Overview
The LTC4425IMSE#TRPBF is a linear supercapacitor charger integrated circuit (IC) designed by Analog Devices Inc. This device is optimized for charging 2-cell supercapacitor stacks from a Li-Ion/Polymer battery or other voltage sources. It features a constant-current/constant-voltage charging profile, making it suitable for a variety of power management applications. The LTC4425 is available in a 12-lead MSOP package and operates over a wide temperature range of –40°C to 125°C, ensuring reliability in diverse environmental conditions.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 12-Lead Plastic MSOP |
| Operating Temperature Range | –40°C to 125°C |
| Storage Temperature Range | –65°C to 150°C |
| Top Shunt Current (ISH(TOP)) | 160 mA (RPROG = 1k, (VOUT – VMID) > VCLAMP) |
| Bottom Shunt Current (ISH(BOT)) | 140 mA (RPROG = 1k, VMID > VCLAMP) |
| Logic Low Input Voltage (VIL) | 0.4 V |
| Logic High Input Voltage (VIH) | 1.2 V |
| Input Current High (IIH) | –1 to 1 µA (EN, SEL Pins at 5.5V) |
| Input Current Low (IIL) | –1 to 1 µA (EN, SEL Pins at GND) |
| Power Good Timer Delay | 200 ms |
Key Features
- Constant-current/constant-voltage linear charging profile
- Current-limited ideal diode and V/I monitor
- Programmable charge current using an external RPROG resistor
- Thermal foldback to reduce charge current and power dissipation
- Open-drain outputs for power fail and power good indications
- Operating modes include charge current profile mode and normal mode
- Wide operating temperature range of –40°C to 125°C
Applications
The LTC4425IMSE#TRPBF is suitable for various applications requiring efficient and reliable supercapacitor charging. These include:
- Backup power systems
- Energy harvesting systems
- Power management in industrial and automotive systems
- Battery backup and power fail protection in electronic devices
- Renewable energy systems and solar-powered devices
Q & A
- What is the primary function of the LTC4425IMSE#TRPBF? The primary function is to charge 2-cell supercapacitor stacks from a Li-Ion/Polymer battery or other voltage sources.
- What is the operating temperature range of the LTC4425IMSE#TRPBF? The operating temperature range is –40°C to 125°C.
- How is the charge current programmed in the LTC4425IMSE#TRPBF? The charge current is programmed using an external RPROG resistor.
- What are the key protection features of the LTC4425IMSE#TRPBF? Key protection features include current-limited ideal diode, thermal foldback, and power good/power fail indications.
- What package type is the LTC4425IMSE#TRPBF available in? It is available in a 12-lead Plastic MSOP package.
- What are some typical applications of the LTC4425IMSE#TRPBF? Typical applications include backup power systems, energy harvesting systems, and power management in industrial and automotive systems.
- How does the thermal foldback feature work in the LTC4425IMSE#TRPBF? The thermal foldback feature reduces the charge current to limit power dissipation within the chip as the temperature increases.
- What is the purpose of the open-drain outputs in the LTC4425IMSE#TRPBF? The open-drain outputs are used for power fail and power good indications.
- Can the LTC4425IMSE#TRPBF be used in renewable energy systems? Yes, it can be used in renewable energy systems and solar-powered devices.
- What is the storage temperature range for the LTC4425IMSE#TRPBF? The storage temperature range is –65°C to 150°C.
