TAIWAN SEMICONDUCTOR TS1431Adjustable Precision Shunt Regulator Pin Definition 1. Cathode 2. Reference 3. Anode General Description TS1431 series 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 of 1.0 to 100mA with a typical dynamic impedance of 0.22W. 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 2.5V reference makes it convenient to obtain a stable reference from 5.0V logic supplies, and since The TS1431 series operates as a shunt regulator, it can be used as either a positive or negative stage reference. Features • Precision Reference Voltage TS1431A - 2.495V±1% TS1431B - 2.495V±0.5% • Equivalent Full Range Temp. Coefficient: 50ppm/ °C • Programmable Output Voltage up to 36V • Fast Turn-On Response • Sink Current Capability of 1 ~100mA • Low Dynamic Output Impedance: 0.2Q • Low Output Noise Application • Voltage Monitor • Delay Timmer • Constant -Current Source/Sink • High-Current Shunt Regulator • Crow Bar • Over-Voltage / Under-Voltage Protection Ordering Information Part No. Note: “G” denote for Green Product Where xx denotes voltage tolerance A: ±1%, B: ±0.5% Block Diagram Absolute Maximum Ratings (Ta = 25oC unless otherwise noted)

TAIWAN SEMICONDUCTOR RoHS TS1431 Adjustable Precision Shunt Regulator Electrical Characteristics Parameter 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. The average temperature coefficient of the reference input voltage, aVREF is defined as: ( <AVref) ' 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 30oC, minimum VREF =2.492V at 0oC, VREF =2.495V...

TS1431 Adjustable Precision Shunt Regulator Test Circuits Figure 3: Off-State Current Additional Information – Stability When The TS1431A/1431B 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. B) Large capacitance across the device, optional decoupling at the load. The reason for this is that TS1431A/1431B exhibits instability with capacitances in the range of 10nF to 1µF (approx.) at light cathode current up to 3mA(typ). The device is less stable the lower the cathode...

TS1431 Adjustable Precision Shunt Regulator Applications Examples (Continue) Figure 6: Shunt Regulator Figure 7: High Current Shunt Regulator Figure 8: Series Pass Regulator Figure 9: Constant Current Source Figure 10: TRIAC Crowbar

TAIWAN SEMICONDUCTOR RoHS TS1431 Adjustable Precision Shunt Regulator COMPLIANCE Applications Examples (Continue) Figure 12: Single-Supply Comparator with Figure 13: Constant Current Sink Temperature-Compensated Threshold

TS1431 Adjustable Precision Shunt Regulator Typical Performance Characteristics Test Circuit for Voltage Amplification Figure 15: Small-Signal Voltage Gain and Phase Shirt vs. Frequency Test Circuit for Reference Impedance Figure 16: Reference Impedance vs. Frequency

TAIWAN SEMICONDUCTOR TS1431 Adjustable Precision Shunt Regulator COMPLIANCE Typical Performance Characteristics (Continue) RoHS The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V+ were adjusted to establish the initial Vka and Ika conditions with Cl=0. Vbatt and Cl then were adjusted to determine the ranges of stability. Figure 17: Stability Boundary Condition Test Circuit for Pulse Response, Ik=1mA Figure 18: Pulse Response Version: E15

TAIWAN SEMICONDUCTOR RoHS COMPLIANCE Electrical Characteristics 2.60 2.57 |— 2.55 TS1431Adjustable Precision Shunt Regulator 2.00 Vka - Cathode Voltage (V) Figure 21: Cathode Current vs. Cathode Voltage Document Number: DS P0000229

TAIWAN SEMICONDUCTOR TS1431 Adjustable Precision Shunt Regulator SOT-23 Mechanical Drawing Unit: Millimeters x = Tolerance Code (A = ±1%, B = ±0.5%) 1 = Device Code Y = Year Code M = Month Code for Halogen Free Product O =Jan P =Feb Q =Mar R =Apr

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