized Selection Notes

Select this component when designing systems requiring high-current backup for supercapacitor stacks rather than batteries. The choice depends on the need for precise capacitance and ESR monitoring to extend component life. Consider the maximum input voltage and required backup current capacity relative to the load profile. The I²C interface requirement for system integration must be accounted for in the design architecture.

Power Management - Specialized Part Context

The LTC3350 belongs to Analog Devices' line of backup power managers. It is distinct from battery chargers by its focus on supercapacitor series balancing and health monitoring. The IUHF designation indicates a specific package type suitable for surface-mount applications. It serves as a critical interface between energy storage elements and the main system bus during power interruptions.

Power Management - Specialized Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The LTC3350EUHF shares similar functional descriptions but may differ in package or temperature rating; verify datasheet compatibility before substitution. No other direct cross-model replacements are explicitly listed.