Overview
The LT8491EUKJ#PBF, produced by Analog Devices Inc., is a high-voltage buck-boost switching regulator battery charger. It implements 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 device can operate from input voltages above, below, or equal to the output voltage and can be powered by a solar panel or a DC power supply. It also features automatic maximum power point tracking (MPPT) for solar-powered applications and supports I2C communication for configuration and monitoring.
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 |
| Operating Junction Temperature Range | –40°C | 125°C | |||
| Storage Temperature Range | –65°C | 150°C | |||
| PWM Frequency (OSC2) | 31.25 kHz | ||||
| PWM Resolution | 8 bits | ||||
| Internal A/D Resolution | 10 bits |
Key Features
- Constant-current constant-voltage (CCCV) charging profile for various battery types including SLA, flooded, gel, and lithium-ion batteries.
- High-voltage buck-boost switching regulator capable of operating from input voltages above, below, or equal to the output voltage.
- Automatic maximum power point tracking (MPPT) for solar-powered applications.
- I2C interface for configuration and monitoring.
- Automatic temperature compensation using an external thermistor.
- STATUS pin for driving an LED indicator lamp.
- Low profile 64-lead QFN package (7mm × 11mm).
- Operating junction temperature range: –40°C to 125°C.
Applications
- Solar-powered battery charging systems.
- DC power supply-based battery charging systems.
- Battery management systems for industrial, automotive, and renewable energy applications.
- Charging systems for sealed lead-acid, flooded, gel, and lithium-ion batteries.
- Energy harvesting and storage systems.
Q & A
- What is the operating voltage range of the LT8491EUKJ#PBF?
The operating voltage range is from 6V to 80V.
- What types of batteries can the LT8491EUKJ#PBF charge?
The device can charge sealed lead-acid (SLA), flooded, gel, and lithium-ion batteries.
- Does the LT8491EUKJ#PBF support maximum power point tracking (MPPT)?
Yes, it supports automatic MPPT for solar-powered applications.
- What is the PWM frequency of the LT8491EUKJ#PBF?
The PWM frequency is 31.25 kHz.
- What is the internal A/D resolution of the LT8491EUKJ#PBF?
The internal A/D resolution is 10 bits.
- How does the LT8491EUKJ#PBF handle temperature compensation?
The device performs automatic temperature compensation using an external thermistor.
- What is the package type and dimensions of the LT8491EUKJ#PBF?
The device is available in a 64-lead QFN package with dimensions of 7mm × 11mm.
- What is the operating junction temperature range of the LT8491EUKJ#PBF?
The operating junction temperature range is from –40°C to 125°C.
- Does the LT8491EUKJ#PBF have an I2C interface?
Yes, it has an I2C interface for configuration and monitoring.
- What is the purpose of the STATUS pin on the LT8491EUKJ#PBF?
The STATUS pin can be used to drive an LED indicator lamp.
