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42V, 3.5A (IOUT) Synchronous Step-Down Regulator with Operation to 175°C

Linear Technology » LT8610AX

Linear Technology Corporation announces the LT8610AX, a 3.5 A, 42 V 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 3.5 μA in no-load standby conditions. Its 3.7 V to 42 V input voltage range is ideal for high temperature applications such as down-hole drilling equipment with power sources ranging from 5 V to 40 V. 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 LT8610AX offers over 90% efficiency (for 12 VIN to 3.3 VOUT conversions) over a wide load current range of 10 mA to 1 A, 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.

Linear Technology - LT8610AX

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 ideal for high temperature environments. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 10 mVP-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.

Efficiency at 175 °C
Efficiency at 175 °C.

Summary of Features: LT8610AX

  • 100% Tested at 175 °C
  • ±2% Reference Accuracy Over –40 °C to 175 °C Range
  • Wide Input Voltage Range: 3.7 V to 42 V
  • Ultralow Quiescent Current Burst Mode® Operation: 3.5 μA
  • High Efficiency Synchronous Operation
    • 91% Efficiency at 0.5 A, at 175°C, 3.3 VOUT from 12 VIN
    • 92% Efficiency at 0.5 A, at 175°C, 5 VOUT from 12 VIN
  • Adjustable & Synchronizable Frequency: 200 kHz to 2.2 MHz
  • No Thermal Shutdown
  • Internal Compensation
  • Output Soft-Start & Tracking
  • Power Good Flag
  • Small Thermally Enhanced 16-Lead MSOP Package

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