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REG103FA-3.3KTTT Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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REG103FA-3.3KTTT Datasheet(HTML) 9 Page - Burr-Brown (TI) |
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9 / 27 page  REG103 9 SBVS010D 0 2 4 6 8 10 12 14 16 100 10 1 0.1 0.01 0.001 Enable Voltage FIGURE 5. ENABLE Pin Current versus Applied Voltage. REG103 ERROR +5V 10k Ω Pull-up 3 ENABLE SO-8 Package Only 6 Open Drain µP FIGURE 6. ERROR Pin Typical Fault-Monitoring Circuit. ENABLE The ENABLE pin allows the regulator to be turned on and off. This pin is active HIGH and compatible with standard TTL-CMOS levels. Inputs below 0.5V (max) turn the regu- lator off and all circuitry is disabled. Under this condition, ground pin current drops to approximately 0.5 µA. When not used, the ENABLE pin may be connected to VIN. Internal to the part, the ENABLE pin is connected to an input resistor-zener diode circuit, as shown in Figure 4, creating a nonlinear input impedance. The ENABLE Pin Current versus Applied Voltage relationship is shown in Figure 5. When the ENABLE pin is connected to a voltage greater than 10V, a series resistor may be used to limit the current. ENABLE V Z = 10V 175k Ω FIGURE 4. ENABLE Pin Equivalent Input Circuit. FIGURE 3. Foldback Current Limit and Boost Circuit. 0 100 200 300 400 500 600 700 800 3.5 3 2.5 2 1.5 1 0.5 0 Output Current (mA) REG103 V IN 0.1 µF Gnd R BOOST V OUT + 0.1 µF(1) Load + (1) Optional. (a) Foldback Current Limit of the REG103-3.3 at 25 °C. (b) Foldback Current Boost Circuit. ERROR FLAG The error indication pin, only available on the SO-8 package version, provides a fault indication out-of-regulation condi- tion. During a fault condition, ERROR is pulled LOW by an open drain output device. The pin voltage, in the fault state, is typically less than 0.2V at 500 µA. A fault condition is indicated when the output voltage differs (either above or below) from the specified value by approxi- mately 10%. Figure 6 shows a typical fault-monitoring application. OUTPUT NOISE A precision band-gap reference is used for the internal reference voltage, VREF, for the REG103. This reference is the dominant noise source within the REG103. It generates approximately 45 µVrms in the 10Hz to 100kHz bandwidth at the reference output. The regulator control loop gains up the reference noise, so that the noise voltage of the regulator is approximately given by: V Vrms RR R Vrms V V N OUT REF =µ + =µ • 45 2 45 12 |
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