Contact Us

Tianjin Shengjie Technology Development Co.,Ltd.

Add. 10#, Jianshe Road, BaLiTai industrial zone, Jinnan District, Tianjin, China

Tel:+86-022-28752273

Fax:+86-022-28752273

Web:www.aussda.com

Search
Position:Home > News > Company News

12V80Ah battery charging controller actively finds true maximum power point in solar panels

2013-12-4 22:17:32 Viewers:

Linear Technology Corporation has released a synchronous buck-boost battery charging controller for lead acid and Lithium batteries which features automatic maximum power point tracking (MPPT) and temperature compensation.


The LT8490 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 6 V to 80 V input voltage range and can produce a 1.3 V to 80 V battery float voltage output using a single inductor with 4-switch synchronous rectification. The device is capable of charging currents as high as 10 A 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 environments.

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 one or two 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 3.3 V regulated LDO output, status pins and a synchronizable fixed switching frequency.

The LT8490 is targeting a variety of applications including off-grid solar/battery-powered equipment, LED lighting and oil well monitoring as well as road traffic messaging.



Availability and Pricing

The LT8490 is available in a low profile (0.75 mm) 64-pin 7 mm x 11 mm QFN package. The device is offered in both E and I grades which are guaranteed for operation from -40C to 125C. 1,000-piece pricing for the E grade starts at $10.35 each.