Step-down regulator delivers 4 A in less than 3 cm²

13 August 2003 Power Electronics / Power Management

A high efficiency, 4 MHz synchronous buck regulator using a constant frequency, current mode architecture, the LTC3414, is claimed to be able to deliver up to 4 A of continuous output current at voltages as low as 0,8 V from a thermally enhanced TSSOP-20 package.

Manufactured by Linear Technology, it operates from an input voltage of 2,25 to 5,5 V, making it ideal for single cell Li-Ion or NiMH batteries, as well as more general purpose fixed rail systems. The LTC3414's switching maximum frequency of 4 MHz allows the use of small low cost capacitors and inductors with a less than 1,5 mm profile. High frequency operation eliminates switching noise from critical wireless and xDSL frequency ranges, making it suitable for xDSL modems, cellular base stations and automotive applications.

The LTC3414 integrates internal MOSFET switches with an RDS (ON) of only 0,067 Ω to deliver efficiencies up to 95%. It also uses low dropout 100% duty cycle operation to allow output voltages equal to VIN. No-load quiescent current is only 64 µA, and less than 1 µA in shutdown. For optimum efficiency at light loads, the device uses selectable burst mode operation to reduce gate charge losses. If the application is noise sensitive, the sync/mode pin can also be configured to provide forced continuous operation to reduce noise and RF interference.

Additional features include a power good voltage monitor, external synchronisation capability and thermal protection. The LTC3414 is available in a 20-lead TSSOP package.

For more information contact Memec SA, 011 897 8600.

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