Overview
The LTC3350IUHF#PBF is a high-performance backup power controller designed by Analog Devices Inc. This device is specifically engineered to charge and monitor a series stack of one to four supercapacitors. 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 | ||
| Input Quiescent Current (IQ) | 4 | mA | |||
| Switching Frequency | 500 | kHz | |||
| Duty Cycle - Max | 99.5 | % | |||
| Output Voltage | 35 | V | |||
| MAX Output Current | 10 | A | |||
| Minimum Operating Temperature | -40 | °C | |||
| Maximum Operating Temperature | 125 | °C | |||
| Package | WFQFN-38 |
Key Features
- Synchronous step-down controller with constant current/constant voltage charging capability.
- Ability to 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.
- Each capacitor has a shunt regulator for overvoltage protection.
- Monitors system voltages, currents, stack capacitance, and stack ESR, all readable over I2C/SMBus.
- Dual ideal diode controller uses N-channel MOSFETs for low loss power paths.
- Overtemperature protection to protect the device during momentary overload conditions.
Applications
- Backup power systems for critical applications requiring reliable power during main power failures.
- Industrial control systems and automation.
- Medical devices and equipment requiring uninterrupted power supply.
- Automotive systems, especially those requiring high reliability and robustness.
- Data centers and server systems for backup power management.
Q & A
- What is the primary function of the LTC3350IUHF#PBF?
The primary function is to charge and monitor a series stack of one to four supercapacitors, and to deliver power from the supercapacitor stack to the backup supply rail when needed.
- What is the input voltage range of the LTC3350IUHF#PBF?
The input voltage range is from 4.5V to 35V).
- What is the maximum output current of the LTC3350IUHF#PBF?
The maximum output current is 10A).
- Does the LTC3350IUHF#PBF have overtemperature protection?
Yes, it includes overtemperature protection to safeguard the device during momentary overload conditions).
- How does the LTC3350IUHF#PBF monitor the supercapacitor stack?
It monitors system voltages, currents, stack capacitance, and stack ESR, all of which can be read over I2C/SMBus).
- What type of package does the LTC3350IUHF#PBF come in?
The device comes in a WFQFN-38 package).
- Is the LTC3350IUHF#PBF suitable for automotive applications?
Yes, versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications).
- What is the operating temperature range of the LTC3350IUHF#PBF?
The operating temperature range is from -40°C to 125°C).
- Does the LTC3350IUHF#PBF have internal balancers for the supercapacitor stack?
Yes, it includes internal balancers that eliminate the need for external balance resistors).
- How does the LTC3350IUHF#PBF protect against overvoltage?
Each capacitor has a shunt regulator for overvoltage protection).
