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Automotive & Transportation

60 V Synchronous Buck Battery Charger Handles Lead-Acid, Li-Ion Types

07 September 2016

Linear Technology Corp. has introduced the LTC4013, a highly integrated, high voltage multi-chemistry synchronous step-down battery charger controller. With a wide input voltage range that spans up to 60 V, the LTC4013 uses temperature-compensated 3 and 4-stage charge algorithms to efficiently charge 12 V and 24 V lead-acid batteries.

LTC4013 step-down battery charger. Source: Linear Technology. LTC4013 step-down battery charger. Source: Linear Technology.

Alternatively, the LTC4013 will charge a multicell Lithium-based battery stack with float voltages near to the input supply. Mode pins define the float voltage and charge algorithm. Charge current is precision regulated to ±5% and programmable with a single resistor up to 20 A (depending on the selection of external components).

The LTC4013 features user-adjustable maximum power point tracking (MPPT) circuitry that enables simple power optimization in the case of power-limited sources such as solar panels. The MPPT open-circuit method corrects for panel temperature changes without the inconvenience of adding a solar panel temperature sensor.

The charger utilizes N-channel MOSFETs for high-efficiency charging, and features a wide battery charge voltage range of 0 V to 60 V. The main charging features of the product can be adjusted using pin-strap configurations and programming resistors, enabling the user to select between several predefined charging algorithms depending on battery chemistry.

For lead-acid battery types such as vented, sealed and gel, the charger supports multiple charging stages, including float, programmable-timed absorption and equalization. Each charge voltage includes adjustable temperature compensation. For Li-Ion/Polymer cells, the device offers a constant-current/constant-voltage charging algorithm. The SYNC input provides the ability to synchronize the switching frequency to an external clock to avoid noise in a particular frequency range or to target noise filters to a specific frequency.

Other features include an external input MOSFET driver (INFET) to avoid battery discharge during an input supply short, two open-drain status pins, and an ISMON pin that provides analog information about charge current.

The LTC4013 comes in a compact 28-lead, 4 mm x 5 mm QFN package with an exposed metal pad for excellent thermal performance. E- and I-grade devices are guaranteed for operation from –40 C to 125 °C. 1,000-piece pricing starts at $3.95 each for the E-grade and devices are available from stock.



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