Buck converter cuts EMI in high power density use

30th March 2020
Mick Elliott

The Power by Linear LTC3310S monolithic synchronous buck converter from Analog Devices is available at distributor Anglia Components.

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.

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