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LM4050AIM3 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM4050AIM3 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 15 page  Functional Block Diagram 10104514 Applications Information The LM4050 is a precision micro-power curvature-corrected bandgap shunt voltage reference. For space critical applica- tions, the LM4050 is available in the sub-miniature SOT-23 surface-mount package. The LM4050 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 LM4050 remains stable. Re- ducing design effort is the availability of several fixed reverse breakdown voltages: 2.048V, 2.500V, 4.096V, 5.000V, 8.192V, and 10.000V. The minimum operating current in- creases from 60 µA for the LM4050-2.0 to 100 µA for the LM4050-10.0. All versions have a maximum operating cur- rent of 15 mA. LM4050s in the SOT-23 packages have a parasitic Schottky diode between pin 2 (−) and pin 3 (Die attach interface contact). Therefore, pin 3 of the SOT-23 package must be left floating or connected to pin 2. The 4.096V version allows single +5V 12-bit ADCs or DACs to operate with an LSB equal to 1 mV. For 12-bit ADCs or DACs that operate on supplies of 10V or greater, the 8.192V version gives 2 mV per LSB. The typical thermal hysteresis specification is defined as the change in +25˚C voltage measured after thermal cycling. The device is thermal cycled to temperature -40˚C and then measured at 25˚C. Next the device is thermal cycled to temperature +125˚C and again measured at 25˚C. The re- sulting V OUT delta shift between the 25˚C measurements is thermal hysteresis. Thermal hysteresis is common in preci- sion references and is induced by thermal-mechanical pack- age stress. Changes in environmental storage temperature, operating temperature and board mounting temperature are all factors that can contribute to thermal hysteresis. In a conventional shunt regulator application (Figure 1),an external series resistor (R S) is connected between the sup- ply voltage and the LM4050. R S determines the current that flows through the load (I L) and the LM4050 (IQ). Since load current and supply voltage may vary, R S should be small enough to supply at least the maximum guaranteed I RMIN (spec. table) to the LM4050 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, R S should be large enough so that the current flowing through the LM4050 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 LM4050’s reverse breakdown voltage, V R. Typical Applications 10104515 FIGURE 1. Shunt Regulator www.national.com 11 |
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