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REG104FA-2.7KTTT Datasheet(PDF) 8 Page - Texas Instruments |
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REG104FA-2.7KTTT Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 22 page  SBVS025G REG104 8 BASIC OPERATION The REG104 series is a family of LDO (Low DropOut) linear regulators. The family includes five fixed output versions (2.5V to 5.0V) and an adjustable output version. An internal DMOS power device provides low dropout regulation with near constant ground pin current (largely independent of load and dropout conditions) and very fast line and load transient response. All versions include internal current limit and thermal shutdown circuitry. Figure 1 shows the basic circuit connections for the fixed voltage models. Figure 2 gives the connections for the adjustable output version (REG104A) and example resistor values for some commonly used output voltages. Values for other voltages can be calculated from the equation shown in Figure 2. FIGURE 1. Fixed Voltage Nominal Circuit for REG104. REG104 Enable V OUT C OUT V IN 0.1 µF C NR 0.01 µF Gnd NR In Out Optional FIGURE 2. Adjustable Voltage Circuit for REG104A. V OUT = (1 + R1/R2) • 1.295V Pin numbers for SOT-223 package. REG104 V IN 0.1 µF 3 1 Gnd V OUT R 1 C FB 0.01 µF C OUT Adj R 2 I ADJ Load 2 4 5 Enable To reduce current through divider, increase resistor values (see table at right). As the impedance of the resistor divider increases, I ADJ (~200nA) may introduce an error. C FB improves noise and transient response. V OUT (V) R 1 (Ω) (1) R 2 (Ω) (1) 1.295 Short Open 2.5 12.1k 13k 1.21k 1.3k 3 16.9k 13k 1.69k 1.3k 3.3 20k 13k 2.0k 1.3k 5 37.4k 13k 3.74k 1.3k NOTE: (1) Resistors are standard 1% values. EXAMPLE RESISTOR VALUES Optional Enable V Z = 10V 175k Ω FIGURE 3. Enable Pin Equivalent Input Circuit. None of the versions require an output capacitor for regulator stability. The REG104 will accept any output capacitor type less than 1 µF. For capacitance values larger than 1µF the effective ESR should be greater than 0.1 Ω. This minimum ESR value includes parasitics such as printed circuit board traces, solder joints, and sockets. A minimum 0.1 µF low ESR capacitor connected to the input supply voltage is recom- mended. 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 regulator 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 3, creating a nonlinear input impedance. |
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Similar Description - REG104FA-2.7KTTT |
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