LM236H-2.5

LM136-2.5/LM236-2.5/LM336-2.5V Reference Diode June 2005 LM136-2.5/LM236-2.5/LM336-2.5V Reference Diode General Description The LM136-2.5/LM236-2.5 and LM336-2.5 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 LM136-2.5 allows the reference voltage and temperature coefficient to be trimmed easily. The LM136-2.5 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 LM1362.5 operates as a shunt regulator, it can be used as either a positive or negative voltage reference. The LM136-2.5 is rated for operation over −55˚C to +125˚C while the LM236-2.5 is rated over a −25˚C to +85˚C temperature range. The LM336-2.5 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 Connection Diagrams TO-92 Plastic Package SO Package 00571508 Bottom View Order Number LM336Z-2.5 or LM336BZ-2.5 See NS Package Number Z03A 00571512 TO-46 Metal Can Package Top View Order Number LM236M-2.5, LM236AM-2.5, LM336M-2.5 or LM336BM-2.5 See NS Package Number M08A 00571520 Bottom View Order Number LM136H-2.5, LM136H-2.5/883, LM236H-2.5, or LM236AH-2.5 See NS Package Number H03H © 2005 National Semiconductor Corporation DS005715 www.national.com LM136-2.5/LM236-2.5/LM336-2.5V Typical Applications 2.5V Reference Wide Input Range Reference 00571509 2.5V Reference with Minimum Temperature Coefficient 00571511 00571510 † Adjust to 2.490V * Any silicon signal diode www.national.com 2 LM136-2.5/LM236-2.5/LM336-2.5V Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Reverse Current Forward Current Storage Temperature Operating Temperature Range (Note 2) LM136 LM236 −55˚C to +150˚C −25˚C to +85˚C 15 mA 10 mA −60˚C to +150˚C LM336 Soldering Information TO-92 Package (10 sec.) TO-46 Package (10 sec.) SO Package Vapor Phase (60 sec.) Infrared (15 sec.) 0˚C to +70˚C 260˚C 300˚C 215˚C 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) LM136A-2.5/LM236A-2.5 Parameter Reverse Breakdown Voltage Conditions TA=25˚C, IR=1 mA LM136, LM236, LM336 LM136A, LM236A, LM336B Reverse Breakdown Change With Current Reverse Dynamic Impedance Temperature Stability (Note 4) TA=25˚C, 400 µA≤IR≤10 mA TA=25˚C, IR=1 mA, f = 100 Hz VR Adjusted to 2.490V IR=1 mA, Figure 2 0˚C≤TA≤70˚C (LM336) −25˚C≤TA≤+85˚C (LM236H, LM236Z) −25˚C ≤ TA ≤ +85˚C (LM236M) −55˚C≤TA≤+125˚C (LM136) Reverse Breakdown Change With Current Reverse Dynamic Impedance Long Term Stability IR=1 mA TA=25˚C ± 0.1˚C, IR=1 mA, 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: LM336B-2.5 LM336-2.5 Min Typ Max Units LM136-2.5/LM236-2.5 Min Typ Max 2.440 2.465 2.490 2.540 2.490 2.515 2.6 6 2.390 2.440 2.490 2.590 2.490 2.540 2.6 10 V V mV 0.2 0.6 0.2 1 Ω 1.8 3.5 7.5 12 3 9 18 18 10 3 6 mV mV mV mV 400 µA≤IR≤10 mA 12 mV 0.4 20 1 0.4 20 1.4 Ω ppm LM136 LM236 LM336 Thermal Resistance θja (Junction to Ambient) θja (Junction to Case) 150˚C 125˚C 100˚C TO-92 180˚C/W (0.4" leads) 170˚C/W (0.125" lead) n/a 80˚C/W n/a TO-46 440˚C/W SO-8 165˚C/W 3 www.national.com LM136-2.5/LM236-2.5/LM336-2.5V Electrical Characteristics (Note 3) (Continued) Note 3: Unless otherwise specified, the LM136-2.5 is specified from −55˚C ≤ TA ≤ +125˚C, the LM236-2.5 from −25˚C ≤ TA ≤ +85˚C and the LM336-2.5 from 0˚C ≤ TA ≤ +70˚C. Note 4: Temperature stability for the LM336 and LM236 family is guaranteed by design. Design limits are guaranteed (but not 100% production tested) over the indicated temperature and supply voltage ranges. These limits are not used to calculate outgoing quality levels. Stability is defined as the maximum change in Vref from 25˚C to TA (min) or TA (max). www.national.com 4 LM136-2.5/LM236-2.5/LM336-2.5V Typical Performance Characteristics Reverse Voltage Change Zener Noise Voltage 00571521 00571522 Dynamic Impedance Response Time 00571523 00571524 Reverse Characteristics Forward Characteristics 00571525 00571526 5 www.national.com LM136-2.5/LM236-2.5/LM336-2.5V Typical Performance Characteristics (Continued) Temperature Drift 00571528 FIGURE 1. LM136 With Pot for Adjustment of Breakdown Voltage (Trim Range = ± 120 mV typical) 00571527 Application Hints The LM136 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 LM136 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 LM136. It is usually sufficient to mount the diodes near the LM136 on the printed circuit board. The absolute resistance of R1 is not critical and any value from 2k to 20k will work. 00571529 FIGURE 2. Temperature Coefficient Adjustment (Trim Range = ± 70 mV typical) www.national.com 6 LM136-2.5/LM236-2.5/LM336-2.5V Application Hints (Continued) Low Cost 2 Amp Switching Regulator† 00571505 *L1 † 60 turns #16 wire on Arnold Core A-254168-2 Efficiency ≈ 80% Precision Power Regulator with Low Temperature Coefficient 00571513 5V Crowbar Trimmed 2.5V Reference with Temperature Coefficient Independent of Breakdown Voltage 00571515 *Does 00571514 not affect temperature coefficient 7 www.national.com LM136-2.5/LM236-2.5/LM336-2.5V Application Hints (Continued) Adjustable Shunt Regulator 00571506 Linear Ohmmeter 00571516 www.national.com 8 LM136-2.5/LM236-2.5/LM336-2.5V Application Hints (Continued) 2.5V Square Wave Calibrator Op Amp with Output Clamped 00571519 5V Buffered Reference 00571517 Bipolar Output Reference 00571530 Low Noise Buffered Reference 00571531 00571518 9 www.national.com LM136-2.5/LM236-2.5/LM336-2.5V Schematic Diagram 00571501 www.national.com 10 LM136-2.5/LM236-2.5/LM336-2.5V Physical Dimensions unless otherwise noted inches (millimeters) Order Number LM136H-2.5, LM136H-2.5/883, LM236H-2.5, LM136AH-2.5, LM136AH-2.5/883 or LM236AH-2.5 NS Package Number H03H Small Outline (SO) Package (M) Order Number LM236M-2.5, LM236AM-2.5, LM336M-2.5 or LM336BM-2.5 NS Package Number M08A 11 www.national.com LM136-2.5/LM236-2.5/LM336-2.5V Reference Diode Physical Dimensions inches (millimeters) unless otherwise noted (Continued) TO-92 Plastic Package (Z) Order Number LM336Z-2.5 or LM336BZ-2.5 NS Package Number Z03A National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. 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