WT431LT1 PROGRAMMABLE PRECISION REFERENCE P b Lead(Pb)-Free 3 1 Features: * Programmagle output voltage to 36V. * Low dynamic output impedance 0.2Ω. * Sink current capability of 1 to 100mA. * Equivalent full-range temperature coefficient of 50ppm/°C typical for operation over full rated operating temperature range. 2 SOT-23 Description: * The WT431 is a three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between Vref(approximately 2.5) and 36V with two external resistors. It provides very wide applications, including shunt regulator, series regulator, switching regulator, voltage reference and others. SOT-23 Outline Dimensions Unit:mm A B TOP VIEW E G C D H K J WEITRON http://www.weitron.com.tw L M 1/5 Dim A B C D E G H J K L M Min 0.35 1.19 2.10 0.85 0.46 1.70 2.70 0.01 0.89 0.30 0.076 Max 0.51 1.40 3.00 1.05 1.00 2.10 3.10 0.13 1.10 0.61 0.25 03-Nov-06 WT431LT1 BLOCK DIAGRAM CATHODE REF + VREF ANODE PIN ASSIGNMENT WT431R WT431L 3 1 3 2 1 PIN1 = REF PIN2 = Cathode PIN3 = Anode 2 PIN1 = Cathode PIN2 = REF PIN3 = Anode Ordering information Ordering Number Rank Shipping WT431RA 0.5% 3000 Units / Tape & Reel WT431RB 1% 3000 Units / Tape & Reel WT431LA 0.5% 3000 Units / Tape & Reel WT431LB 1% 3000 Units / Tape & Reel WEITRON http://www.weitron.com.tw 2/5 03-Nov-06 WT431LT1 ABSOLUTE MAXIMUM RATINGS(Operating temperature range applies unless otherwise specified) PARAMETER SYMBOL VALUE UNIT Cathode Voltage VKA 36 V Cathode Current Range(Continuous) IKA -100 ~ +150 mA Reference Input Current Range Iref -0.05 ~ +10 mA Operating Junction Temperature Tj 150 °C Operating Ambient Temperature Topr 0~70 °C Storage Temperature Tstg -65 ~ +150 °C RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL Min Typ Max UNIT Cathode Voltage VKA VREF - 36 V Cathode Current IKA 1 - 100 mA ELECTRICAL CHARACTERISTICS(TA=25˚C unless otherwise specified) PARAMETER Reference Input Voltage Deviation of reference Input Voltage Over temperature SYMBOL TEST CONDITIONS Deviation of reference Input Current Over Full temperature range Typ Max UNIT Vref VKA=VREF, IKA=10mA - 2.50 - V ΔVref /ΔT VKA=VREF, IKA=10mA TMIN<=TA<=TMAX - 4.5 17 mV - -1.0 -0.5 -2.7 -2.0 mV/V Ratio of Change in Reference Input ΔVKA=10V~VREF ΔVref /ΔVKA IKA=10mA Voltage to the change in Cathode Voltage ΔVKA=36V~10V Reference Input Current Min Iref IKA=10mA, R1=10kΩ ∞ - 1.5 4 µA ΔIref /ΔT IKA=10mA, R1=10kΩ TA=full temperature ∞ - 0.4 1.2 µA Minimum Cathode current for Regulation IKA(min) VKA=VREF - 0.45 1.0 mA Off-State Cathode current IKA(OFF) VKA=36V, VREF=0 - 0.05 1.0 µA VKA=VREF=0, IKA=1 to 100mA <= - 0.15 0.5 Ω Dynamic Impedance ZKA CLASSIFICATION OF Vref AND & MARKING PARAMETER Rank Range(V) Marking WT431RA 0.5% 2.487~2.512 RA WT431RB 1% 2.475~2.525 RB WT431LA 0.5% 2.487~2.512 LA WT431LB 1% 2.475~2.525 LB WEITRON http://www.weitron.com.tw 3/5 03-Nov-06 WT431LT1 TYPICAL PERFORMANCE CHARACTERISTICS A 1 T 1 C T RE C A RE A A I A C C C C 4 1 1 1 3 1 1 C Fig 1 Cathode Current Vs Cathode Voltage C C T I IN 3 C 1 A T 1 C C C A 1 I R 4 3 I C 3 3 1 4 1 1 3 3 4 1 3C C 3 4 T C R I 4 R 1 T I A 1 C A 1 T I A 1 A 1 C A 4 I A 3 1 1 1 1 1 3 1 D 1 4 1 1 1 1 I WEITRON http://www.weitron.com.tw 3 1 4 1 1 1 A 4/5 03-Nov-06 WT431LT1 WT431 LINEAR INTEGRATED CIRCUIT TE T CIRCUIT A IN UT I IN UT I A A IN UT A I A A R1 IRE WT431 R RE A 7T A C A 8T RE WT431 WT431 RE RE 1 R1 R C IRE R1 A 9T RE C I A LICATI N CIRCUIT IN WT7805 C R1 UT N R1 RE R1 RE RE R R 1 R1 R 1 R WT431 WT431 1 R1 R RE R 11 T WT431 RE C 1 R1 R T R RE 1 R I I RCL R R WT431 I WT431 RE R I 13 C WEITRON http://www.weitron.com.tw 14 C 5/5 RE L RCL C 03-Nov-06