XT336-2.5

XL236-2.5 SOP8 XL336-2.5 SOP8 XT336-2.5 TO-92 General Description The XL236-2.5 / XL336-2.5 and XT336-2.5 integrated circuits are precision 2.5V shunt regulator diodes. These monolithic IC voltage references operate as a lowtemperature-coefficient 2.5V zener with 0.2Ω dynamic impedance. A third terminal on the XL236-2.5 allows the reference voltage and temperature coefficient to be trimmed easily. The XL236-2.5 series is useful as a precision 2.5V low voltage reference for digital voltmeters, power supplies or op amp circuitry. The 2.5V make it convenient to obtain a stable reference from 5V logic supplies. Further, since the XL2362.5 operates as a shunt regulator, it can be used as either a positive or negative voltage reference. The XT336-2.5 is rated for operation over a 0˚C to +70˚C temperature range. See the connection diagrams for available packages. Features n n n n n n n Low temperature coefficient Wide operating current of 400 µA to 10 mA 0.2Ω dynamic impedance ± 1% initial tolerance available Guaranteed temperature stability Easily trimmed for minimum temperature drift Fast turn-on The XL236-2.5 is rated for operation over −55˚C to +125˚C while the XL336-2.5 is rated over a −25˚C to +85˚C temperature range. Connection Diagrams SO Package TO-92 Plastic Package Bottom View Order Number XT336-2.5 TO-92 See NS Package Number Z03A Typical Applications Top View Order Number XL236-2.5 or XL336-2.5 SOP8 See NS Package Number M08A Wide Input Range Reference 2.5V Reference XL336-2.5 XL236-2.5 XL336-2.5 † Adjust to 2.490V * Any silicon signal diode 2.5V Reference with Minimum Temperature Coefficient 1 XL236-2.5 SOP8/XL336-2.5 SOP8/XT336-2.5 TO-92 Absolute Maximum Ratings (Note 1) XT336 0˚C to +70˚C Soldering Information Reverse Current 15 mA Forward Current 10 mA TO-92 Package (10 sec.) 260˚C −60˚C to +150˚C TO-46 Package (10 sec.) 300˚C Storage Temperature SO Package Operating Temperature Range (Note 2) XL236 −55˚C to +150˚C XL336 −25˚C to +85˚C Vapor Phase (60 sec.) 215˚C Infrared (15 sec.) 220˚C See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” (Appendix D) for other methods of soldering surface mount devices. Electrical Characteristics (Note 3) Parameter Reverse Breakdown Voltage Conditions XL236-2.5/XL336-2.5 Units XT336-2.5 Min Typ Max Min Typ Max 2.440 2.490 2.540 2.390 2.490 2.590 V 2.465 2.490 2.515 2.440 2.490 2.540 V 2.6 6 2.6 10 mV 0.2 0.6 0.2 1 Ω 1.8 6 mV 3.5 9 mV 7.5 18 mV 12 18 mV 3 10 3 12 mV 1 0.4 1.4 Ω TA=25˚C, IR=1 mA XL236-2.5 XL336-2.5 XT336-2.5 Reverse Breakdown Change TA=25˚C, With Current 400 µA≤IR≤10 mA Reverse Dynamic Impedance TA=25˚C, IR=1 mA, f = 100 Hz Temperature Stability VR Adjusted to 2.490VIR=1 (Note 4) mA, Figure 20˚C≤TA≤70˚C (XL336)−25˚C≤TA≤+85˚C XL336,XT336 −25˚C ≤ TA ≤ +85˚C (XL336M) −55˚C≤TA≤+125˚C XL236 Reverse Breakdown Change 400 µA≤IR≤10 mA With Current Reverse Dynamic Impedance IR=1 mA 0.4 Long Term Stability TA=25˚C ± 0.1˚C, IR=1 mA, 20 20 ppm t = 1000 hrs Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its specified operating conditions. Note 2: For elevated temperature operation, Tj max is: Thermal Resistance θja (Junction to Ambient) XL236 150˚C XL336 125˚C XT336 100˚C TO-92 TO-46 SO-8 180˚C/W (0.4" leads) 440˚C/W 165˚C/W 80˚C/W n/a 170˚C/W (0.125" lead) θja (Junction to Case) n/a 2 XL236-2.5 SOP8/XL336-2.5 SOP8/XT336-2.5 TO-92 Typical Performance Characteristics Reverse Voltage Change Zener Noise Voltage Dynamic Impedance Response Time Reverse Characteristics Forward Characteristics Typical Performance Characteristics (Continued) Temperature Drift XL236 FIGURE 1. XL236 With Pot for Adjustment of Breakdown Voltage (Trim Range = ± 120 mV typical) 3 XL236-2.5 SOP8/XL336-2.5 SOP8/XT336-2.5 TO-92 Application Hints The XL236 series voltage references are much easier to use than ordinary zener diodes. Their low impedance and wide operating current range simplify biasing in almost any circuit. Further, either the breakdown voltage or the temperature coefficient can be adjusted to optimize circuit performance. Figure 1 shows an XL236 with a 10k potentiometer for adjusting the reverse breakdown voltage. With the addition of R1 the breakdown voltage can be adjusted without affecting the temperature coefficient of the device. The adjustment range is usually sufficient to adjust for both the initial device tolerance and inaccuracies in buffer circuitry. If minimum temperature coefficient is desired, two diodes can be added in series with the adjustment potentiometer as shown in Figure 2. When the device is adjusted to 2.490V the temperature coefficient is minimized. Almost any silicon signal diode can be used for this purpose such as a 1N914, 1N4148 or a 1N457. For proper temperature compensation the diodes should be in the same thermal environment as the XL236. It is usually sufficient to mount the diodes near the XL236 on the printed circuit board. The absolute resistance of R1 is not critical and any value from 2k to 20k will work. Application Hints XL236 FIGURE 2. Temperature Coefficient Adjustment (Trim Range = ± 70 mV typical) (Continued) Low Cost 2 Amp Switching Regulator† *L1 † 60 turns #16 wire on Arnold Core A-254168-2 Efficiency ≈ 80% Precision Power Regulator with Low Temperature Coefficient 4 XL236-2.5 SOP8/XL336-2.5 SOP8/XT336-2.5 TO-92 5V Crowbar Trimmed 2.5V Reference with Temperature Coefficient Independent of Breakdown Voltage *Does Application Hints not affect temperature coefficient (Continued) Adjustable Shunt Regulator XL336-2.5 Linear Ohmmeter XL336-2.5 XL336-2.5 5 XL236-2.5 SOP8/XL336-2.5 SOP8/XT336-2.5 TO-92 Application Hints (Continued) 2.5V Square Wave Calibrator Op Amp with Output Clamped XL336-2.5 XL236-2.5 5V Buffered Reference Bipolar Output Reference XL236-2.5 Low Noise Buffered Reference XL336-2.5 6 XL236-2.5 SOP8/XL336-2.5 SOP8/XT336-2.5 TO-92 Schematic Diagram 7 XL236-2.5 SOP8/XL336-2.5 SOP8/XT336-2.5 TO-92 78 XL236-2.5 SOP8/XL336-2.5 SOP8/XT336-2.5 TO-92 79 XL236-2.5 SOP8/XL336-2.5 SOP8/XT336-2.5 TO-92 710