42V 3.5A synchronous step-down regulator operates to 175°C

42V 3.5A synchronous step-down regulator operates to 175°C

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By Christoph Hammerschmidt

The 3.7V to 42V input voltage range of the LT8610AX is ideal for high temperature applications such as down-hole drilling equipment with power sources ranging from 5V to 40V, while the synchronous rectification delivers efficiency as high as 95% and the Burst Mode operation keeps quiescent current under 3.5µA in no-load standby conditions.  

The LT8610AX’s electrical parameters are 100% tested at 175°C, offering a VREF accuracy of 2% over the entire -40°C to 175°C temperature range. At ambient temperatures of 175°C, the regulator offers over 90% efficiency (for 12VIN to 3.3VOUT conversions) over a wide load current range of 10mA to 1A, ideal for battery powered applications commonly found in down-hole drilling systems. 

The device uses internal top and bottom high efficiency power switches with the necessary boost diode, oscillator, control and logic circuitry integrated into a single die. This eliminates the need for any external Schottky diodes, which can be problematic at high temperatures. The lack of thermal shutdown is ideal for high temperature environments and the low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 10mVP-P. The current mode topology enables fast transient response and excellent loop stability and specialized Cu/Ni/Au bond pad plating ensures long life in high temperature environments. Other features include internal compensation, a power good flag and output soft-start/tracking.

The LT8610AXMSE is packaged in a thermally enhanced MSOP-16 package, priced at $125.00 each in 1,000-piece quantities and available from stock.

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