TL431LIBIDBZR

The TL431LI is a 3-terminal adjustable shunt regulator that meets specified thermal stability across applicable automotive-grade and commercial-grade temperature ranges. The output voltage can be set to any value between Vref (approximately 2.495V) and 36V using two external resistors. These devices feature a typical output impedance of 0.3Ω. The active output circuit provides a very sharp turn-on characteristic, making these devices an excellent replacement for Zener diodes in many applications, including on-board regulation, adjustable power supplies, and switching power supplies. This device is a pin-to-pin replacement for the industry-standard TL431, with optimized Iref and IIdev performance. Lower Iref and IIdev values help designers achieve higher system accuracy and lower leakage current. The TL432LI has identical functionality and electrical characteristics as the TL431LI, but features a different DBZ package pinout. The TL431LI is available in two grades, A and B, with initial tolerances of 1% and 0.5% at 25°C, respectively. Additionally, low output temperature drift ensures excellent stability across the entire temperature range. The TL43xLIxQ devices are rated for an operating temperature range of -40°C to 125°C.

Applications

• Adjustable voltage and current reference
• Secondary-side regulation in flyback SMPS
• Zener diode replacement voltage monitoring
• Precision constant sink/source current
• Comparator with integrated reference

Key features

• Reference voltage tolerance at 25°C: 0.5% (Grade B), 1% (Grade A)
• Minimum typical output voltage: 2.495V
• Adjustable output voltage: Vref to 36V
• Operating range: -40°C to +125°C (Q-grade temperature)
• Maximum temperature drift: 10mV (C-grade temperature), 17mV (I-grade temperature), 27mV (Q-grade temperature)
• Typical output impedance: 0.3Ω
• Sink current capability: Imin = 1mA (max), IKA = 15mA (max)
• Reference input current IREF: 0.4μA (max)
• Reference input current deviation over full temperature range II(dev): 0.3μA (max)