Buck converter cuts EMI in high power density use

The device’s fixed frequency peak current mode architecture is ideal for high step-down ratio applications that demand fast transient response.

It is a very small, low noise, monolithic step-down DC/DC converter capable of providing up to 10A of output current from a 2.25V to 5.5V input supply.

The part employs Silent Switcher 2 architecture with internal hot loop bypass capacitors to achieve both low EMI and high efficiency at switching frequencies as high as 5MHz.

For systems with higher power requirements, multi-phasing parallel converters is readily implemented.

A 2.25V to 5.5V input range supports a wide variety of applications, including most intermediate bus voltages and its integrated low on-resistance MOSFETs deliver continuous load currents as high as 10A with minimal thermal derating.

Output voltages ranging from 0.5V to VIN are ideally suited to point-of-load applications such as high current/low voltage DSP/FPGA/GPU/ASIC designs.

Other key applications include optical networking, telecom/datacom power supplies, industrial, automotive systems, distributed power architectures and general medium to high power density systems.

The device’s low 35ns minimum on-time enables a high step-down ratio power supply at high frequency whilst 100% duty cycle operation delivers low dropout performance. Operating frequency can be synchronised to an external clock. The total reference voltage accuracy is ±1% over the –40°C to 125°C operating junction temperature range and additional features include a power good signal when the output is in regulation, precision enable threshold, output overvoltage protection, thermal shutdown, die temperature monitor, clock synchronisation, mode selection and output short-circuit protection.

The LTC3310S is available in a thermally enhanced 18-lead 3mm × 3mm × 0.94mm LQFN package.

The E- and I- grades are specified from –40°C to 125°C operating junction temperature range.

The device uses Analog Devices Silent Switcher 2 technology which brings new levels of performance for synchronous step-down DC/DC converters, the technology reduces EMC related issues eliminating the need for EMI shielding and simplifying PCB layout.