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New battery chargers from Linear Tech maximize charging rate

Posted: 11 May 2005 ?? ?Print Version ?Bookmark and Share

Keywords:ltc4075? ltc4075x? linear technology? linear battery charger?

The LTC4075 and LTC4075X from Linear Technology Corp. are standalone dual-input linear battery chargers that efficiently manage charging single-cell Li-ion batteries from two separate power sources: a wall adapter and USB.

Using a constant-current/constant-voltage algorithm, the chargers can deliver up to 950mA of charge current from a wall adapter supply, or up to 500mA of charge current from a USB supply while automatically sensing the presence of voltage at each input. The final float voltage accuracy is 0.6 percent in either case.

The LTC4075X disables the trickle charge function, benefiting systems requiring more charge current during low battery conditions. Target applications include PDAs, MP3 players, lightweight portable medical and test equipment and large color screen cellphones.

The LTC4075/X is equipped with a patented thermal regulation scheme, which maximizes the charging rate without the risk of overheating. The device is extremely flexible as each of the following is programmable via a single resistor: wall adapter supply charge current, USB supply charge current and charge termination current. As a standalone charger, it also features trickle charge for battery pre-conditioning, undervoltage lockout, automatic recharge, a charge status indicator, and "power present" status outputs to indicate the presence of wall adapter or USB power.

To preserve battery energy, the LTC4075 draws <6?A from the battery terminal in standby and <2?A in shutdown mode.

The LTC4075/X is offered in a low profile (0.75mm) 10-lead 3-by-3mm DFN package. The total solution footprint is less than 25mm? since no external MOSFET, sense resistor or blocking diode are required. These two devices are is rated for operation from -40C to 85C. For 1,000-piece orders, pricing for the LTC4075/XEDD begins at $1.88 each.

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