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LDO regulator withstands 80V input at 140°C

Posted: 19 Feb 2007     Print Version  Bookmark and Share

Keywords:Linear Technology  LT3010  micropower  industrial control applications 

Linear Technology Corp. has announced a higher temperature version of the LT3010, a high voltage micropower, low dropout (LDO) regulator that delivers up to 50mA of continuous output current. The H grade version enables operation up to 140°C, compared to the E grade which operates up to 125&176;C. The LT3010 features an input voltage range of 3V to 80V, delivering output voltages as low as 1.275V. The LT3010-5 provides a fixed 5V output. The 80V input voltage capability makes it suitable for automotive applications, 48V telecom backup supplies and industrial control applications. Low quiescent current of 30µA (operating) and 1µA (in shutdown) make it a good choice for battery-powered "keep alive" systems that require optimum run time.

Output noise is minimised at only 100uVRMS over a 10Hz to 100kHz bandwidth, making the LT3010/-5 suitable for noise sensitive applications. For high voltage applications that require large input-to-output voltage differentials, the LT3010/-5 offers a very compact solution. Its thermally enhanced MSOP-8 package offers thermal resistance equivalent to much larger conventional packages.

The LT3010/-5 is able to operate with very small, low cost, ceramic output capacitors. It is stable with only a 1µF output capacitor while older linear regulators require between 10µF and 100µF to maintain stability. These tiny external capacitors can be used without the necessary addition of series resistance as is common with many other regulators. Internal circuitry includes reverse-battery protection, current limiting, thermal limiting and reverse current protection.

The LT3010/-5 is available from stock in an 8-lead thermally enhanced MSOP package. Pricing starts at Rs.92.91 ($2.05) each for 1,000-piece quantities.

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