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LM4431M3-2.5 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM4431M3-2.5 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 8 page Functional Block Diagram Applications Information The LM4431 is a micro-power curvature-corrected 2.5V bandgap shunt voltage reference. For space critical applica- tions, the LM4431 is available in the sub-miniature SOT-23 surface-mount package. The LM4431 has been designed for stable operation without the need of an external capacitor connected between the “+” pin and the “−” pin. If, however, a bypass capacitor is used, the LM4431 remains stable. The operating current range is 100 µA to 15 mA. The LM4431’s SOT-23 package has a parasitic Schottky di- ode between pin 2 (−) and pin 3 (Die attach interface con- tact). Therefore, pin 3 of the SOT-23 package must be left floating or connected to pin 2. In a conventional shunt regulator application ( Figure 1),an external series resistor (R S) is connected between the sup- ply voltage and the LM4431. R S determines the current that flows through the load (I L) and the LM4431 (IQ). Since load current and supply voltage may vary, R S should be small enough to supply at least the minimum acceptable I Q to the LM4431 even when the supply voltage is at its minimum and the load current is at its maximum value. When the supply voltage is at its maximum and I L is at its minimum, RS should be large enough so that the current flowing through the LM4431 is less than 15 mA. R S is determined by the supply voltage, (VS), the load and operating current, (I L and IQ), and the LM4431’s reverse breakdown voltage, V R. Typical Applications DS011374-8 DS011374-9 FIGURE 1. Shunt Regulator www.national.com 4 |
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