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REF3230AIDBVT Datasheet(PDF) 8 Page - Texas Instruments |
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REF3230AIDBVT Datasheet(HTML) 8 Page - Texas Instruments |
8 / 14 page REF3212,REF3220 REF3225,REF3230 REF3233,REF3240 SBVS058 −JUNE 2005 www.ti.com 8 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, ILOAD = 0mA, VIN = +5V power supply, REF3225 is used for typical characteristics, unless otherwise noted. LONG−TERM STABILITY (32 Units) 200 150 100 50 0 −50 −100 −150 −200 0400 200 600 800 1000 1200 Time (Hours) THEORY OF OPERATION The REF32xx is a family of CMOS, precision bandgap voltage references. Figure 1 shows the basic bandgap topology. Transistors Q1 and Q2 are biased so that the current density of Q1 is greater than that of Q2. The difference of the two 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. V BANDGAP Vbe 1 − + Vbe 2 − + R 1 Q 2 N Q 1 I Figure 1. Simplified Schematic of Bandgap Reference APPLICATION INFORMATION The REF32xx does not require a load capacitor and is stable with any capacitive load. Figure 2 shows typical connections required for operation of the REF32xx. A supply bypass capacitor of 0.47 µF is recommended. 1 2 3 6 5 4 +2.5V 0.47 µF +5V Figure 2. 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 voltage in an unloaded condition. For loaded conditions, a typical dropout voltage versus load is shown in the Typical Characteristic curves. |
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