Electronic Design

Li-Ion Charging IC Holds Down Heat Dissipation

Minimizing heat dissipation without compromising board space, the LTC4001 is a switch-mode battery charger for single-cell, 4.2-V lithium-ion/lithium-polymer cells. The IC’s standalone operation eliminates the need for an external microprocessor for charge termination. Automatic shutdown, battery preconditioning, a thermistor input for temperature-qualified charging, and remote sensing facilitate safety as well as autonomous charge control. End-of-charge indication and a programmable charge-termination timer also are included.

Intended for use with 5-V wall-adapter input power, the device suits handheld medical devices, handheld computers, charging docks and cradles, digital cameras, and smart phones. Its synchronously rectified, buck-switching topology yields efficiencies as high as 90 percent at 1.5 A. Final float-voltage accuracy is specified at 1 percent with charge-current accuracy of 10 percent. The LTC4001 comes in a compact 16-lead, low-profile (0.75 mm) 4- by 4-mm quad flat no-lead (QFN) package, and it’s guaranteed for operation from –40°C to 85°C.

Pricing starts at $2.20 each in quantities of 1000.

Linear Technology Corp.

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