Power Electronics

High Voltage 2A Battery Charger Matches Solar Cell Peak Power Tracking

Linear Technology Corporation introduces the LT3652HV, a higher voltage version of the innovative LT3652 monolithic buck battery charger for modern battery chemistries. The LT3652HV offers a wider battery float voltage range than the LT3652 - up to 18V - and features the same input voltage regulation loop that controls charge current to hold the input voltage at a programmed level. The LT3652HV has the flexibility to charge many different battery configurations from various input supplies, and when it is connected to a solar panel, the input regulation loop maintains the panel at peak output power.

The LT3652HV accepts a wide range of inputs from 4.95V to 34V with a 40V absolute maximum rating for added system margin. The input voltage regulation loop also allows optimized charging from poorly regulated sources where the input can collapse under overcurrent conditions. It charges a variety of battery pack configurations, including 1 to 4 Li-Ion / Polymer cells in series, 1 to 5 LiFePO4 (Lithium Iron Phosphate) cells in series and sealed lead acid (SLA) batteries up to 18V. Applications include solar-powered systems, 12V to 24V automotive equipment and battery chargers.

The LT3652HV's charge current is programmable up to 2A. This stand-alone battery charger requires no external microcontroller and features user-selectable termination, including C/10 or an onboard timer. The device's 1MHz fixed switching frequency enables small solution sizes. Float voltage feedback accuracy is specified at ±0.5%, charge current accuracy is ±5% and C/10 detection accuracy is ±2.5%. Once charging is terminated, the LT3652HV automatically enters a low current standby mode, which reduces the input supply current to 85µA. In shutdown, the input bias current is reduced to 15µA. For autonomous charge control, an auto-recharge feature starts a new charging cycle if the battery voltage falls 2.5% below the programmed float voltage.

The LT3652HV is available in thermally enhanced packages: a low-profile (0.75mm) 12-pin 3mm x 3mm DFN package, and a 12-lead MSOP package. Both are available in E- and I- grade versions, guaranteed from -40ºC to 125ºC. Pricing starts at $3.40 and $3.70 each, respectively in 1,000-piece quantities.

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