Synchronous step-down regulator delivers 4 A with tracking
2 June 2004
Power Electronics / Power Management
Linear Technology's LTC3416 is a 95% efficient synchronous buck regulator, which uses a constant frequency, current mode architecture. It also offers voltage tracking for easy supply sequencing. The device can deliver up to 4 A of continuous output current at voltages as low as 0,8 V from a thermally enhanced TSSOP-20 package. It operates from 2,25 V to 5,5 V, making it ideal for both single cell Li-Ion, or NiMH applications, as well as more general purpose fixed rail systems. Switching frequency is programmable from 300 kHz to 4 MHz via a single resistor, ensuring optimal efficiency and allowing the use of very small low cost capacitors and inductors with less than 1,5 mm profile. Constant frequency operation also keeps switching noise low.
The LTC3416 uses internal switches with an RDS(ON) of 0,067 Ω to deliver 95% efficiencies. Low dropout 100% duty cycle operation allows output voltages up to VIN. The LTC3416 operates in forced continuous mode and provides tracking of another power supply rail, yet minimises no load quiescent current to only 300 µA, and less than 1 µA in shutdown.
Fault protection is provided by an overcurrent comparator and adjustable loop compensation allows the transient response to be optimised over a wide range of loads and output capacitance.
For more information contact Memec SA, 011 897 8600.
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