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Battery charger delivers up to 1A to a single-cell Li-ion battery

Posted: 18 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? battery charger? ltc4063?

Linear Technology Corp. announced a small standalone single-cell Li-ion linear battery charger that also provides a regulated output voltage for system supply.

According to the company, the integrated low dropout (LDO) linear regulator can deliver up to 100mA and is adjustable from 1.2V to 4.2V. The LDO is powered from the battery and regulates the output voltage without interruption when the input supply (wall adapter or USB) is removed.

The LTC4063 battery charger operates without the need for a microcontroller and can deliver up to 1A to a single-cell Li-ion battery from an input voltage range of 4.3V to 8V. In addition, the device's SmartStart feature prolongs battery life by minimizing the number of unnecessary charge cycles. To optimize thermal performance, the LTC4063 is housed in a low thermal resistance 3-by-3mm DFN package and has a patented thermal regulation circuit for protection against overheating, the company said.

The LTC4063 has a preset charge voltage of 4.2V with 0.5 percent accuracy. It requires no external MOSFET, blocking diode or sense resistor. Charge current is adjustable with a resistor. With the LTC4063, the user has three choices of termination: program the timer, program the current, or rely on an external means such as a DSP or microcontroller. An output signal pin indicates the charge status.

Designed for use in PDAs, portable MP3 players, digital cameras and portable test/medical equipment, the new product is offered in a 10-lead 3-by-3mm DFN package and is rated for operation between the -40C to 85C temperature range. In 1,000-piece quantity, price starts at $2.10.

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