Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC4002-8.4
Edited by the Electronicstalk Editorial Team on 14 December 2004
Speedy charger chip keeps cells cool
A novel high efficiency stand-alone switch-mode battery charger controller can charge a two-cell 8.4V Li-ion battery at a high rate without compromising board space for heat dissipation.
The LTC4002-8.4 is a high efficiency stand-alone switch-mode battery charger controller that can charge a two-cell 8.4V Li-ion battery at a high rate without compromising board space for heat dissipation For safety and autonomous charge control, the LTC4002-8.4 includes features such as automatic shutdown, battery preconditioning, battery temperature sensing an end-of-charge indicator and a 3-hour charge termination timer
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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This stand-alone charger is offered in two packages: a 3 x 3mm DFN and an 8-lead SOP.
The complete solution size is only 20 x 20mm.
The LTC4002-8.4 is beneficial in applications such as handheld medical devices, industrial and communication test equipment as well as charging docks, tablet PCs and battery backup systems.
The LTC4002-8.4 is a high efficiency current mode PWM controller with 500kHz switching frequency.
It drives an external P-channel MOSFET for delivering charge currents as high as 4A with efficiencies up to 90%.
The output voltage is set for the final float voltage of 8.4V with +/-1% accuracy; with charge accuracy of +/-5%.
Futhermore, the device operates from a wide selection of wall adapters ranging from 9 to 22V.
The LTC4002-8.4's fast operating frequency and current mode architecture allow the use of small inductors and capacitors when compared with hysteretic topology chargers.
The IC's constant switching frequency minimises noise and filtering needs.
Moreover, this battery charger is stable with all types of output capacitors including low ESR ceramic capacitors.
An internal comparator detects the end-of-charge current and integrated timer sets the total charge time and terminates the charge cycle after 3h.
The LTC4002-8.4 automatically enters sleep mode, dropping the battery drain current to 10uA.
The LTC4002-8.4 is guaranteed for operation from -40 to +85C.
Pricing starts at $1.90 each in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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