LM236 LM336,B 2.5V VOLTAGE REFERENCES .. .. . LOW TEMPERATURE COEFFICIENT WIDE OPERATING CURRENT OF 400µA TO 10mA 0.2Ω DYNAMIC IMPEDANCE GUARANTEED TEMPERATURE STABILITY FAST TURN-ON Z TO92 (Plastic Package D SO8 (Plastic Micropackage) DESCRIPTION The LM236 and LM336 are precision 2.5V regulator diodes. These voltage reference monolithic ICs operate like 2.5V zener diodes with a low temperature coefficient and a dynamic impedance of 0.2Ω. A third pin enables adjusting the reference voltage and the temperature coefficient. ORDER CODES Part num- Temperature Range ber –25oC, +85oC LM236 o o 0 C, +70 C LM336,B Package Z D • • • • PIN CONNECTIONS TO92 (Bottom view) ADJ October 1997 V+ V- SO8 (Top view) V+ 8 NC 7 NC 6 ADJ 5 1 NC 2 NC 3 NC 4 V 1/9 LM236 - LM336,B SCHEMATIC DIAGRAM V 50kΩ 24kΩ 24kΩ 6.6kΩ 6pF 3pF 10kΩ 600Ω 30kΩ ADJ 6.6kΩ 2kΩ 1.1kΩ V ABSOLUTE MAXIMUM RATINGS Symbol IR IF Parameter LM236 LM336,B 15 10 15 10 –25 to +85 0 to +70 Current Reverse Forward Unit mA Toper Operating Free-air Temperature Range Tstg Storage Temperature Range –65 to +150 o C o C ELECTRICAL CHARACTERISTICS LM236 -25oC ≤ Tamb ≤ +85oC LM336,B 0oC ≤ Tamb ≤ +70oC (unless otherwise specified) Symbol VR Parameter Typ. Max. Min. Typ. Max. Unit V 2.44 2.49 2.54 2.39 2.44 2.49 2.49 2.59 2.54 mV Reverse Breakdown Voltage Change with Current (400µA ≤ IR ≤ 10mA) o Tamb = +25 C Tmin. ≤ Tamb ≤ Tmax. 2.6 3 6 10 2.6 3 10 12 Reverse Dynamic Impedance (IR = 1mA) Tamb = +25oC Tmin. ≤ Tamb ≤ Tmax. 0.2 0.4 0.6 1 0.2 0.4 1 1.4 KVT Temperature Stability (VR = 2.49V, IR = 1mA) 3.5 9 1.8 6 KVH Long Term Stability (Tamb = +25oC ±0.1oC, IR = 1mA) ZD 2/9 Min. LM336,B Reverse Breakdown Voltage o (Tamb = +25 C, IR = 1mA) LM236, LM336 LM336B ∆VR LM236 Ω mV ppm 20 20 LM236 - LM336,B 3/9 LM236 - LM336,B APPLICATION HINTS The LM236, LM336 voltage references are easier to use than zener diodes. Their low impedance and wide current range facilitate biasing in any circuits. Besides, the breakdown voltage or the temperature coefficient can be adjusted so as to optimize the performance of the circuit. Figure 1 represents a LM336 with a 10kΩ potentiometer to adjust the reverse breakdown voltage can be adjusted without altering the temperature coeffiFigure 1 : The LM336 with Pot for Adjustment of Breakdown Voltage cient of the circuit. The adjustment range is generally sufficient to adjust the initial tolerance of the circuit and the inaccuracy of the amplifier circuit. To obtain a lower temperature coefficient two diodes can be connected in series as indicated in Figure 2. When the circuit is adjusted to 2.49V the temperature coefficient is minimized. For a correct temperature coefficient, the diodes should be at the same ambient temperature as the LM336. The value of R1 is not critical (2-20kΩ). Figure 2 : Temperature Coefficient Adjustment V V RS RS 1N4148 LM336 4/9 R1 10kΩ LM336 R1 10kΩ 1N4148 LM236 - LM336,B TYPICAL APPLICATIONS Figure 3 : 2.5V Reference Figure 4 : Wide Input Range Reference Vi +3.5V to +40V +5V 2.5kΩ LM334 68Ω +2.5V VO = +2.5V LM336 LM336 Figure 5 : Precision Power Regulator with Low Temperature Coefficient Vi LM317 Input VO Output ADJ 1.2kW 1N457 LM336 R1 375W 10kW 1N457 R2 2kW Output adjust Figure 6 : Adjustable Shunt Regulator RS VO +6V to +40V +5V to +40V 20kΩ 560Ω 2N2905 100kΩ 100pF LM308A 20kΩ LM336 5/9 LM236 - LM336,B Figure 7 : Linear Ohmmeter V LM334 35Ω 2.5kΩ 1% 25 kΩ 1% 10kΩ/V 250 kΩ 1% 2.5 MΩ 1% LM336 10kΩ calibrate 100kΩ/V 1kΩ/V 1MΩ/V 100pF 2 1 LM308A 8 6 3 Rx Figure 8 : Bipolar Output Reference +5V 5kΩ 2kΩ +2V LM336 10kΩ 1% 1.25V 10kΩ 1% 5kΩ -5V 6/9 VO LM236 - LM336,B Figure 9 : 5V Buffered Reference Vi +7V to +36V 20kΩ 1% 5.1kΩ 2 7 6 LM308 5V 8 3 4 10kΩ CAL LM336 100pF 20kΩ 1% Figure 10 : Low Noise Buffered Reference +5V 2.2kΩ 2 7 100pF 6 LM308A 20kΩ 2kΩ 3 200kΩ 10kΩ CAL LM336 4 10µF 10µF 7/9 LM236 - LM336,B PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO) Dimensions A a1 a2 a3 b b1 C c1 D E e e3 F L M S 8/9 Min. Millimeters Typ. 0.1 0.65 0.35 0.19 0.25 Max. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 Min. Inches Typ. 0.026 0.014 0.007 0.010 Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.189 0.228 0.197 0.244 0.004 45o (typ.) 4.8 5.8 5.0 6.2 1.27 3.81 3.8 0.4 0.050 0.150 4.0 1.27 0.6 0.150 0.016 8o (max.) 0.157 0.050 0.024 LM236 - LM336,B PACKAGE MECHANICAL DATA 3 PINS - PLASTIC PACKAGE TO92 Dimensions L B O1 C K O2 a Min. 3.2 4.45 4.58 12.7 0.407 0.35 Millimeters Typ. 1.27 3.7 5.00 5.03 0.5 Max. Min. 4.2 5.2 5.33 0.126 0.1752 0.1803 0.5 0.016 0.0138 0.508 Inches Typ. 0.05 0.1457 0.1969 0.198 0.1654 0.2047 0.2098 0.0197 0.02 Max. Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. © 1997 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 9/9