Synchronous step-down switching regulator with 42V input and 3.5A output
Burst mode operation maintains the standby current at 3.5µA or less under no-load standby conditions.

Linear Technology Korea (CEO Hong Sa-kwak) announced the release of a synchronous step-down switching regulator (product name: LT8610AX) with a 42V input and 3.5A output.

This product operates at ambient temperatures up to 175°C. Synchronous rectification provides high efficiency of 95%, while Burst Mode® operation maintains a standby current of 3.5µA or less under no-load standby conditions. The product's 3.7V to 42V input voltage range is ideal for high-temperature applications, such as down-hole drilling devices where the power source is in the 5V to 40V range.



The electrical characteristics of the LT8610AX are 100% tested at 175°C and provide 2% VREF accuracy over a temperature range of –40°C to 175°C. At an ambient temperature of 175°C, the LT8610AX provides over 90% efficiency over a wide load current range of 10mA to 1A (for 12VIN to 3.3VOUT conversion) and is suitable for battery-powered applications commonly used in downhole drilling systems.

The burst mode operation of the LT8610AX provides ultra-low standby current, making it highly suitable for applications requiring extended battery life. The LT8610AX's 16-pin thermally enhanced MSOP package offers a compact yet thermally efficient footprint.

The LT8610AX utilizes an integrated high-efficiency upper and lower power switch that integrates essential boost diodes, oscillators, control, and logic circuits onto a single die. This feature eliminates the need for external Schottky diodes, which can cause problems at high temperatures.

The LT8610AX is ideal for high-temperature environments because it lacks a thermal shutdown function. Low-ripple burst mode operation maintains output ripple below 10 mVP-P while preserving high efficiency at low output currents. The LT8610AX's current-mode topology enables fast transient response and excellent loop stability. Specialized Cu/Ni/Au bond pad plating ensures a long lifespan in high-temperature environments. Other features include internal compensation, a power good flag, and output soft-start/tracking.

The LT8610AXMSE is supplied in an enhanced thermal performance MSOP-16 package and is priced at $125 per unit in 1,000-unit quantities. This product is available immediately.