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Compact battery charger delivers up to 2A

Posted: 19 Feb 2009 ?? ?Print Version ?Bookmark and Share

Keywords:battery charger? Li-ion polymer? switch?

Linear Technology Corp. has released the LT3650-8.2, a compact, monolithic high-voltage battery charger for 2-cell Li-ion/polymer batteries.

The device features a switch-mode architecture that minimizes power dissipation without compromising board space. The LT3650-8.2 accepts inputs up to 32V and has a 40V absolute maximum rating for added system margin. User-selectable timer or C/10 termination requires no external microcontroller and simplifies the design.

In addition, the charge current is programmable and dynamically adjustable up to 2A; the power device is integrated on chip to save board space. The LT3650-8.2 does not require external high-precision resistors to set the float voltage, further saving cost and space. Applications include industrial handheld instruments, 12V to 24V automotive and heavy equipment, desktop cradle chargers and small notebook or tablet computers.

The LT3650-8.2's high operating frequency of 1MHz and current mode architecture allow the use of small inductors and capacitors, minimizing noise and filtering needs. Final float voltage accuracy is specified at 0.5 percent, charge current accuracy is 5 percent and C/10 detection accuracy is 2.5 percent. Once charging is terminated, the LT3650-8.2 automatically enters a low current standby mode that reduces the input supply current to 85?A. In shutdown, the input bias current is reduced to 15?A. The LT3650-8.2 maximizes battery life during all non-charging periods, draining less than 1?A from the battery. For safety and autonomous charge control, the LT3650-8.2 includes features such as automatic restart and preconditioning, a thermistor input for temperature-qualified charging, programmable input current limit, bad battery detection and binary coded status output pins.

The LT3650-8.2 is available in a compact, low-profile (0.75mm) 12-pin 3mm x 3mm DFN package, and is offered in both E and I grade versions, both operating from -40C to +85C. Pricing starts at $2.80 and $3.22 each, respectively, in 1,000-piece quantities.

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