Milpitas, Calif Linear Technology released the LTC3563, a high-efficiency, 2.25-MHz, synchronous buck regulator that can deliver up to 500 mA of continuous output current from a 2- x 2-mm DFN package. Its output voltage is pin-selectable to either 1.28 V or 1.87 V. Using a constant-frequency and current-mode architecture, the LTC3563 operates from an input voltage range of 2.5 to 5.5 V, compatible with single-cell Li-Ion, or multi-cell alkaline/NiCad/NiMH applications. Its 2.25-MHz switching frequency enables the utilization of capacitors and inductors less than 1 mm high.
The LTC3563 uses internal switches with an RDS of only 0.35 Ω (n-channel) and 0.50 Ω (p-channel) to deliver efficiencies as high as 96 %. It also uses low-dropout 100% duty cycle operation to allow output voltages equal to VIN to further extend battery run time. The devices also uses low-ripple burst-mode operation, drawing 26μA of no-load quiescent current and shutdown current is less than 1μA. Other features include 2% output voltage accuracy, internal soft-start and over-temperature protection.
Pricing: Begins at $1.60 each in 1,000-piece quantities
Data Sheet: LTC3563
Linear Technology, 408-432-1900, www.linear.com