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Standalone Li-Ion Battery Charger with Dual Synchronous Buck Converter

MILPITAS, CA - March 14, 2006 - Linear Technology Corporation announces the LTC3552-1, an efficient, compact power management solution for handheld applications. The LTC3552-1 includes a standalone Li-Ion battery charger and a high efficiency dual synchronous buck regulator housed in a low-profile 3mm x 5mm DFN package. The linear battery charger can deliver up to 950mA charge current from a wall adapter supply, or up to 500mA charge current from a USB supply. Standalone operation simplifies design, eliminating the need for an external microprocessor for charge termination. The final float voltage accuracy is ±1%. The LTC3552-1'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 LTC3552-1's two integrated synchronous buck regulators deliver up to 800mA continuous output current at 1.8V, and up to 400mA at 1.575V, respectively. The internal switches feature an RDS(ON) range of 0.3 Ohm to 0.35 Ohm to deliver efficiencies as high as 92%, maximizing battery run time. In addition, automatic Burst Mode® operation optimizes efficiency at light loads with quiescent current of only 40uA (

The LTC3552-1 is available from stock in a compact 3mm x 5mm x 0.75mm DFN-16 package. Pricing starts at $2.30 each for 1,000-piece quantities.

 

		Summary of Features: LTC3552-1 •  Complete Linear Charger and Dual DC/DC Regulator •  Charge Current Programmable up to 950mA from Wall Adapter Input •  High Efficiency Dual Synchronous DC/DC Buck Converters •  Buck Converter Outputs: 1.8V @800mA and 1.575V @400mA •  No External MOSFET, Sense Resistor or Blocking Diodes Needed •  Thermal Regulation Maximizes Charging Rate without Overheating •   Charges Directly from a USB Port •  Preset Charge Voltage with ±1% Accuracy •  Standalone Operation: Programmable Charge Current Termination •  2.25MHz Constant Frequency Operation (Buck Converter) •  Charge Status Output •  Automatic Recharge •  Thermally-Enhanced, Low Profile (0.75mm) 16-Lead 3mm x 5mm DFN package	Battery Charger & Dual Synchronous Buck Click photos for high-res images