TL431A FEATURES Adjustable Precision Shunt Regulator • Programmable Output Voltage to 36V • Low Dynamic Output Impedance 0.2Ω • Sink Current Capability of 0.1 mA to 100 mA • Equivalent Full-Range Temperature Coefficient of 50 ppm/oC • Temperature Compensated for Operation over Full Rated Operating Temperature Range • Low Output Noise Voltage • Fast Turn on Response TO-92 TL431CLP CATHODE ANODE REF SOT-89 TL431CPK REF ANODE CATHODE DESCRIPTION The TL431A is a three-terminal adjustable regulator series with a 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. The TL431A is characterized for operation from -0oC to +70oC. SYMBOL FUNCTIONAL BLOCK DIAGRAM SCHEMATIC DIAGRAM Wing Shing Computer Components Co., (H.K.)Ltd. Homepage: http://www.wingshing.com Tel:(852)2341 9276 Fax:(852)2797 8153 E-mail: [email protected] 1 TL431A Adjustable Precision Shunt Regulator ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified) Characteristic Cathode Voltage Cathode Current Range (Continuous) Symbol Value Unit VKA 37 V IK -100 ~ +150 mA Reference Input Current Range IREF 0.05 ~ +10 mA Operating Temperature Range TA 0 ~ +70 o Storage Temperature Range Tstg -65 ~ +150 o C C RECOMMENDED OPERATING CONDITIONS Characteristic Symbol Test Condition Min Typ Max Unit Cathode Voltage VKA VREF 36 V Cathode Current IK 1.0 100 mA ELECTRICAL CHARACTERISTICS (TA = 25oC, unless otherwise specified) Characteristic Symbol Test Condition Min Typ Max Unit VREF VKA = VREF, IK = 10mA 2.475 2.495 2.515 V Deviation of Reference Input Voltage Over-Temperature (Note 1) VREF(dev) VKA = VREF, IK = 10mA 3 17 mV Ratio of Change in Reference Input Voltage to the Change in ∆V R EF ∆V K A ∆VKA = 10V-VREF -1.4 -2.7 ∆KKA = 36V- 10V -1.0 -2.0 Reference Input Voltage Tmin ≤ TA ≤ Tmax IK = 10mA Cathode Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range mV/V IREF IK = 10mA, R1 = 10KΩ, R2 = ∞ 1,8 4 µA IREF(dev) IK = 10mA, R1 = 10KΩ, R2 = ∞ 0.4 1.2 µA Ta = Full Range Minimum Cathode Current for Regulation IK(min) VKA = VREF 0.5 1.0 mA Off-State Cathode Current IK(off) VKA = 36V, VREF = 0 0.26 1.0 µA ZKA VKA = VREF, IK = 10mA to 100mA 0.22 0.4 Ω Dynamic Impedance (Note2) f ≤ 1.0KHz Note: 1. The deviation parameters VREF(dev) and IREF(dev) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. VREF(dev) = VREF(max) - VREF(min) The equivalent full-range temperature coefficient of the reference input voltage, αVREF is defined as: αVREF ( ppm °C )= ( V R EF(dev) V R EF@ ° C ) × 10 6 ∆ Ta A Where ∆TA is the rated operating free-air temperature range of the device. A A αVREF can be positive or negative depending on whether minimum VREF or maximum VREF respectively, occurs at the lower temperature. 2. The dynamic impedance is defined as: ZK A = ∆ VKA ∆ IK Wing Shing Computer Components Co., (H.K.)Ltd. Homepage: http://www.wingshing.com Tel:(852)2341 9276 Fax:(852)2797 8153 E-mail: [email protected] 2 TL431A Adjustable Precision Shunt Regulator When the device is operated with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: Z' = ∆V ∆I R1 = Z K A (1+ ) R2 TEST CIRCUITS Fig.2. Test Circuit for VKA ≥ VREF Fig.1. Test Circuit for VKA = VREF Fig.3. Test Circuit for Ioff PAD LAYOUT 2 (0,0) B T 431 P A D D IA G R A M C h ip size: 1345 x 990 P ad size : U n it : µm 3 4 Wing Shing Computer Components Co., (H.K.)Ltd. Homepage: http://www.wingshing.com 1 Tel:(852)2341 9276 Fax:(852)2797 8153 E-mail: [email protected] 3 TL431A Adjustable Precision Shunt Regulator PAD LOCATION Pad No. Unit: µm Pad Name Description X Y 1 R Reference 235 400 2 K Cathode -505 343.5 3 K Cathode -497.5 -346 4 A Anode -177.5 -341.5 Physical Characteristics 4» Wafes 460 ± 40 µm Wafes 4» Size 1.35 × 0.99 mm Scribe width 90 µm Wafe’s Backside Ti – Ni – Ag: Ti - 0.1 ± 0.02 µm Ni - 0.5 ± 0.1 µm Ag - 0.6 ± 0.1 µm Passivation PSG Wing Shing Computer Components Co., (H.K.)Ltd. Homepage: http://www.wingshing.com Tel:(852)2341 9276 Fax:(852)2797 8153 E-mail: [email protected] 4