CYT 431A Adjustable Precision Shunt Regulator Features General Description The CYT431A is a programmable shunt ■ Adjustable output voltage V0 =2.5V to 36V. voltage reference with guaranteed temperature ■ Wide operating current range 120µA to 150mA. stability over the entire temperature range of ■ Low dynamic output impedance 0.2Ω (Typ.). operation. ■ Voltage Reference Tolerance: ±0.4%. The output voltage may be set to any ■ ESD rating is 5.5KV(Per MIL-STD-883D). value between 2.5V and 36V with two external ■ Available in Lead Free Packages. resistors. This device has a typical output Applications impedance of 0.2Ω. Active output circuitry ■ provides a very sharp turn on characteristic, ■ making this device excellent replacement for ■ Zener diodes in many applications. The CYT431A is characterized operation from 0°C to 105°C. TO-92 Package ■ for ■ ■ SOT-23 Package Adjustable Supplies Battery Operated Computers Computer Disk Drives Linear Regulators Instrumentation Switching Power Supplies SOP-8 Package ShenZhen CYT IC Design CO ,Ltd 1 SOT-89 Package CYT 431A Pin Configuration 1. Ref 2. Cathode 3. Anode 1. Cathode 2. Anode 3. Ref SOT-23 TO-92 1. Cathode 2. Anode 3. Anode 1.Ref 4. NC 2.Anode 5. NC 3.Cathode 6. Anode 7. Anode 8. Ref SOT-89 SOP-8 Application Diagram ShenZhen CYT IC Design CO ,Ltd 2 CYT 431A Marking Information Package Marking Production Lead-Free Week Code Package Production Year Code Starting with S,a bar on top of S is for production SOT-23-3 SC59-3L Lead-free package is year 2001,and underlined S is for year 2002.The CYT431A A-Z:1-26 a-z:27-52 next character is marked on top for 2003, and underlined for 2004.The naming pattem continues indicated by a dot on top of the week code. with consecutive characters for later years. SOP-8 CYT431A YYWW WW is the week SOT-89 CYT431A YYWW 26 means the Lead-free package is product indicated by LF after TO-92 CYT/TL431A YYWW of YY is the year of production. 04 means the product is manufactured in year of 2004. production. is YYWW. manufactured in the th 26 week. Absolute Maximum Ratings Symbol Parameter Value Units VKA Cathode to Anode Voltage 36 V I KA Continuous Cathode Current 150 mA I REF Reference Current 10 mA TJ Operating Junction Temperature Range 150 °C TSTG Storage Temperature Range -65 to 150 °C 220 (TO-92) θJA Thermal Resistance 230 (SOT-23) °C/W 150 (SOP-8) 120 (SOT-89) TLEAD Lead Temperature (Soldering) 10 seconds ShenZhen CYT IC Design CO ,Ltd 3 260 °C CYT 431A Electrical Characteristics Parameter Reference Voltage Symbol Test Circuit Test Conditions 0.5% 1% VREF 1 VKA=VREF,IKA=10mA 2% Min Typ Max 2483 2495 2507 2470 2495 2520 2445 2495 2545 Unit mV Deviation of reference voltage over full temperature range VI(DEV) 1 VKA=VREF,IKA=10mA TA=0°C to 105°C -- 4 25 mV Ratio of change in reference voltage to the change in cathode volage △VREF △VKA 2 IKA=10mA, △VKA=10V- VREF -- -1.4 -2.7 MV/V Reference current IREF 2 IKA=10mA, R1=10KΩ, R2=∞, -- 2 4 uA -- 0.4 1.2 uA Deviation of Reference current over full temperature range II(DEV) 2 IKA=10mA, R1=10KΩ, R2=∞, TA=0°C to 105°C Minimum cathode current for regulation IMIN 1 VKA=VREF -- 0.2 1 mA Off-state cathode current IOFF 3 VKA=18V, VREF=0 -- 0.1 1 uA Dynamic impedance ZKA 1 IKA=1mA to 100mA, VKA=VREF, f ≤ 1KHz -- 0.2 0.7 Ω ShenZhen CYT IC Design CO ,Ltd 4 CYT 431A Typical Performance Characteristics ShenZhen CYT IC Design CO ,Ltd 5 CYT 431A Thermal Consideration Power Rating Power Rating Power Rating (TA=25°C) (TA=50°C) (TA=70°C) SOT-23-3 (θJA=230°C/W) 435mW 326mW 239mW TO-92 (θJA=220°C/W) 455mW 341mW 250mW Package 1. Maximum junction temperature is 125°C 2. θJA is measured with packages mounted onboard under still-air condition with 1W power applied. 3. Power rating is calculated using PD = (TJ – TA) /θJA, where TJ denotes junction temperature and TA denotes ambient temperature. Test Circuits Block Diagram Symbol Diagram ShenZhen CYT IC Design CO ,Ltd 6 CYT 431A OUTLINE DRAWING SC59-3L (SOT-23-3L) DIM N A A1 B C D H E e e1 L1 L Q DIMENSIONS INCHES MM MIN MAX MIN MAX 0.035 0.043 0.90 1.10 0.0004 0.005 0.01 0.13 0.012 0.020 0.30 0.50 0.004 0.008 0.09 0.20 0.110 0.122 2.80 3.10 0.098 0.122 2.50 3.10 0.059 0.067 1.50 1.70 0.037REF 0.95REF 0.075REF 1.90REF 0.008 0.022 0.20 0.55 0.014 0.031 0.35 0.80 0°C 10°C 0°C 10°C OUTLINE DRAWING TO-92 DIM A B E F G H J K N DIMENSIONS INCHES MM MIN MAX MIN MAX 0.175 0.205 4.445 5.207 0.170 0.210 4.318 5.334 0.500 0.610 12.70 15.50 0.016 0.021 0.407 0.533 0.045 0.055 1.143 1.397 0.095 0.105 2.413 2.667 0.080 0.105 2.032 2.667 0.125 0.165 3.175 4.191 ShenZhen CYT IC Design CO ,Ltd 7 CYT 431A OUTLINE DRAWING SOP-8 DIM N A A1 B B1 C D H E DIMENSIONS INCHES MM MIN MAX MIN MAX 0.0532 0.0688 0.35 1.75 0.0040 0.0098 0.10 0.25 0.0130 0.0200 0.33 0.51 0.050BSC 1.27BSC 0.0075 0.0098 0.19 0.25 0.1890 0.1968 4.80 5.00 0.2284 0.2440 5.80 6.20 0.1497 0.1574 3.80 4.00 OUTLINE DRAWING SOT-89 DIM A B C D E F G H I J K L M N DIMENSIONS INCHES MM MIN MAX MIN MAX 0.173 0.181 4.400 4.600 0.159 0.167 4.050 4.250 0.067 0.075 1.700 1.900 0.051 0.059 1.300 1.500 0.094 0.102 2.400 2.600 0.035 0.047 0.890 1.200 0.118REF 3.00REF 0.059REF 1.50REF 0.016 0.020 0.400 0.520 0.055 0.063 1.400 1.600 0.014 0.016 0.350 0.410 10°TYP 10°TYP 0.028REF 0.70REF ShenZhen CYT IC Design CO ,Ltd 8