CORPORATION , Precision Adjustable Shunt Reference FEATURES @ Trimmed 1% Bandgap Reference Nominal Temperature Range Extended to 105C Temperature-Compensated: 30ppm/C @ Internal Amplifier with 150mA Capability @ Low Output Noise @ Low Frequency Dynamic Output Impedance Industrial Temperature Range -40C to +105C TL4311 DESCRIPTION The TL431I is an adjustable shunt regulator designed to act as an open-loop error amplifier with a 2.5V temperature compensated reference. Its highly accurate 1% bandgap reference is perfect for applications requiring stability and accuracy over temperature and life. Sharp turn-on characteristics and a low temperature coefficient make the TL431I an excellent replacement for many zener diode applications, programmable to any value greater than 2.5V and up to 36V by using two external resistors. As a combination error amplifier and reference, it can be used to manage control loops such as switching power supplies. ORDERING INFORMATION 1G-33 Part Package Temperature Range TL431ILP TO-92 -40C to 105C TL4311D 8-Pin Plastc SOIC -40C to 105C TL4311S SOT-89 -40C to 105C PIN CONFIGURATION (Top View) TO-92 (LP) SOIC (D) SOT-89 (S) CATHODE [14 | [8 ] REFERENCE CATHODE CATHODE ANODE [2 | | 7 | ANODE ANODE ANODE [3] re] ANODE ANODE REFERENCE nic [4 | 5 | wc REFERENCE 1G-34 1G-35 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025TL4311 ABSOLUTE MAXIMUM RATINGS CORPORATION a SYMBOL PARAMETER RATING UNITS Vka Cathode-Anode Reverse Breakdown 37 Vv lAK Anode-Cathode Forward Current 1 A IKA Operating Cathode Current 250 mA REF Reference Input Current 10 mA Pp Continuous Power at 25C TO-92 775 mw 8L SOIC 750 mw SOT-89 1000 mw Ty Junction Temperature 150 c TsTG Storage Temperature -65 to 150 C TL Lead Temperature, Soldering 10 Seconds 300 C Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. RECOMMENDED CONDITIONS TYPICAL THERMAL RESISTANCE SYMBOL PARAMETER RATING UNIT PACKAGE OA Buc TYPICAL DERATING VKA Cathode Voltage Vrer to 20 Vv TO-92 160C/W 80C/W 6.3mW/C Ik Cathode Current 10 mA SOIC 175C/W 45C/W 5.7mWC SOT-89 110C/W 8C/AW 9.1mW/C FUNCTIONAL BLOCK DIAGRAM CATHODE (k) KH REFERENCE (R) + L * 2.5V ANODE (A) 1G-36 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025CORPORATION a ELECTRICAL CHARACTERISTICS Electrical Characteristics are guaranteed over full junction temperature range (-40C to 105C). Ambient temperature must be derated based on power dissipation and package thermal characteristics. The conditions are: Vka = Vrer and Ix = 10mA unless otherwise stated. TL4311 TEST CIRCUIT 1 TEST CIRCUIT 2 SYMBOL PARAMETER MIN TYP MAX UNIT | TEST CIRCUIT TEST CONDITION 2.470 2.495 | 2520 Vv 1 Ta = 25C VREF Reference Voltage 2.449 2.541 Vv 1 Over Temp. TC AVrer with Temp. 0.07 0.20 mvV/C 1 AVREF Ratio of Change in Vrer to 27 -1.0 Vrer to 10V mv/V 2 AVk Cathode Voltage ~2 -0.4 0.3 10V to 36V IREF Reference Input Current 0.7 4 A 2 AIREF IREF Temp Deviation 0.4 1.2 yA 2 Over Temp. Ik(MIN) Min Ik for Regulation 0.4 1 mA 1 IK(OFF) Off State Leakage 0.04 250 nA 3 VreF = OV, Vea = 36V ZKA Dynamic Output Impedance 0.15 0.5 Q 1 f < 1kHz, Ik = 1 to 150mA *CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC) E & e AVReF (mV) 0 0 Ome eTC in mvVC =____ 4 4 E ATA _ _ AV REF = = / t AT Ss tok AVREF 0 6000 4 05-4 a . V at 25C J 4 eTC in %PC = EE | | - ATA a a T | | | | | | | | | | | | | 0 15 30 45 60 75 90 105 TEMPERATURE ("C) Rear 6 ; Vrer at 25C Lp 0.07 mvc TC in ppm/C = ATa. L_____. 0.003 %/C > 27 ppm/"C 1G-37 TEST CIRCUITS Vin ~VVV# Via Vin ~VVV# Via Vin WA94* Vica= Veer Ik tlk | K(OFF) ee | R | | 1 l REF uu uo uo (Vrer) Re = 16-38 - 1G-39 - 1G-40 TEST CIRCUIT 3 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025TL4311 CORPORATION a TYPICAL PERFORMANCE CURVES LOW CURRENT OPERATING CHARACTERISTICS 900 800 Vka= VREF < TEMPERATURE RANGE: -55 to 125C = 700 5 600 lu 500 3 400 W300 2 200 < 100 oO 0 < = -100 -200 -1.0 0 1.0 20 3.0 Via - CATHODE VOLTAGE (V) ie-41 100 OFF STATE LEAKAGE Vika = 36V Ww Vaer= OV 2 E 10 of ne ee a iD OO I i 0.1 o UN 0.01 -60 -30 0 30 60 90 120 Ta, AMBIENT TEMPERATURE (C) 1-43 REFERENCE 3.0 INPUT CURRENT TR1 = 10kQ R2 = 00 5 25}l=10mA a 2 ws 2.0 2b ra 15 1H pr wis cc ;O 1.0 SO Le i Ww pL. Tt 05 iz bt 0 -60 -30 0 30 60 90 120 Ta, AMBIENT TEMPERATURE (C) 16-45 lx CATHODE CURRENT (mA) (V) VrRer REFERENCE VOLTAGE Ver - CHANGE IN REFERENCE VOLTAGE (mv) HIGH CURRENT OPERATING CHARACTERISTICS 150 Vka= VREF 125 TEMPERATURE RANGE: -55 to 125C 100 75 50 2 -1 0 1 2 3 Via CATHODE VOLTAGE (V) 1G-42 TEMPERATURE COEFFICIENT AS > 5A A FUNCTION OF TRIM VALUE ~ |Vka= VREF 2.53 |= 10mA 2.52 2.51 2.50 249 VREF = 2.503V AT 25C 2.48 2.47 2.46 -60 -30 0 30 60 90 120 T, AMBIENT TEMPERATURE 1G-44 REFERENCE VOLTAGE LINE REGULATION 0 ANSE -10 5 INQ he Sst NSN WN -40 ~ Ik=10mA TEMPERATURE RANGE: -55 to 125C. 0 3 6 9 12 15 18 21 24 27 30 Via CATHODE VOLTAGE (V) 16-46 U1} CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025TL431| calogic TYPICAL PERFORMANCE CURVES (continued) LOW FREQUENCY DYNAMIC NOISE VOLTAGE OUTPUT IMPEDANCE 70 0.150 a Vka=Vrer | | | N 60 lu 0.125 | | Ikqa=1 TO 100mA x= 9 f< 1kHz > 50 <x / a G 0.100 Wu oa O 40 S \ = 0.075 Y 3 30 : y f 50 2 0.050 Hy 9 Vka= VREF S 7 10|Iq=10mA s 0.025 Ta = 25C N 0 0.0 10 100 1k 10k 100k -60 -30 0 30 60 90 120 f FREQUENCY (Hz) 1G-47 Ta FREE AIR TEMPERATURE 1G-48 DYNAMIC OUTPUT IMPEDANCE _ 100TFT25C & Ik=1TO 100mA O =z 10 x a Lu ao = o 1.0 S =z Zz > oO 0.1 $ N 0.01 1k 10k 100k 1M 10M f FREQUENCY (Hz) 16-49 SMALL SIGNAL GAIN vs FREQUENCY WW OUT Oo K 15k | 2302 oe S| Z a [4 ba OZ t__* a2 a < S204 T < Tt GND a = | 4H-01 > < 1k 10k 100k 1M 10M f FREQUENCY (Hz) 16-50 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025TL4311 CORPORATION a TYPICAL PERFORMANCE CURVES (continued) PULSE RESPONSE roy oT = INPUT o 5 | peepeepespeatee stew sine ceaaiea wees oO : . < : : 5 4 : 9 ' : - 34 OUTPUT : _ 1: 2 : 5 2 3 a 1 << =e) I a z -1 01234567 8 9101112 t TIME (us) 1H-02 STABILITY BOUNDARY 100 CONDITIONS A: Via = Vaer J 9O]B Vka=SVAT I= 10mA E : Vxq= 10V AT I= 10mA _ 80 D: Va = 15V AT I= 10mA mH 70 oc x 60 Oo 50 STABILITY Ww REGION 5 40 FE 30 5 > 20 < = 10 Ty = 25C D 0 109 101 102 103 104 105 106 107 C, LOAD CAPACITANCE (pF) 1H-04 INPUT MONITOR i 2200 MAY OUT 1 @ $502 tp = 100kHz I GND = 1H-03 1509 WN * o { c, 10k 1H-05 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025