Analog Devices employs rectification topology in LT8606 switching regulator

The LT8606 synchronous step-down DC/DC converter from Analog Devices delivers 92 per cent efficiency at 2.0MHz. It operates from 3.0 to 42V inputs, adds the company.

Analog Devices, which acquired Linear Technology in March of this year, offers the LT8606, 350mA, 42V input synchronous step-down switching regulator for noise-sensitive and always-on applications.  It uses a synchronous rectification topology to  deliver 92 per cent efficiency while switching at 2.0MHz, enabling designers to avoid critical noise-sensitive frequency bands, such as AM radio while using a very compact solution footprint, says Analog. Burst Mode operation keeps quiescent current under three micro-A in no-load standby conditions, for always-on systems. The LT8606’s 3.0 to 42V input voltage range makes it suitable for automotive applications which must regulate through cold-crank and stop-start scenarios with minimum input voltage as low as 3.0V and load dump transients in excess of 40V. Its internal 650mA switches deliver up to 350mA of continuous output current. 

The LT8606 maintains a minimum dropout voltage of only 175mV (at 300mA) under all conditions, enabling it to excel in scenarios such as automotive cold-crank. Spread spectrum frequency modulation and special design techniques offer low EMI operation, enabling it to meet CISPR25, Class 5 EMI limits required by many automotive and industrial applications. Furthermore, a minimum on-time of only 45ns enables 2.0MHz constant frequency switching from a 16V input to a 1.5V output.

The LT8606 uses internal top and bottom high efficiency power switches with the necessary boost diode, oscillator, control and logic circuitry integrated into a single die. Low ripple Burst Mode operation maintains high efficiency at low output currents, says Analog Devices, while keeping output ripple below 10mVP-P. Design techniques and a high speed process enable high efficiency over a wide input voltage range. The LT8606’s current mode topology enables fast transient response and excellent loop stability, claims Analog. Other features include internal compensation, a power good flag, output soft-start/tracking and thermal protection.

The LT8606EDC is packaged in a 2.0 x 2.0mm eight-lead DFN package and the LT8606EMSE is offered in a 10-lead, thermally enhanced MSOP (MSOP-10) package. The package and high switching frequency, keeps the external inductor and capacitors small, to maintain a compact, thermally efficient footprint, says Analog Devices.

Industrial temperature versions, the LT8606IDC and LT8606IMSE, are tested and guaranteed to operate from a -40 to +125 degree C operating junction temperature.


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