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Dual Input Li-Ion Battery Charger with Synchronous 600mA Buck Converter

MILPITAS, CA - February 1, 2006 - Linear Technology Corporation announces the LTC3550-1, an efficient, compact power management solution for handheld applications containing a dual input Li-Ion battery charger and a high efficiency synchronous buck regulator, all housed in a low-profile 16-lead 3mm x 5mm DFN package. The linear battery charger automatically selects the appropriate power source to efficiently charge single-cell Li-Ion batteries: a wall adapter or a USB port. Standalone operation simplifies design, eliminating the need for an external microprocessor for charge termination. Using a constant-current/constant-voltage algorithm, the charger can deliver up to 950mA of charge current from a wall adapter supply, or up to 500mA of charge current from a USB supply. The final float voltage accuracy is ±0.6% in either case. The LTC3550-1's battery charger is equipped with a patented thermal regulation scheme which maximizes the charging rate without the risk of overheating. To preserve battery energy, it draws

The LTC3550-1's integrated synchronous buck regulator can deliver up to 600mA continuous output current. It uses internal switches with an RDS(ON) of only 0.40 Ohm to deliver efficiencies as high as 93%, maximizing battery run time. In addition, automatic Burst Mode® operation optimizes efficiency at light loads, featuring a quiescent current of only 20uA (

The LTC3550-1 is available from stock in a compact 5mm x 3mm x 0.75mm DFN-16 package. Pricing starts at $2.00 each for 1,000-piece quantities.

 

		Summary of Features: LTC3550-1 •  Charges Single-Cell Li-Ion Batteries from Wall Adapter & USB Inputs •  Automatic Input Power Detection & Selection •  Charge Current Programmable up to 950mA from Wall Adapter Input •  High Efficiency 600mA Synchronous Buck Regulator •  No External MOSFET, Sense Resistor or Blocking Diode Needed •  Thermal Regulation Maximizes Charging Rate without Overheating •  Preset Charge Voltage with ±0.6% Accuracy •  Programmable Charge Current Termination •  1.5MHz Constant Frequency Operation (buck converter) •  18uA Suspend Current in Shutdown •  Independent "Power Present" Status Outputs •  Charge Status Outputs •  Automatic Recharge •  Thermally-Enhanced, Low Profile (0.75mm) 16-Lead 3mm x 5mm DFN package	Dual Input Li-Ion Charger with 600mA Buck Click photo for high-res