Programmable shunt regulators raise efficiencies of low power systems

May 13, 2011 // By Paul Buckley
Diodes Incorporated has released the company’s ZXRE250 and ZXRE252 programmable shunt regulators. The devices feature a low minimum cathode current for regulation of 40 μA, enabling improved efficiency in a range of applications including power supplies for consumer electronics such as computers, set top boxes and LCD TVs.

With the same electrical specifications as the industry standard TL431 but with a 10x lower cathode current, the three terminal regulators claim to offer excellent temperature stability and output current handling up to 100 mA. The devices’ regulated output can be set to any voltage between 2.5 V and 36 V using a pair of external divider resistors.

The ZXRE250 is provided in a choice of SOT23 and SOT25 packages, while the ZXRE252 offers an alternative pinout in SOT23. The parts offer standard reference voltage tolerance options of 1% and 0.5%, with a wide operating temperature range of -40 to 125°C. The regulators can also be used as direct replacements for Zener diodes in applications requiring an improvement in Zener performance.

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