Page No. : 1/10 RS431 Adjustable Precision Shunt Regulator General 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 2.5 volts) and 36 volts 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 125oC ● Low Equivalent Full‐range Temperature Coefficient with 20PPM/oC Typical Application Circuits Fig 1. VK=VREF II VK IN Fig 2. VK>VREF II IN R1 IREF Fig 3. Off‐State Current VK IK R2 VK IREF IK VREF IN I OFF VREF Note: VK=VREF (1+R1/R2)+IREFxR1 This integrated circuit can be damaged by ESD. Orister Corporation recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. DS‐RS431‐09 September, 2009 www.Orister.com Page No. : 2/10 Pin Assignments SOT‐23 PACKAGE SOT‐23 TO‐92 TO‐92 (STRAIGHT LEAD OPTION) (FORMED LEAD OPTION) PIN 1 2 3 DESCRIPTION REFERENCE CATHODE ANODE PIN 1 2 3 DESCRIPTION REFERENCE ANODE CATHODE PACKAGE TO‐92 Ordering 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) Block Diagram Functional Block Diagram Symbol Cathode Reference Anode DS‐RS431‐09 September, 2009 www.Orister.com Page No. : 3/10 Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified) Characteristics Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range Symbol VKA IK IREF Power Dissipation PD Operating Temperature Range (Max.) Storage Temperature Range TOPR TSTG Value 40 ‐100 ‐ +150 0.05 ‐ +10 Unit V mA mA SOT‐23 TO‐92 ‐‐ ‐‐ 370 770 ‐‐ ‐‐ mW o ‐40 ‐ +125 ‐65 ‐ +150 o C C Operating Conditions Characteristics 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 o C Electrical Characteristics (TA=25°C, unless otherwise specified) Characteristics 2.5V ±0.4% 2.5V ±0.8% Deviation of Reference Input Voltage Over‐ Temperature (Fig1) Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage (Fig2) Reference Input Voltage (Fig1) Reference Input Current (Fig2) Deviation of Reference Input Current Over Full Temperature Range (Fig2) Minimum Cathode Current for Regulation (Fig1) Off‐State Cathode Current (Fig3) Dynamic Output Impedance (Fig1) Symbol VREF Test Conditions VK=VREF, IK=10mA VK=VREF, IK=10mA TMIN≤TA≤TMAX (‐40 ‐ +125oC) I =10mA,, ΔVK=10V to VREF ΔVREF/ΔVK K IK=10mA,, ΔVK=36V to 10V IREF IK=10mA, R1=10KΩ, R2=∞ I =10mA, R1=10KΩ IREF(dev) K R2=∞, Ta=‐40 ‐ +125oC IK(min) VK=VREF IK(off) VK=36V, VREF=0 ZK VK=VREF, f≤1kHz, IK=1 to 100mA VREF(dev) Min 2.49 2.48 Typ 2.50 2.50 Max 2.51 2.52 Unit ‐ 4.5 16 mV ‐ ‐ ‐ 1.0 0.5 0.7 2.7 2.0 4 mV/V mV/V uA ‐ 0.4 1.2 uA ‐ ‐ ‐ 0.4 0.05 0.15 1.0 1.0 0.5 mA uA Ω V DS‐RS431‐09 September, 2009 www.Orister.com Page No. : 4/10 Typical Performance Characteristics DS‐RS431‐09 September, 2009 www.Orister.com Page No. : 5/10 Typical Performance Characteristics (Continued) DS‐RS431‐09 September, 2009 www.Orister.com Page No. : 6/10 Typical Performance Characteristics (Continued) DS‐RS431‐09 September, 2009 www.Orister.com Page No. : 7/10 SOT‐23 Dimension NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C. Body dimensions do not include mold flash or protrusion. Mold flash and protrusion shall not exceed 0.15 per side. DS‐RS431‐09 September, 2009 www.Orister.com Page No. : 8/10 TO‐92 Dimension NOTES: A. All linear dimensions are in inches (millimeters). B. This drawing is subject to change without notice. C. Lead dimensions are not controlled within this area. D. Falls within JEDEC TO‐226 variation AA (TO‐226 replaces TO‐92) E. Shipping Method: Straight lead option available in bulk pack only. Formed lead option available in tape & reel or ammo pack. DS‐RS431‐09 September, 2009 www.Orister.com Page No. : 9/10 Soldering Methods for Orister’s Products 1. Storage environment: Temperature=10oC~35oC Humidity=65%±15% 2. Reflow soldering of surface‐mount devices Figure 1: Temperature profile tP Critical Zone TL to TP TP Ramp-up TL tL Temperature Tsmax Tsmin tS Preheat 25 Ramp-down t 25oC to Peak Time Profile Feature Average ramp‐up rate (TL to TP) Sn‐Pb Eutectic Assembly o <3 C/sec Pb‐Free Assembly <3oC/sec ‐ Temperature Min (Tsmin) 100oC 150oC ‐ Temperature Max (Tsmax) 150oC 200oC 60~120 sec 60~180 sec Preheat ‐ Time (min to max) (ts) Tsmax to TL ‐ Ramp‐up Rate o <3 C/sec <3 C/sec Time maintained above: ‐ Temperature (TL) ‐ Time (tL) o 217oC 183 C 60~150 sec Peak Temperature (TP) Time within 5oC of actual Peak Temperature (tP) Ramp‐down Rate Time 25oC to Peak Temperature o o o 60~150 sec 240 C +0/‐5 C 260oC +0/‐5oC 10~30 sec 20~40 sec <6oC/sec <6oC/sec <6 minutes <8 minutes Peak temperature Dipping time 3. Flow (wave) soldering (solder dipping) Products Pb devices. Pb‐Free devices. o o 245 C ±5 C o o 260 C +0/‐5 C 5sec ±1sec 5sec ±1sec DS‐RS431‐09 September, 2009 www.Orister.com Page No. : 10/10 Important Notice: © Orister Corporation Orister cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an Orister product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. Orister reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in Orister’s terms and conditions of sale, Orister assumes no liability whatsoever, and Orister disclaims any express or implied warranty relating to the sale and/or use of Orister products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent Orister deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. Orister and the Orister logo are trademarks of Orister Corporation. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. DS‐RS431‐09 September, 2009 www.Orister.com