DESCRIPTION
The TL431/TL431A/TL431B series precision adjustable three terminal shunt voltage regulators are pin-to-pin compatible with the industry standard TL431. The output voltage of this reference is programmable by using two external resistors from 2.5V to 36V. These devices offer low output impedance for improved load regulation. The typical output impedance of these devices is 200mΩ. These devices find application in the feedback path of switching power supplies, OVP crowbar circuits, reference for A/D, D/A, and as zener diodes with improved turn-on characteristics.

KEY FEATURES
□ INITIAL VOLTAGE REFERENCE ACCURACY OF
   0.4% (TL431B)
□ SINK CURRENT CAPABILITY 1mA to 100mA
□ TYPICAL OUTPUT DYNAMIC IMPEDANCE
   LESS THAN 200mΩ;
   TYPICAL OUTPUT IMPEDANCE OF THE
   TL431B LESS THAN 100mΩ
□ ADJUSTABLE OUTPUT VOLTAGE FROM 2.5V
   TO 36V
□ AVAILABLE IN SURFACE-MOUNT PACKAGES
□ LOW OUTPUT NOISE
□ TYPICAL EQUIVALENT FULL RANGE
   TEMPERATURE COEFFICIENT OF 30ppm/°C
□ DIRECT PIN-TO-PIN REPLACEMENT FOR
   INDUSTRY STANDARD TL431 AND TL1431