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LM236 LM336,B 2.5V VOLTAGE REFERENCES . . . . . LOW TEMPERATURE COEFFICIENT WIDE OPERATING CURRENT OF 400µA TO 10mA 0.2 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 0.2. A third pin enables adjusting the reference voltage and the temperature coefficient. PIN CONNECTIONS TO92 (Bottom view) ADJ V+ VV+ 8 ORDER CODES Part num- Temperature Range ber LM236 LM336,B ­25oC, +85oC 0 C, +70 C o o Package Z · · D · · SO8 (Top view) NC 7 NC 6 ADJ 5 1 NC 2 NC 3 NC 4 V October 1997 1/9 LM236 - LM336,B SCHEMATIC DIAGRAM V 50k 24k 24k 6.6k 3pF 10k 6pF 600 30k ADJ 6.6k 2k 1.1k V ABSOLUTE MAXIMUM RATINGS Symbol IR IF Toper Tstg Current Reverse Forward Operating Free-air Temperature Range Storage Temperature Range Parameter LM236 15 10 ­25 to +85 ­65 to +150 LM336,B 15 10 0 to +70 o o Unit mA C C ELECTRICAL CHARACTERISTICS LM236 -25oC Tamb +85oC LM336,B 0oC Tamb +70oC (unless otherwise specified) Symbol VR Parameter Reverse Breakdown Voltage o (Tamb = +25 C, IR = 1mA) LM236, LM336 LM336B VR Reverse Breakdown Voltage Change with Current (400µA IR 10mA) o Tamb = +25 C Tmin. Tamb Tmax. Reverse Dynamic Impedance (IR = 1mA) Tamb = +25oC Tmin. Tamb Tmax. Temperature Stability (VR = 2.49V, IR = 1mA) Long Term Stability (Tamb = +25oC ±0.1oC, IR = 1mA) 2.44 2.49 2.54 2.39 2.44 2.49 2.49 2.59 2.54 mV 2.6 3 0.2 0.4 3.5 20 6 10 0.6 1 9 2.6 3 0.2 0.4 1.8 20 10 12 1 1.4 6 LM236 Min. Typ. Max. Min. LM336,B Typ. Max. Unit V ZD KVT KVH mV ppm 2/9 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 10k 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 (2-20k). Figure 2 : Temperature Coefficient Adjustment V RS V RS 1N4148 R1 10k 1N4148 LM336 R1 10k LM336 4/9 LM236 - LM336,B TYPICAL APPLICATIONS Figure 3 : 2.5V Reference Figure 4 : Wide Input Range Referen