Date: 10/06/2010

New monolithic buck type 2A battery charger IC from Linear

Linear Technology has introduced the LT3652HV, a higher voltage version of the LT3652 monolithic buck type battery charger for modern battery chemistries. It 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 can 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.

According to Steve Pietkiewicz, Vice President and General Manager of Power Products, "The LT3652HV, with its increased output voltage capability, is a welcome addition to our growing line of solar input compatible battery charger ICs. Like the LT3652, its simple but unique input voltage regulation loop circuitry delivers virtually the same charging efficiency as more complex and expensive Maximum Peak Power Tracking (MPPT) techniques."

The LT3652HV has an input voltage range from 4.95V to 34V with a 40V absolute maximum rating for added system margin. The input voltage regulation loop also allows charging from poorly regulated sources where the input can collapse under overcurrent conditions. It charges a variety of battery pack configurations such as 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. It is suggested for solar-powered systems, 12V to 24V automotive equipment and battery chargers applications. It has a charge current 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. It has a switching frequency of 1MHz. It has a float voltage feedback accuracy is specified at 0.5%, charge current accuracy at 5% and C/10 detection accuracy at ±2.5%. Once charging is terminated, the LT3652HV automatically enters a low current standby mode, which reduces the input supply current to 85uA. In shutdown, the input bias current is reduced to 15uA. 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.

Package: a low-profile (0.75mm) 12-pin 3mm x 3mm DFN, 12-lead MSOP.

Operating temperature range: -40degC to 125degC


Price:
E-grade version starts at US$3.40 for 1,000-piece quantities.
I-grade version starts at US$3.70 for 1,000-piece quantities.

For more information visit: http://www.linear.com/pr/3652