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Batteries and chargers

Battery charger minimises power dissipation

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By Linear Technology now part of Analog Devices on 25th February 201115th December 2015

Product Details Supplier Info More products

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LT3651-4.2 Charger - .PDF file.

Linear Technology has introduced the LT3651-4.2, a 4A monolithic synchronous buck battery charger for one-cell li-ion/polymer batteries used in industrial hand-held instruments and notebook computers.

The LT3651-4.2 accepts inputs up to 32V with a 40V absolute maximum rating for added system margin.

Charge current is programmable and dynamically adjustable up to 4A; fully integrated synchronous power devices minimise power dissipation and save board space.

User-selectable timer or C/10 termination requires no external microcontroller and simplifies the design.

The LT3651-4.2 does not require external high-precision resistors to set the float voltage, further saving cost and space.

Applications include industrial hand-held instruments, 12V to 24V automotive and heavy equipment applications, desktop cradle chargers and notebook or tablet computers.

The programmable switching frequency (200kHz to 1MHz) of the LT3651-4.2 enables the designer to balance solution size, power loss and filtering needs.

Synchronous operation enables charging efficiencies as high as 90 per cent.

Final float voltage accuracy is +0.5 per cent, charge current accuracy is +7.5 per cent and C/10 detection accuracy is +4 per cent.

Once charging is terminated, the LT3651-4.2 automatically enters a low current standby mode, which reduces the input supply current to 80uA.

In shutdown the input bias current is reduced to 15uA.

The LT3651-4.2 maximises battery life during all non-charging periods by draining

For safety and autonomous charge control, the device includes: 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 LT3651-4.2 is available in a low-profile (0.75mm) 36-pin 5 x 6mm QFN package, and is offered in both E and I grade versions, guaranteed from -40C to 125C.

Pricing starts at $4.13 and $4.75 each, respectively, in 1,000-piece quantities.

Two-cell 8.2V and 8.4V options and a one-cell 4.1V version are planned for release within the next few months.

Linear Technology now part of Analog Devices

Analog Devices (NASDAQ: ADI) is the leading global high-performance analog technology company dedicated to solving the toughest engineering challenges.

Contact Supplier Visit our website 01628 477066

About Analog Devices
Analog Devices (NASDAQ: ADI) is the leading global high-performance analog technology company dedicated to solving the toughest engineering challenges. We enable our customers to interpret the world around us by intelligently bridging the physical and digital with unmatched technologies that sense, measure, power, connect and interpret. Visit http://www.analog.com

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