ATL431LI High-Bandwidth, Low IQ Programmable Shunt Regulator

Texas Instruments’ regulator features active output circuitry making it an excellent Zener diode replacement in many applications.

Texas Instruments’ ATL431LI device is a three-terminal adjustable shunt regulator with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between V_REF (approximately 2.5 V) and 36 V, with two external resistors. This regulator has a typical output impedance of 0.3 Ω. Active output circuitry provides an ultra-sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications such as onboard regulation, adjustable power supplies, and switching power supplies. This device is a pin-to-pin alternative to the TL431LI and TL432LI, with a lower minimum operating current to help reduce system power consumption. The ATL432LI and the ATL431LI have the same functionality and electrical specifications, except the ATL432LI has a different pinout for the DBZ package. The ATL431LI is offered in a tiny X2SON (1.00 mm x 1.00 mm) package which makes it ideal for space-constraint applications.

The ATL431LI device is offered in B grade and A grade with initial tolerances of 0.5% and 1% (at +25°C), respectively. The low output drift versus temperature ensures good stability over the entire temperature range. The ATL43xLIxQ devices are characterized for the operating temperature range of -40°C to +125°C.

Features

• Reference voltage tolerance at +25°C:B grade: 0.5%, A grade: 1%
• Output voltage: 2.5 V (minimum typ.), VREF to 36 V (adjustable)
• Operating temperature range: -40°C to +125°C (Q temp)
• Max temperature drift: 17 mV (I temp), 27 mV (Q temp)
• Output impedance: 0.3 Ω (typ.)
• Sink-current capability: Imin: 0.08 mA (max.), IKA: 15 mA (max.)
• Reference input current IREF: 0.4 µA (max.)
• Deviation of reference input current overtemperature, II(dev): 0.3 µA (max.)
• Packages: 1 mm x 1 mm X2SON or SOT23-3

more information: www.ti.com

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