Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC4061-4.4
Edited by the Electronicstalk Editorial Team on 26 April 2005
Charger cuts unnecessary recharge cycles
The LTC4061-4.4 is a compact stand-alone linear single-cell Li-ion battery charger with features that improve charging safety, simplify charge termination and prolong battery life.
Linear Technology has introduced the LTC4061-4.4, a compact stand-alone linear single-cell 4.375V (4.4V maximum) Li-ion battery charger with advanced features that improve charging safety, simplify charge termination and status reporting, and prolong battery life For safety, the LTC4061-4.4 is equipped with a thermistor interface for temperature qualified charging, an adjustable timer as a backup charge termination, and precision float voltage to prevent cell overcharging
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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To eliminate the risk of overheating while charging at maximum rate, a patented thermal regulation circuit keeps the LTC4061-4.4's junction temperature at a safe level.
The device's I/O pins report the state-of-charge during trickle, normal and end-of-charge modes and indicate the presence of an AC adapter or faulty battery.
The LTC4061-4.4 prolongs battery life by eliminating unnecessary recharge cycles with its SmartStart feature.
The IC offers four methods for charge termination: user adjustable current and time, external digital control or automatic C/10.
The LTC4061-4.4 is housed in a compact 3 x 3mm DFN package and is ideal for charging a battery from a wall adapter or USB in MP3 players, digital cameras, PDAs and cellphones.
The LTC4061-4.4 can charge new 4.375V float voltage Li-ion batteries with +/-0.4% accuracy.
It requires no external sense resistor, MOSFET or blocking diode, greatly simplifying design.
In addition, the LTC4061-4.4 includes a soft-start circuit to minimise the inrush current at the start of a charge cycle.
For USB powered charging, the logic pin from a USB controller can select the charge current, eliminating dependence on external discrete components.
After a battery is fully charged, the LTC4061-4.4 enters a standby mode.
Because frequent recharge cycles reduce battery capacity and shorten battery life, the SmartStart feature starts recharging the battery only if the battery voltage drops below 4.275V.
This feature reduces unnecessary charge cycles, prolonging battery life.
At any point in the charge cycle, the LTC4061-4.4 can be shut down, limiting battery drain current to less than 2uA.
The LTC4061EDD-4.4 is offered in a 10-lead 3 x 3mm DFN package.
1000-piece pricing starts at $2.05 each. Request a free brochure from Linear Technology Corp ...
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