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REF3212 Datasheet(PDF) 8 Page - Texas Instruments |
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REF3212 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 20 page  200 150 100 50 0 -50 -100 -150 -200 0 400 200 600 800 1000 1200 Time(Hours) 1 2 3 6 5 4 +2.5V 0.47 F m +5V V BANDGAP Vbe 1 - + Vbe 2 - + R 1 Q 2 N Q 1 I REF3212, REF3220 REF3225, REF3230 REF3233, REF3240 SBVS058C – JUNE 2005 – REVISED AUGUST 2011 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, ILOAD = 0mA, VIN = +5V power supply, and REF3225 used for typical characteristics, unless otherwise noted. LONG-TERM STABILITY (32 Units) Figure 19. THEORY OF OPERATION GENERAL DESCRIPTION APPLICATION INFORMATION The REF32xx is a family of CMOS, precision The REF32xx does not require a load capacitor and bandgap voltage references. Figure 20 shows the is stable with any capacitive load. Figure 21 shows basic bandgap topology. Transistors Q1 and Q2 are typical connections required for operation of the biased so that the current density of Q1 is greater REF32xx. A supply bypass capacitor of 0.47 μF is than that of Q2. The difference of the two recommended. base-emitter voltages (Vbe1 – Vbe2) has a positive temperature coefficient and is forced across resistor R1. This voltage is amplified and added to the base-emitter voltage of Q2, which has a negative temperature coefficient. The resulting output voltage is virtually independent of temperature. Figure 21. Typical Operating Connections for the REF3225 SUPPLY VOLTAGE The REF32xx family of references features an extremely low dropout voltage. With the exception of the REF3212, which has a minimum supply requirement of 1.8V, these references can be operated with a supply of only 5mV above the output Figure 20. Simplified Schematic of Bandgap voltage in an unloaded condition. For loaded Reference conditions, a typical dropout voltage versus load is shown in the Typical Characteristic curves. 8 Copyright © 2005–2011, Texas Instruments Incorporated |
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