Page No. : 1/7 AX431 Series AX431 Series Pin Assignment 3-Lead Plastic SOT-23 Package Code: N Pin 1: Reference Pin 2: Cathode Pin 3: Anode 3 Adjustable Shunt Regulator 1 Description The AX431 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 2.495 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. 1 2 2 3-Lead Plastic SOT-89 Package Code: M Pin 1: Reference Pin 2: Anode Pin 3: Cathode 3 Features • Programmable output voltage • Temperature coefficient is 50ppm/oC typical • Temperature compensated for operation over full temperature range • Low output noise voltage • Fast turn on response 12 8 • 1 2 3 Ordering Information 4 3 3-Lead Plastic TO-92 Package Code: A Pin 1: Reference Pin 2: Anode Pin 3: Cathode 3-Lead Plastic SO-8 Package Code: S 7 6 Pin 1: Cathode 5 Pin 2/3/6/7: Anode Pin 4/5: NC Pin 8: Reference Package VREF: 2.495±2% VREF: 2.495±1% VREF: 2.495±0.5% SOT-23 AX431AN AX431BN AX431CN SOT-89 AX431AM AX431BM AX431CM TO-92 AX431AA AX431BA AX431CA SO-8 AX431AS AX431BS AX431CS Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified) Characteristics Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range Power Dissipation Symbol Value Unit VKA 36 V IK -100~+150 mA IREF 0.05~+10 mA PD SOT-23 280 SOT-89 770 TO-92 770 SO-8 770 mW Operating Temperature Range Topr 0~+70 o C Storage Temperature Range Tstg -65~+150 o C Operating Conditions Characteristics Cathode Voltage Cathode Current Range (Continuous) AVANTICS - AX431 Series Symbol Min. Max. Unit VKA VREF 36 V IK 1 100 mA Specification No.: 050308-FE0001 Page No. : 2/7 Functional Block Diagram & Symbol Functional Block Diagram Symbol + Reference Cathode Cathode - Reference VREF Anode Anode Test Circuits Fig 1. VK=VREF IN Fig 2. VK>VREF II VK II IN IREF Fig 3. Off-State Current R1 VK IN VK IREF IK IOFF IK VREF R2 VREF Note: VK=VREF(1+R1/R2)+IREFxR1 Electrical Characteristics (TA=25oC unless otherwise specified) Characteristics Reference Input Voltage (Fig1) AX431AN/AM/AA/AS AX431BN/BM/BA/BS AX431CN/CM/CA/CS Symbol VREF Deviation of Reference Input Voltage OverTemperature (Fig1) VREF(dev) Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage (Fig2) ∆VREF / ∆VK 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) AVANTICS - AX431 Series IREF IREF(dev) IK(min) IK(off) ZK Test Conditions VK=VREF, IK=10mA VK=VREF, IK=10mA Tmin≤Ta≤Tmax IK=10mA, ∆VK=10V to VREF IK=10mA, ∆VK=36V to 10V IK=10mA, R1=10kΩ, R2=∞ IK=10mA, R1=10kΩ, R2=∞, Ta=Full Range VK=VREF VK=36V, VREF=0 VK=VREF, f≤1kHz IK=1 to 100mA Min Typ Max Unit 2.445 2.470 2.483 2.495 2.495 2.495 2.545 2.520 2.507 V - 4 17 mV - -1.4 -2.7 mV/V - -1.0 -2.0 mV/V - 2 4 uA - 0.4 1.2 uA - 0.4 0.1 1.0 1.0 mA uA - 0.2 0.5 Ω Specification No.: 050308-FE0001 Page No. : 3/7 Characteristics Curve Cathode Current & Cathode Voltage Change in Reference Input Voltage & Cathode Voltage 150 5 Change in Reference Input Voltage (mV) 125 Cathode Current (mA) 100 75 50 25 0 -25 -50 o VK=VREF, Ta=25 C Test Circuit (Fig1) -75 -100 0 -5 -10 -15 -20 -25 -30 o IK=10mA, Ta=25 C Test Circuits (Fig2) -35 -40 -2 -1 0 1 Cathode Voltage (V) 2 3 0 Reference Input Voltage & Temperature 20 30 Cathode Voltage (V) 40 50 Cathode Current & Cathode Voltage 1000 2.58 2.56 800 2.54 Cathode Current (uA) Reference Input Voltage (V) 10 2.52 2.50 2.48 2.46 2.44 VK=VREF, IK=10mA Test Circuit (Fig1) 2.42 -20 0 20 40 60 80 100 400 200 0 -200 2.40 -40 600 120 o Temperature ( C) o VK=VREF, Ta=25 C Test Circuit (Fig1) -400 -2 -1 0 1 Cathode Voltage (V) 2 3 Small Signal Voltage Amplification & Frequency 60 Voltage Amplification (dB) 50 40 30 Vout 20 10 15K Ik 240 + 10uF 8.2K 0 -10 1000 GND 10000 100000 Frequency (Hz) AVANTICS - AX431 Series 1000000 10000000 Specification No.: 050308-FE0001 Page No. : 4/7 Typical Application Fig 4. Shunt Regulator Fig 5. High Current Shunt Regulator Vcc Vout Vcc Vout R1 R1 R2 R2 Vout=(1+R1/R2)VREF Vout=(1+R1/R2)VREF Fig 6. Output Control of a Three-Terminal Fixed Fig 7. Series Pass Regulator Regulator Vcc IN Vcc AX7805 Vout Vout OUT COMMON R1 R1 R2 R2 Vout=(1+R1/R2)VREF; Vout(min)=VREF+5V Vout=(1+R1/R2)VREF; Vout(min)=VREF+VBE Fig 8. Current Limiter or Current Source Fig 9. Constant Current Sink Vcc Vcc RCL Isink Iout Rs Iout=VREF/RCL AVANTICS - AX431 Series Isink=VREF/RS Specification No.: 050308-FE0001 Page No. : 5/7 SOT-23 Dimension Marking: A L 4 3 1 B S 1 Note: Pb-free product can distinguish by the green label or the extra description on the right side of the label. 2 V Pb Free Mark Pb-Free: " " (Note) Normal: None 3 G Pin Style: 1.Reference 2.Cathode 3.Anode Material: • Lead solder plating: Sn60/Pb40 (Normal), Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free) • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 C D K H DIM A B C D G H J K L S V Min. 2.80 1.20 0.89 0.30 1.70 0.013 0.085 0.32 0.85 2.10 0.25 Max. 3.04 1.60 1.30 0.50 2.30 0.10 0.177 0.67 1.15 2.75 0.65 *: Typical, Unit: mm J 3-Lead SOT-23 Plastic Surface Mounted Package AVANTICS Package Code: N SOT-89 Dimension C Marking: H Date Code Control Code Pb Free Mark B AX4 3 1 D 1 2 F 3 E Pb-Free: " . " (Note) Normal: None Note: Green label is used for pb-free packing J G A I Pin Style: 1.Reference 2.Anode 3.Cathode Material: • Lead solder plating: Sn60/Pb40 (Normal), Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free) • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 DIM A B C D E F G H I Min. 4.40 4.05 1.50 2.40 0.36 *1.50 *3.00 1.40 0.35 Max. 4.60 4.25 1.70 2.60 0.51 1.60 0.41 *: Typical, Unit: mm 3-Lead SOT-89 Plastic Surface Mounted Package AVANTICS Package Code: M AVANTICS - AX431 Series Specification No.: 050308-FE0001 Page No. : 6/7 TO-92 Dimension Marking: α2 A Pb Free Mark Pb-Free: " . " (Note) Normal: None B 1 2 A X 4 3 1 A 3 Control Code Date Code α3 Note: Green label is used for pb-free packing C D Pin Style: 1.Reference 2.Anode 3.Cathode H Material: • Lead solder plating: Sn60/Pb40 (Normal), Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free) • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 G DIM A B C D E F G H I α1 α2 α3 Min. 4.33 4.33 12.70 0.36 3.36 0.36 - Max. 4.83 4.83 0.56 *1.27 3.76 0.56 *2.54 *1.27 *5° *2° *2° *: Typical, Unit: mm α1 I E F 3-Lead TO-92 Plastic Package AVANTICS Package Code: A SO-8 Dimension A Marking: G Pb Free Mark 8 7 B 6 5 C Pin1 Index 2 3 Pb-Free: " . " (Note) A X Normal: None I Pin 1 Mark Date Code H Pin Style: 1.Cathode 2/3/6/7.Anode 4/5.NC 8.Reference K E Part A Part A Control Code Note: Green label is used for pb-free packing 4 J D S 4 3 1 M F L N Material: • Lead solder plating: Sn60/Pb40 (Normal), Sn/3.0Ag/0.5Cu or Pure-Tin (Pb-free) • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 DIM A B C D E F G H I J K L M N O Min. 4.85 3.85 5.80 1.22 0.37 3.74 1.45 4.80 0.05 0.30 0.19 0.37 0.23 0.08 0.00 Max. 5.10 3.95 6.20 1.32 0.47 3.88 1.65 5.10 0.20 0.70 0.25 0.52 0.28 0.13 0.15 *: Typical, Unit: mm O 8-Lead SO-8 Plastic Surface Mounted Package AVANTICS Package Code: S Important Notice: • All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of AVANTIC. • AVANTICS reserves the right to make changes to its products without notice. • AVANTICS semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems. • AVANTICS assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. Head Office: • AVANTICS Microelectronics Corp: No. 255, Cai Lun Rd. Zhangjiang Technology Industrial Park Pudong, Shanghai, China Tel: 86-021-58955599 Fax: 86-021-58558038 AVANTICS - AX431 Series Specification No.: 050308-FE0001 Page No. : 7/7 Soldering Methods for AVANTICS’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 Sn-Pb Eutectic Assembly Pb-Free Assembly <3 C/sec <3oC/sec - Temperature Min (Tsmin) 100oC 150oC - Temperature Max (Tsmax) 150oC 200oC 60~120 sec 60~180 sec <3oC/sec <3oC/sec 183oC 217oC Average ramp-up rate (TL to TP) o Preheat - Time (min to max) (ts) Tsmax to TL - Ramp-up Rate Time maintained above: - Temperature (TL) - Time (tL) 60~150 sec Peak Temperature (TP) Time within 5oC of actual Peak Temperature (tP) Ramp-down Rate Time 25oC to Peak Temperature 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 245 C ±5 C 5sec ±1sec 260oC +0/-5oC 5sec ±1sec 3. Flow (wave) soldering (solder dipping) Products Pb devices. Pb-Free devices. AVANTICS - AX431 Series o o Specification No.: 050308-FE0001