LT8491

High Voltage Buck-Boost Battery Charge Controller with Maximum Power Point Tracking (MPPT) and I²C

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Overview

Features and Benefits
Product Details

Features and Benefits

V_IN Range: 6V to 80V
V_BAT Range: 1.3V to 80V
Single Inductor Allows V_IN Above, Below, or Equal to V_BAT
Automatic MPPT for Solar Powered Charging
Automatic Temperature Compensation
I²C Telemetry and Configuration

Internal EEPROM for Configuration Storage
Operation from Solar Panel or DC Supply
Four Integrated Feedback Loops
Synchronizable Fixed Frequency: 100kHz to 400kHz
64-Lead (7mm × 11mm × 0.75mm) QFN Package

Product Details

The LT8491 is a buck-boost switching regulator battery charger that implements a constant-current constant-voltage (CCCV) charging profile used for most battery types, including sealed lead-acid (SLA), flooded, gel and lithium-ion.

The device operates from input voltages above, below or equal to the output voltage and can be powered by a solar panel or a DC power supply. On-chip logic provides automatic maximum power point tracking (MPPT) for solar powered applications. The LT8491 can perform automatic temperature compensation by sensing an external thermistor thermally coupled to the battery. The STATUS pin can be used to drive an LED indicator lamp. The device is available in a low profile (0.75mm) 7mm × 11mm 64-lead QFN package.

Applications

Solar Powered Battery Chargers
Multiple Types of Lead-Acid Battery Charging
Li-Ion Battery Charger
Battery Equipped Industrial or Portable Military Equipment

Product Categories

Power Management

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Product Lifecycle Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

DC2703A-A-KIT

LT8491 Demo Board | High Voltage Buck-Boost Battery Charge Controller with Maximum Power Point Tracking (MPPT) and I²C

DC2703A-A-KIT

View Detailed Evaluation Kit Information

The DC2703A-A-KIT contains the DC2703A (LT8491demo board) and DC1613A (USB-to-I²C controller). Together they provide a high performance buck-boost battery charger converter with an I²C interface. The LT8491 implements a maximum power point tracking (MPPT) function and flexible charging profiles, suitable for most battery types such as flooded and sealed lead acid batteries and Li-Ion batteries. A Microsoft Windows-Based GUI (Graphical User Interface) application called “simpleLT8491” is provided which can be downloaded here.

The DC2703A-A-KIT demo board is configured for 17V to 54V input voltage range and the power source can be a solar panel with 36 to 72 cells (up to 200W) or a DC voltage source. The LT8491 converter can operate from input voltages above, below or equal to the battery voltage. Two input connectors are provided. An ideal diode controller LTC4359 protects the DC power supply output from being back fed from the solar panel. This allows, for example, a 24VDC supply to be plugged in while a solar panel with higher voltage is being used to power the circuit. The DC2703A-A-KIT demo board output is set up for charging a 12V SLA battery with up to 16.6A charge current. The DC2703A-A-KIT demo board can be modified to support much higher output voltage, with modifications including higher voltage rating output side MOSFETs and capacitors.

The LT8491 includes a slave I²C compatible interface for digital control of the charger settings and digital readouts of charger telemetry and status. A Microsoft Windows- Based GUI (Graphical User Interface) application is provided for this demo board, which makes it very easy to read charger telemetry and status data, as well as the ability to change the charging algorithm by writing to the appropriate configuration registers. The LT8491 EEPROM on the DC2703A-A-KIT demo board is programmed with the onboard resistor values to accurately read charger telemetry and status registers data.

On-chip logic provides automatic true power point tracking (MPPT) for solar powered applications. The MPPT function not only continuously tracks the maximum power point, but also periodically sweeps the input panel voltage in order to select the correct maximum on the power curve. In doing so, an increase in power harvested from the panel during partial shade conditions is possible when multiple peaks occur on the power curve. During periods of low light, a low power mode allows the charger to deliver a small charge current even if there is not enough light for the MPPT function to operate.

An RJ25 modular jack can be used to connect an external NTC temperature sensor mounted at the battery. This allows temperature compensation of the charge voltage, which is important for lead acid batteries. The same connector can be used for remote sensing of battery voltage, to compensate for voltage drops in long battery cables. The onboard LED displays the charge state.

The LT8491 data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual for DC2703A-A-KIT. The LT8491EUKJ is assembled in a 64-lead (7mm × 11mm) plastic QFN package with a thermal pad underneath the chip. Proper board layout is essential for maximum thermal performance.

Resources

Software

Documentation & Resources

Data Sheets

LT8491: High Voltage Buck-Boost Battery Charge Controller with Maximum Power Point Tracking (MPPT) and I^{2^{C Data Sheet (Rev. 0)}}
1/23/2020
PDF

Reliability Data

R541 Reliability Data
3/26/2018
PDF

Software & Systems Requirements

Evaluation Software

ZIP

5.1 K

LT8491 Linduino I²C Interface

ZIP

4.13 M

Simple LT8491 User Interface

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
LT8491EUKJ#PBF	Material Declaration	Reliability Data	64(58)-Lead Plastic QFN (7mm × 11mm)	Ultra Librarian SamacSys
LT8491EUKJ#TRPBF	Material Declaration	Reliability Data	64(58)-Lead Plastic QFN (7mm × 11mm)	Ultra Librarian SamacSys
LT8491IUKJ#PBF	Material Declaration	Reliability Data	64(58)-Lead Plastic QFN (7mm × 11mm)	Ultra Librarian SamacSys
LT8491IUKJ#TRPBF	Material Declaration	Reliability Data	64(58)-Lead Plastic QFN (7mm × 11mm)	Ultra Librarian SamacSys
Wafer Fabrication Data		R541 Reliability Data

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

Overview

Features and Benefits

Product Details

Product Categories

Comparable Parts Click to see all in Parametric Search

Product Lifecycle Recommended for New Designs

Evaluation Kits (1)

DC2703A-A-KIT

DC2703A-A-KIT

Resources

Software

Documentation & Resources

Software & Systems Requirements

Evaluation Software

LT8491 Linduino I2C Interface

Simple LT8491 User Interface

Design Resources

Support & Discussions

LT8491 Discussions

Sample & Buy

Ordering FAQs

Buy Now Pricing

List Pricing

Lead Times

Sampling

Evaluation Boards

LT8491 Linduino I²C Interface