Linear Technology Corporation announces the LT8610AX, a 3.5A, 42V input capable synchronous step-down switching regulator, which operates in ambient temperatures up to 175°C. Synchronous rectification delivers efficiency as high as 95% while Burst Mode® operation keeps quiescent current under 3.5µA in no-load standby conditions. Its 3.7V to 42V input voltage range is suited for high-temperature applications such as down-hole drilling equipment with power sources ranging from 5V to 40V. The LT8610AX's electrical parameters are 100% tested at 175 degrees C, offering a VREF accuracy of 2% over the entire -40 to 175 degrees C temperature range.
At ambient temperatures of 175 degrees C, the LT8610AX 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 LT8610AX’s Burst Mode operation offers ultralow quiescent current, well suited for applications requiring extended operating battery life. The LT8610AX’s 16-lead thermally enhanced MSOP package provides a compact, thermally efficient footprint.
The LT8610AX utilizes 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 LT8610AX’s lack of thermal shutdown is well-suited for high-temperature environments.
Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 10mVP-P. The LT8610AX’s current mode topology enables fast transient response and excellent loop stability. 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.
