Li-Ion Battery Charger protects circuit against overheating.
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Press Release Summary:
Housed in 2 x 2 mm DFN package, LTC4059A integrated linear battery charger can charge one single-cell Li-Ion battery at 900 mA without overheating. Thermal regulation scheme prevents junction temperature of IC from exceeding 115°C. Complete solution, requiring input capacitor and charge current program resistor, features open drain status pin, charge current monitor output, and 5% charge accuracy. Device operates from input supplies from 3.75-8 V.
Original Press Release:
900mA Li-Ion Battery Charger in 2mm x 2mm Package Protects Circuit Against Overheating
MILPITAS, CA - April 27 2004 - Linear Technology Corporation introduces the LTC4059A, a fully integrated linear battery charger in a tiny package that can charge a single-cell Li-Ion battery at 900mA without overheating itself or the surrounding components. A patented thermal regulation scheme prevents the junction temperature of the IC from exceeding 115°C by reducing charge current during high power or high ambient temperature operation. The IC is housed in a very small 2mm x 2mm DFN package. The complete solution requires only two discrete components (input capacitor and a charge current program resistor) and fits into a 2.5mm x 2.7mm footprint. Applications include digital still cameras, portable point-of-sale and diagnostic equipment, as well as cell phones, PDAs and USB-equipped handheld devices.
The LTC4059A features an open drain status pin to indicate the presence of an input supply such as a wall adapte. Other features include a charge current monitor output for charge termination, a 4.2V 0.6% accurate float voltage, and 5% charge accuracy. The LTC4059A requires no external MOSFET, sense resistor or blocking diode. Charge current is adjustable with a standard off-the-shelf resistor. The device operates from input supplies ranging from 3.75V to 8V including USB ports. During shutdown, the supply current is only 10uA and battery drain current is less than 1uA.
The LTC4059A is rated for operation from -40°C to 85°C. Pricing starts at $1.45 each in 1,000-piece quantities.
Summary of Features: LTC4059A
Programmable Charge Current up to 900mA with ±5% Accuracy
Thermal Regulation Maximizes Charge Rate without Risk of Overheating
Charge Current Monitor Output for Charge Termination
No External MOSFET, Sense Resistor or Blocking Diode Required
Tiny 2mm x 2mm DFN Package
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 frequencydevices. 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.
Note: LT, AND LTC are registered trademarks of Linear Technology Corp.
