Overview
The LT8491EUKJ#TRPBF, produced by Analog Devices Inc., is a high-voltage buck-boost switching regulator battery charger. This device is designed to implement a constant-current constant-voltage (CCCV) charging profile, making it suitable for various battery types including sealed lead-acid (SLA), flooded, gel, and lithium-ion batteries. The LT8491 operates from input voltages that can be above, below, or equal to the output voltage, and it can be powered by a solar panel or a DC power supply. It also features on-chip logic for automatic maximum power point tracking (MPPT) in solar-powered applications and supports automatic temperature compensation using an external thermistor thermally coupled to the battery.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| VIN Operating Voltage Range | 6 | 80 | V | ||
| VIN Quiescent Current (Not Switching, VEXTVCC = 0, VDD = AVDD = Float) | 2.65 | 4.2 | mA | ||
| VIN Quiescent Current in Shutdown (VSHDN = 0V) | 0 | 1 | µA | ||
| VDD Quiescent Current (IAVDD + IVDD, VDD = AVDD = 3.3V) | 2.5 | 4 | 6.5 | mA | |
| EXTVCC Switchover Voltage (IINTVCC = 20mA, VEXTVCC Rising) | 6.15 | 6.4 | 6.6 | V | |
| PWM Frequency (OSC2) | 31.25 | kHz | |||
| PWM Resolution | 8 bits | ||||
| Internal A/D Resolution | 10 bits | ||||
| Operating Junction Temperature Range | –40°C | 125°C | |||
| Storage Temperature Range | –65°C | 150°C |
Key Features
- Constant-current constant-voltage (CCCV) charging profile for various battery types including SLA, flooded, gel, and lithium-ion batteries.
- Operates from input voltages above, below, or equal to the output voltage.
- Powered by a solar panel or a DC power supply.
- On-chip logic for automatic maximum power point tracking (MPPT) in solar-powered applications.
- Automatic temperature compensation using an external thermistor thermally coupled to the battery.
- I2C interface for communication and control.
- Single inductor design.
- Low profile 64-lead QFN package (7mm × 11mm).
Applications
The LT8491EUKJ#TRPBF is suitable for a variety of applications, including:
- Solar-powered battery charging systems.
- Industrial battery charging and maintenance.
- Automotive battery management systems.
- Renewable energy systems.
- Backup power systems.
Q & A
- What is the operating voltage range of the LT8491?
The LT8491 operates from an input voltage range of 6V to 80V. - What types of batteries can the LT8491 charge?
The LT8491 can charge sealed lead-acid (SLA), flooded, gel, and lithium-ion batteries. - Does the LT8491 support maximum power point tracking (MPPT)?
Yes, the LT8491 features on-chip logic for automatic MPPT in solar-powered applications. - How does the LT8491 handle temperature compensation?
The LT8491 supports automatic temperature compensation using an external thermistor thermally coupled to the battery. - What is the PWM frequency of the LT8491?
The PWM frequency of the LT8491 is 31.25 kHz. - What is the internal A/D resolution of the LT8491?
The internal A/D resolution of the LT8491 is 10 bits. - What is the operating junction temperature range of the LT8491?
The operating junction temperature range of the LT8491 is –40°C to 125°C. - What package type is the LT8491 available in?
The LT8491 is available in a low profile 64-lead QFN package (7mm × 11mm). - Does the LT8491 support I2C communication?
Yes, the LT8491 supports I2C interface for communication and control. - What are some common applications of the LT8491?
The LT8491 is commonly used in solar-powered battery charging systems, industrial battery charging, automotive battery management, renewable energy systems, and backup power systems.
