Overview
The LTC3350EUHF#PBF, 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 ideal for backup power applications. The LTC3350 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.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| VIN Input Supply Voltage | 4.5 | 35 | V | ||
| IQ Input Quiescent Current | 4 | mA | |||
| Operating Temperature | -40 | 125 | °C | ||
| Package | 38-WFQFN Exposed Pad | ||||
| VPFI(TH) PFI Input Threshold (Falling Edge) | 1.147 | 1.17 | 1.193 | V | |
| INFET Rise Time | INFET – VIN > 3V, CINFET = 3.3nF | 560 | µs | ||
| OUTFET Rise Time | OUTFET – VCAP > 3V, COUTFET = 3.3nF | 0.13 | µs |
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.
- Each capacitor has a shunt regulator for overvoltage protection.
- Dual ideal diode controller using N-channel MOSFETs for low loss power paths.
- Monitors system voltages, currents, stack capacitance, and stack ESR via I2C/SMBus interface.
- Overtemperature protection to protect the device during momentary overload conditions.
Applications
The LTC3350 is suitable for various backup power applications, including but not limited to:
- Supercapacitor-based backup systems.
- Power backup in industrial and automotive systems.
- Energy storage and recovery systems.
- Systems requiring high reliability and monitoring of supercapacitor stacks.
Q & A
- What is the primary function of the LTC3350?
The LTC3350 is a backup power controller designed to charge and monitor a series stack of one to four supercapacitors. - What is the input voltage range of the LTC3350?
The input voltage range is from 4.5V to 35V. - What type of MOSFETs does the LTC3350 use?
The LTC3350 uses N-channel MOSFETs for constant current/constant voltage charging and step-up conversion. - Does the LTC3350 have overtemperature protection?
Yes, the LTC3350 includes overtemperature protection to safeguard the device during momentary overload conditions. - How does the LTC3350 monitor the supercapacitor stack?
The LTC3350 monitors system voltages, currents, stack capacitance, and stack ESR via the I2C/SMBus interface. - What is the operating temperature range of the LTC3350?
The operating temperature range is from -40°C to 125°C. - What package type is the LTC3350 available in?
The LTC3350 is available in a 38-WFQFN Exposed Pad package. - Can the LTC3350 be used in automotive applications?
Yes, versions of the LTC3350 designated with a #W suffix are available to support the quality and reliability requirements of automotive applications. - What is the purpose of the internal balancers in the LTC3350?
The internal balancers eliminate the need for external balance resistors. - How does the LTC3350 protect against overvoltage?
Each capacitor has a shunt regulator for overvoltage protection.
