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TCN4040D-2.5EZB Datasheet(PDF) 4 Page - TelCom Semiconductor, Inc |
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TCN4040D-2.5EZB Datasheet(HTML) 4 Page - TelCom Semiconductor, Inc |
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4 / 9 page  TCN4040 4 PRELIMINARY INFORMATION TCN4040-01 6/16/97 PRECISION MICROPOWER SHUNT VOLTAGE REFERENCE APPLICATIONS INFORMATION Available in a space saving SOT-23B-3 surface mount package, the TCN4040 is a precision micro-power curva- ture-corrected bandgap shunt voltage reference. The TCN4040 is designed for stable operation without an exter- nal capacitor connected between the “+” pin and the “–” pin. The TCN4040 also remains stable, however, if a bypass capacitor is used. The minimum operating current increase is 60mA and the maximum operating current is 15mA. The TCN4040, in the SOT-23B-3 package has a para- sitic Schottky diode between pin 3 (–) and pin 1. (Die attach interface contact). Therefore, pin 1 of the SOT-23B-3 pack- age must be left floating or connected to pin 3. In a conventional shunt regulator application, an exter- nal series resistor (RS) is connected between the supply voltage and the TCN4040 (Figure 1). RS determines the current that flows through the load (IL) and the TCN4040 (IQ). Even when the supply voltage is at its minimum, and the load current is at its maximum value, RS should be small enough to supply at least the minimum acceptable IQ to the TCN4040 since load current and supply voltage may vary. Conversely, when the supply voltage is at its maximum and IL is at its minimum, RS should be large enough that the current flowing through the TCN4040 is less than 15mA. Figure 1. Shunt Regulator RS IL IQ + IL IQ VR VS TCN4040 RS is determined by the supply voltage, (VS), the load and operating current, (IL and IQ), and the TCN4040’s reverse breakdown voltage, VR. VS – VR RS = IL + IQ |
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Similar Description - TCN4040D-2.5EZB |
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