TL431AM (chips) FEATURES Top View PIN CONNECTIONS • Programmable Output Voltage to 40V • Low Dynamic Output Impedance 0.2Ω • Sink Current Capability of 0.1 mA to 100 mA • Equivalent Full-Range Temperature Coefficient o of 50 ppm/ C • Temperature Compensated for Operation over Full Rated Operating Temperature Range • Low Output Noise Voltage • Fast Turn on Respons • TO-92, SOP- 8, SOT-89 or SOT-23 packages SOT-23 SOT-89 SOP-8 TO-92 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 40 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. o o The TL431A is characterized for operation from -0 C to +85 C. SYMBOL FUNCTIONAL BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified) Characteristic Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range o Symbol Value Unit VKA 40 V IK -100 ~ 150 mA IREF -0.05 ~ +10 mA 0.7 0.2 W W Power Dissipation at 25 C: o TO – 92 Package (RqJA = 178 C/W) o SOT – 23 Package (RqJA = 625 C/W) PD Junction Temperature Range TJ 0 ~ 150 o C Operating Temperature Range Tg 0 ~ 70 o C -65 ~ +150 o C Storage Temperature Range Tstg 1 TL431AM (chips) RECOMMENDED OPERATING CONDITIONS Characteristic Symbol Test Condition Min Typ Max Unit Cathode Voltage VKA VREF 40 V Cathode Current IK 0.5 100 mA ELECTRICAL CHARACTERISTICS o (Ta = 25 C, VKA = VREF, IK = 10mA unless otherwise specified) Characteristic Symbol Test Condition Min Typ Max Unit VREF VKA = VREF, IK = 10mA 2.475 2.495 2.505 V Deviation of Reference Input Voltage Over Full Temperature Range VREF(dev) Tmin ≤ Ta ≤ Tmax 3 17 mV Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage ∆V REF ∆V K A ∆VKA = 10V-VREF -1.4 -2.7 ∆VKA = 36V- 10V -1.0 -2.0 IREF R1 = 10KΩ, R2 = ∞ 1.8 4 µA IREF(dev) R1 = 10KΩ, R2 = ∞ 0.4 1.2 µA 0.25 0.5 mA Reference Input Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range mV/V Minimum Cathode Current for Regulation IK(min) Off-State Cathode Current IK(off) VKA = 40 V, VREF = 0 0.26 0.9 µA Dynamic Impedance ZKA IK = 1mA to 100 mA , f ≤ 1.0KHz 0.22 0.5 Ω TEST CIRCUITS Fig.1. Test Circuit for VKA = VREF Fig.2. Test Circuit for VKA ≥ VREF Fig.3. Test Circuit for Ioff INPUT V KA I K(OFF) TL431 BT432 TL431 TL431 VKA ≥ VRE 2 TL431AM (chips) PAD LAYOUT Y 0,0 Ch i p si ze: 0, 81x 0, 76 Pad si ze : 94 x 94 Un i t : µm 2 1 X 3 PAD LOCATION Unit: µm Pad No. Pad Name Description X Y 1 R Reference -314 -299 2 A Anode -75 -275 3 K Cathode 231 -299 PHYSICAL CHARACTERISTIC Wafer dia * Wafer thickness Scribe width Passivation Backside metallization Min. lot yield Min. wafer yield 100 mm (4") 280 … 420 ±20 µm 90 µm PSG Without metallization 75% 60% * The wafer thickness small be specified in a PO or Contract 3