Linear Technology announced the LTC3417, a dual output, high efficiency, 4-MHz, synchronous buck regulator that delivers up to 1.4A of continuous output current from one channel, and up to 800mA from the second. Using a constant frequency and current mode architecture, the LTC3417 operates from an input voltage range of 2.25V to 5.5V, making it ideal for single cell Li-Ion, multi-cell Alkaline or NiMH applications.
The LTC3417 generated two independent output voltages as low as 0.6V, enabling it to power low voltage DSPs and microcontrollers. Its switching frequency of up to 4 MHz allows the use of tiny, low cost ceramic capacitors and inductors less than 2 mm in height. The combination of dual outputs, current mode architecture, tiny externals and a 5mm x 3mm DFN (or TSSOP-20E) package make the LTC3417 a very compact solution for a variety of applications.
The LTC3417 uses internal switches with an RDS(ON) of only 0.088 Ohm and 0.160 Ohm to deliver efficiencies as high as 95%. It also uses low dropout 100% duty cycle operation to allow output voltages equal to VIN, further extending battery run-time. With Burst Mode operation enabled, no load quiescent current is only 125uA (both channels), and IN, thus lower RMS derating on the input capacitor.
Other features include a power good output, internal soft-start and short-circuit protection. The LTC3417EDHC is available from stock in a DFN-16 package, and the LTC3417EFE is available in a thermally enhanced TSSOP package.
The LTC3417EDHC starts at $3.35, for the LTC3417EFE $3.55 each, both in 1,000-piece quantities.