Battery Charger includes adjustable timer for charge termination.
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Press Release Summary:
Model LTC4056 linear Li-Ion battery charger controller comes in ThinSOT(TM) package that occupies less than 75 mm². It targets systems that need to charge 4.2 V Li-Ion battery from 4.5-6.5 V input source with charge currents ranging from 200-700 mA. When input voltage source sags, unit continues charging battery by limiting charge current until input power source recovers. LTC4056 eliminates need for input reverse current blocking diode and sense resistor.
Original Press Release:
Standalone Li-Ion Battery Charger in ThinSOT Package Includes Adjustable Timer for Charge Termination
MILPITAS, CA - April 9, 2003 - Linear Technology Corporation introduces the LTC4056, a linear Li-Ion battery charger controller in a ThinSOT(TM) package that provides a microcontroller-free solution, as well as faster charging from a poorly regulated or a sagging input supply such as a wall adapter or USB port. The total solution occupies an area of less than 75mm² and has a height of 1mm allowing it to fit in the tight space requirements of portable handheld devices. Where as competing ICs inhibit charging or pull down on an input power supply when the input voltage source sags, the LTC4056 continues charging the battery by limiting the charge current until the input power source recovers. As a result, the LTC4056's uninterrupted battery charging reduces the charging time. Moreover, the IC includes all the necessary functions for charging, charge termination and protection. End products include MP3 players, digital cameras, PDAs, cell phones, headsets as well as USB-interfaced battery-powered electronics.
The LTC4056 targets systems that need to charge a 4.2V Li-Ion battery from a 4.5V to 6.5V input source with charge currents ranging from 200mA to 700mA. To reduce the solution cost, the LTC4056 eliminates the need for an input reverse current blocking diode and a sense resistor. The user can easily adjust the charge current and charge termination time with an off-the-shelf resistor and capacitor, respectively. Precision 1-cell Li-Ion battery charging is guaranteed with the LTC4056's preset 4.2V ±0.5% accurate float voltage. The LTC4056 also features automatic recharge, charge conditioning, status output signal, and AC adapter detection. The LTC4056 drives a PNP transistor for providing current to the battery.
Pricing starts at $1.35 each in 1,000-piece quantities.
Summary of Features: LTC4056
o Programmable Termination Timer
o No Sense Resistor or Blocking Diode Required
o Suitable for USB-Powered Charging
o Undervoltage Charge Current Limiting
o Present Charge Voltage with ±0.5% Accuracy
o Programmable Charge Current from 200mA to 700mA
o Automatic Recharge
o Small 8-Lead ThinSOT package
o Low 40uA Supply Current in Shutdown
COMPANY BACKGROUND: Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include operational, instrumentation and audio amplifiers; voltage regulators, power management devices, DC-DC converters and voltage references; comparators; monolithic filters; communications interface circuits; one-chip data acquisition sub-systems; pulse-width modulators and sample-and-hold devices; and high frequency devices. Applications for Linear Technology's high performance circuits include wireless and broadband telecommunications infrastructure, cellular telephones, networking products and satellite systems, notebook and desk top computers, computer peripherals, video/multimedia, industrial and medical instrumentation, automotive electronics, factory automation, process control, military and space systems, and high-end consumer products including digital cameras, MP3 players and other electronic products.
For more information, contact:
Doug Dickinson, Media Relations Manager
Linear Technology Corporation
1630 McCarthy Boulevard
Milpitas, CA 95035-7417
ddickinson@linear.com
408-432-1900
Call toll-free 1-800-4-LINEAR (for literature only), or go to the company's web site: www.linear.com
Note: LT and LTC are registered trademarks and ThinSOT is a trademark of Linear Technology Corp.
