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Linear Technology Release Lead Acid Charging Controller with True MPPT
The LT8490's full-featured battery charger offers many selectable constant-current constant-voltage (CC-CV) charging profiles
Linear Technology Corporation has released the new LT8490, a synchronous buckboost
battery charging controller for lead acid and Lithium batteries, featuring automatic maximum power point
tracking (MPPT) and temperature compensation. The device operates from input voltages above, below or equal to
the regulated battery float voltage. The LT8490's full-featured battery charger offers many selectable constant-current
constant-voltage (CC-CV) charging profiles, making it ideal for charging a variety of Lithium or lead acid chemistry
types, including sealed lead acid, gel cells and flooded cells. All charge termination algorithms are provided onboard,
eliminating the need for software or firmware and thus reducing design cycle time.
The LT8490 operates over a wide 6V to 80V input voltage range and can produce a 1.3V to 80V battery float voltage
output using a single inductor with 4-switch synchronous rectification. The device is capable of charging currents as
high as 10A depending on the choice of external FETs. The LT8490's MPPT circuit enables a sweep of the full
operating range of a solar panel, finding the true maximum power point, even in the presence of local maxima points
caused by partial shading of the panel. Once the true maximum power point is found, the LT8490 will operate at that
point while using a dithering technique to quickly track changes in the local maximum power point. With this
methodology, the LT8490 fully utilizes the power generated by a solar panel even in non ideal operating
The LT8490 performs automatic temperature compensation of the battery charge voltage by sensing an external
thermistor on the battery. The STATUS and FAULT pins can be used to drive LED indicator lamps.
Charging current limits can be adjusted by changing as few as 1 or 2 resistors, and a
charging time scale can be selected with the appropriate resistor divider.
Other features of the device include: input and charge current limit pins, a 3.3V regulated LDO output,
status pins and a synchronizable fixed switching frequency.
Key Features of the LT8490
- VIN Range 6V to 80V
- VBAT Range 1.3V to 80V
- Single Inductor Allows VIN Above, Below, or Equal to VBAT
- Automatic Sweeps to Find True MPPT Point
- Support of Many Types of Lead Acid & Lithium Battery Types
- LED Drivers for Status Indication
- Battery Charging Algorithms Built-in
- Automatic Float Voltage Temperature Compensation
- Input & Output Current Monitor Pins
- Synchronizable Fixed Frequency: 100kHz to 400kHz
The company's Web site address is www.linear.com.
[Reprinted with kind permission from Linear Technology - Release Date: 2nd December, 2013]