TAIWAN SEMICONDUCTOR TS431-ZAdjustable Precision Shunt Regulator TS431-Z Pin Definition General Description TS431 integrated circuits are three-terminal programmable shunt regulator diodes. These monolithic IC voltage references operate as a low temperature coefficient zener which is programmable from VREF to 36 volts with two external resistors. These devices exhibit a wide operating current range to 250mA with a typical dynamic impedance of 0.2W. The characteristics of these references make them excellent replacements for zener diodes in many applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.495V reference makes it convenient to obtain a stable reference from 5.0V logic supplies, and since The TS431 operates as a shunt regulator, it can be used as either a positive or negative stage reference. Ordering Information Note: “G” denotes for Halogen- and Antimony-free as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds Features • Programmable Output Voltage up to 36V • TS431A - Vref 2.495V ±1 % tolerance • TS431B - VREF 2.495V ±0.5% tolerance • Fast Turn-On Response • Sink Current Capability: 200mA • Low Dynamic Output Impedance: 0.2Q (Typ) • Min. Operating Cathode Current: 0.2mA (Typ) • Halogen Free Absolute Maximum Ratings (Ta = 25oC unless otherwise noted) 2 Note: RejA is measured with the PCB copper area of approximately 1 in (Multi-Layer)

TAIWAN SEMICONDUCTOR TS431-ZAdjustable Precision Shunt Regulator (S^ROHS Pb^oc COMPLIANT Electrical Characteristics (Ta=25°C, unless otherwise specified) * The deviation parameters AVREF and AIREF are defined as difference between the maximum value and minimum value obtained over the full operating ambient temperature range that applied. Where: T2-T1 = full temperature change. aVREF can be positive or negative depending on whether the slope is positive or negative. Example: Maximum Vref=2.496V at 30°C, minimum Vref =2.492V at 0°C, Vref =2.495V at 25°C, AT=70°C aVREF | = [4mV / 2495mV] * 106 /...

TS431-Z Adjustable Precision Shunt Regulator Test Circuits Figure 3: Off-State Current Additional Information – Stability When The TS431A/431B is used as a shunt regulator, there are two options for selection of CL, are recommended for optional stability: A) No load capacitance across the device, decouple at the load. Large capacitance across the device, optional decoupling at the load. The reason for this is that TS431A/431B exhibits instability with capacitances in the range of 10nF to 1uF (approx.) at light cathode current up to 3mA (typ). The device is less stable the lower the cathode voltage...

TS431-Z Adjustable Precision Shunt Regulator Applications Examples (Continue) Figure 4: Voltage Monitor Figure 5: Output Control for Three Terminal Fixed Regulator Figure 6: Shunt Regulator Figure 7: High Current Shunt Regulator Figure 8: Series Pass Regulator Figure 9: Constant Current Source

TS431-ZAdjustable Precision Shunt Regulator Applications Examples (Continue) Figure 12: Single-Supply Comparator with Temperature-Compensated Threshold

TS431-Z Adjustable Precision Shunt Regulator Typical Performance Characteristics Figure 15: Small-Signal Voltage Gain and Phase Shirt vs. Frequency Figure 16: Reference Impedance vs. Frequency

TS431-Z Adjustable Precision Shunt Regulator Typical Performance Characteristics (Continue) Figure 17: Stability Boundary Condition Figure 18: Pulse Response

TS431-Z Adjustable Precision Shunt Regulator Electrical Characteristics Figure 19: Reference Voltage vs. Temperature Figure 20: IREF vs. Temperature

TAIWAN SEMICONDUCTOR (S^ROHS Pb^oc COMPLIANT TS431-Z Adjustable Precision Shunt Regulator SOT-23 Mechanical Drawing Unit: Millimeters Rx = Device Code R1 = TS431A (±1%) RA = TS431AR (±1%) R2 = TS431B (±0.5%) Y = Year Code 2 = 2012, 3 = 2012, 4 = 2014 W = Week Code 01 ~ 26 (A~Z) 27 ~ 52 (a ~ z) X = Internal ID Code

TS431-Z Adjustable Precision Shunt Regulator Notice Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, to any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or...