ATL431

Product Folder Order Now Technical Documents Tools & Software Support & Community Reference Design ATL431, ATL432 SLVSCV5D – MARCH 2015 – REVISED OCTOBER 2016 ATL431, ATL432 2.5-V Low Iq Adjustable Precision Shunt Regulator 1 Features 1 Adjustable Regulated Output of 2.5 V to 36 V Very-Low Operating Current – IKA(min) = 35 µA (Max) – IREF = 150 nA (Max) Internally Compensated for Stability – Stable With No Capacitive Load Reference Voltage Tolerances at 25°C – 0.5% for B Grade – 1% for A Grade Typical Temperature Drift – 5 mV (–40°C to +85°C); I Version – 6 mV (–40°C to +125°C); Q Version Extended Cathode Current Range 35 µA to 100 mA Low Output Impedance of 0.3 Ω (Max) 2 Applications Secondary Side Regulation in Flyback SMPSs Industrial, Computing, Consumer, and Portables Adjustable Voltage and Current Referencing Power Management Power Isolation Zener Replacement 3 Description The ATL431 and ATL432 are three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and industrial temperature ranges. The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V, with two external resistors. These devices have a typical output impedance of 0.05 Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching p...