Overview
The LTC3350EUHF#TRPBF, manufactured by Analog Devices Inc., is a high-current supercapacitor backup controller and system monitor. This device is designed to charge and monitor a series stack of one to four supercapacitors, making it an integral component for backup power systems. It features a synchronous step-down controller that drives N-channel MOSFETs for constant current/constant voltage charging, with the capability to run in reverse as a step-up converter to deliver power from the supercapacitor stack to the backup supply rail. The LTC3350 also includes internal balancers and shunt regulators for overvoltage protection, ensuring robust and reliable operation.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| VIN Input Supply Voltage | 4.5 | 35 | V | ||
| IQ Input Quiescent Current | 4 | mA | |||
| INFET Rise Time | INFET – VIN > 3V, CINFET = 3.3nF | 560 | µs | ||
| INFET Fall Time | INFET – VIN < 1V, CINFET = 3.3nF | 1.5 | µs | ||
| OUTFET Rise Time | OUTFET – VCAP > 3V, COUTFET = 3.3nF | 0.13 | µs | ||
| OUTFET Fall Time | OUTFET – VCAP < 1V, COUTFET = 3.3nF | 0.26 | µs | ||
| VPFI(TH) PFI Input Threshold (Falling Edge) | 1.147 | 1.17 | 1.193 | V | |
| Operating Junction Temperature Range | -40 | 125 | °C |
Key Features
- Synchronous step-down controller with constant current/constant voltage charging and step-up conversion capability.
- Internal balancers eliminate the need for external balance resistors, and each capacitor has a shunt regulator for overvoltage protection.
- Dual ideal diode controller using N-channel MOSFETs for low loss power paths.
- System monitoring includes input and output voltages, current, stack capacitance, and stack ESR, all readable over I2C/SMBus.
- Short-circuit protected buck converter and adjustable high- and low-voltage undervoltage lockout.
- On-board voltage monitoring and current sensing circuitry along with comprehensive fault reporting capabilities.
- Open drain status pins for system monitoring and power supply diagnostics.
Applications
The LTC3350EUHF#TRPBF is suitable for various applications requiring reliable backup power systems, including:
- Industrial automation and control systems.
- Telecommunication equipment.
- Medical devices.
- Automotive systems (with the #W suffix models supporting automotive reliability requirements).
- Data centers and server systems.
Q & A
- What is the primary function of the LTC3350EUHF#TRPBF?
The primary function is to charge and monitor a series stack of one to four supercapacitors, serving as a backup power controller and system monitor. - What type of MOSFETs does the LTC3350 use?
The LTC3350 uses N-channel MOSFETs for low loss power paths. - What are the key safety features of the LTC3350?
Key safety features include internal balancers, shunt regulators for overvoltage protection, short-circuit protected buck converter, and adjustable high- and low-voltage undervoltage lockout. - How does the LTC3350 monitor system parameters?
The LTC3350 monitors system voltages, currents, stack capacitance, and stack ESR, all of which can be read over I2C/SMBus. - What is the operating junction temperature range of the LTC3350?
The operating junction temperature range is -40°C to 125°C. - Does the LTC3350 support automotive applications?
Yes, models designated with a #W suffix support the quality and reliability requirements of automotive applications. - What is the maximum input supply voltage for the LTC3350?
The maximum input supply voltage is 35V. - How does the LTC3350 handle overtemperature conditions?
The LTC3350 includes overtemperature protection to protect the device during momentary overload conditions. - What type of communication interface does the LTC3350 use for monitoring?
The LTC3350 uses I2C/SMBus for system monitoring and parameter reading. - Are there any specific packages available for the LTC3350?
Yes, the LTC3350 is available in various packages, including the UHF package, and some models are available in 500 unit reels with the #TRMPBF suffix.
