RS431 Adjustable Precision Shunt Regulator DESCRIPTION The RS431 series are three‐terminal adjustable regulators with guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between VREF (approximately 2.5V) and 36V with two external resistors. These devices have a typical dynamic output impedance of 0.2Ω. Active output circuitry provides a very sharp turn‐on characteristic, making these devices excellent replacement for zener diodes in many applications. FEATURES • Programmable Precise Output Voltage from 2.5V to 36V • High Stability under Capacitive Load • Low Temperature Deviation: 4.5mV Typical • Low Dynamic Output Resistance: 0.2Ω Typical • Sink Current Capacity from 1mA to 100mA • Low Output Noise • Wide Operating Range of -40 to 125℃ • Low Equivalent Full-range Temperature Coefficient with 20PPM/℃ Typical BLOCK DIAGRAM Functional Block Diagram Symbol Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan RS431 APPLICATION CIRCUIT Figure 1. VK=VREF Note: VK=VREF(1+R1/R2)+IREF×R1 Figure 2. VK>VREF Figure 3. Off-State Current V1.0 2 December 2012 RS431 ORDER INFORMATION Device RS431 X YY Z Device Code X is Reference voltage precision designator: A: 2.5V±0.4% B: 2.5V±0.8% YY is package designator: A: TO-92 (Straight lead option) AT: TO-92 (Formed lead option) N: SOT-23 Z is Lead Free designator: P: Commercial Standard, Lead (Pb) Free and Phosphorous (P) Free Package G: Green (Halogen Free with Commercial Standard) PIN ASSIGNMENTS SOT-23 TO-92 TO-92 (STRAIGHT LEAD OPTION) (FORMED LEAD OPTION) PIN DESCRIPTION Package SOT-23 TO-92 V1.0 Pin No. 1 2 3 1 2 3 Description Reference Cathode Anode Reference Anode Cathode 3 December 2012 RS431 ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified) Parameter Symbol Ratings Cathode voltage VKA 40 Cathode current range (Continuous) IK -100 ~ +150 Reference input current range IREF 0.05 ~ +10 SOT-23 370 Power dissipation PD TO-92 770 Operating temperature range (Max.) TOPR -40 ~ +125 Storage temperature range TSTG -40 ~ +150 Unit V mA mA mW ℃ ℃ OPERATING CONDITIONS Parameter Cathode voltage Cathode current range (Continuous) Operating ambient temperature range Symbol VKA IK TOPR Min. VREF 1 -40 Max. 36 100 125 Unit V mA ℃ ELECTRICAL CHARACTERISTICS (TA=25℃, unless otherwise specified) Characteristics 2.5V±0.4% Reference input voltage (Figure 1) 2.5V±0.8% Deviation of reference input voltage over‐temperature (Figure 1) Ratio of change in reference input voltage to the change in cathode voltage (Figure 2) Reference input current (Figure 2) Deviation of reference input current over full temperature range (Figure 2) Minimum cathode current for regulation (Figure 1) Off‐state cathode current (Figure 3) Dynamic output impedance (Figure 1) V1.0 Symbol VREF VREF(dev) ΔVREF/ΔVK IREF IREF(dev) Test Condition Min. 2.49 Typ. 2.50 Max. 2.51 2.48 2.50 2.52 VK=VREF, IK=10mA TMIN≤TA≤TMAX (-40~+125℃) - 4.5 16 IK=10mA, ΔVK=10V~VREF - 1.0 2.7 IK=10mA, ΔVK=36V~10V - 0.5 2.0 IK=10mA, R1=10KΩ, R2=∞ IK=10mA, R1=10KΩ R2=∞, TA=-40~+125℃ - 0.7 4 - 0.4 1.2 μA VK=VREF, IK=10mA Unit V mV mV/V IK(min) VK=VREF - 0.4 1.0 mA IK(off) ZK VK=36V, VREF=0 VK=VREF, f≤1KHz, IK=1~100mA - 0.05 0.15 1.0 0.5 μA Ω 4 December 2012 RS431 TYPICAL PERFORMANCE CHARACTERISTICS Delta Reference Voltage vs. Temperature Off-State Current vs. Temperature Impedance vs. Temperature Reference Voltage vs. Temperature Cathode Current vs. Cathode Voltage Current vs. Cathode Voltage V1.0 5 December 2012 RS431 Reference Current vs. Temperature Reference Voltage vs. Cathode Current Small Signal Voltage Gain vs. Frequency Pulse Response of Input and Output Voltage V1.0 6 December 2012 RS431 Reference Impedance vs. Frequency Stability Boundary Conditions vs. Load Capacitance V1.0 7 December 2012 RS431 PACKAGE INFORMATION 3-PIN, SOT-23 Note: All dimensions are in millimeter. V1.0 8 December 2012 RS431 3-PIN, TO-92 Notes: 1. Refer to JEDEC TO-226 AA. 2. All dimensions are in millimeter. V1.0 9 December 2012 RS431 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.0 10 December 2012