Linear launches two high-voltage battery chargers
A Linear Technology Corp product story
Edited by the Electronicstalk editorial team Nov 25, 2009
Linear Technology has introduced two compact, monolithic high-voltage battery chargers for single-cell lithium-ion (Li-ion)/polymer batteries.
The LT3650-4.1 and LT3650-4.2 devices' switch-mode architecture minimises power dissipation without compromising board space.
Linear Technology has introduced the LT3650-4.1 and LT3650-4.2, compact, monolithic high-voltage battery chargers for single-cell Li-Ion/Polymer batteries.
The devices operate from 4.75V to 32V and have a 40V absolute maximum rating for added system margin.
User-selectable timer or C/10 termination requires no external microcontroller and simplifies the design.
Charge current is programmable and dynamically adjustable up to 2A; the power device is integrated on chip to save board space.
The LT3650-4.1 and LT3650-4.2 do not require external high-precision resistors to set the float voltage, further saving cost and space.
Applications include industrial handheld instruments, 12-24V automotive and heavy equipment, desktop cradle chargers and small notebook or tablet computers.
The LT3650-4.1 offers a 4.1V battery float voltage, allowing a high-temperature safety margin, while the LT3650-4.2 features a 4.2V final charge voltage for optimised battery runtime.
The chargers' high operating frequency of 1MHz and current-mode architecture allow the use of small inductors and capacitors, minimising noise and filtering needs.
Final float voltage accuracy is specified at +/-0.5 per cent, charge current accuracy is +/-5 per cent and C/10 detection accuracy is +/-2.5 per cent.
Once charging is terminated, the LT3650-4.1 and LT3650-4.2 automatically enter a low-current standby mode that reduces the input supply current to 85uA.
In shutdown, the input bias current is reduced to 15uA.
The devices maximise battery life during all non-charging periods, draining less than 1uA from the battery.
For safety and autonomous charge control, the LT3650-4.1 and LT3650-4.2 include 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 LT3650-4.1 and LT3650-4.2 are housed in compact, low-profile (0.75mm) 12-pin 3 x 3mm DFN packages and are offered in both E- and I-grade versions, both operating from -40C to +85C.
Pricing starts at USD2.80 (GBP1.70) and USD3.22 for the E and I grades respectively, in 1,000-piece quantities.
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Contact Linear Technology Corp
Tel +44 1628 477066
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