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TC2055-3.0VCTTR Datenblatt(PDF) 11 Page - Microchip Technology |
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TC2055-3.0VCTTR Datenblatt(HTML) 11 Page - Microchip Technology |
11 / 22 page © 2009 Microchip Technology Inc. DS21663D-page 11 TC2054/2055/2186 4.0 DETAILED DESCRIPTION The TC2054, TC2055 and TC2186 are precision fixed output voltage regulators. (If an adjustable version is desired, refer to the TC1070/TC1071/TC1187 data sheet (DS21353). Unlike bipolar regulators, the TC2054, TC2055 and TC2186 supply current does not increase with load current. In addition, V OUT remains stable and within regulation over the entire 0 mA to maximum output current operating load range. Figure 4-1 shows a typical application circuit. The regulator is enabled any time the shutdown input (SHDN) is at or above VIH, and shutdown (disabled) when SHDN is at or below VIL. SHDN may be controlled by a CMOS logic gate, or I/O port of a microcontroller. If the SHDN input is not required, it should be connected directly to the input supply. While in shutdown, supply current decreases to 0.05 µA (typical), VOUT falls to zero volts, and ERROR is open-circuited. FIGURE 4-1: Typical Application Circuit. 4.1 ERROR Open-Drain Output ERROR is driven low whenever VOUT falls out of regulation by more than -5% (typical). This condition may be caused by low input voltage, output current limiting or thermal limiting. The ERROR threshold is 5% below rated VOUT regardless of the programmed output voltage value (e.g. ERROR = VOL at 4.75V (typical) for a 5.0V regulator and 2.85V (typical) for a 3.0V regulator). ERROR output operation is shown in Figure 4-2. Note that ERROR is active when VOUT falls to VTH, and inactive when VOUT rises above VTH by VHYS. As shown in Figure 4-1, ERROR can be used as a battery low flag or as a processor RESET signal (with the addition of timing capacitor C2). R1 x C2 should be chosen to maintain ERROR below VIH of the processor RESET input for at least 200 ms to allow time for the system to stabilize. Pull-up resistor R1 can be tied to VOUT, VIN or any other voltage less than (VIN + 0.3V). The ERROR pin sink current is self-limiting to approximately 18 mA. FIGURE 4-2: Error Output Operation. 4.2 Output Capacitor A 1 µF (minimum) capacitor from VOUT to ground is required. The output capacitor should have an effective series resistance of 0.01 Ω. to 5Ω for V OUT = 2.5V, and 0.05 Ω. to 5Ω for V OUT < 2.5V. Ceramic, tantalum and aluminum electrolytic capacitors can be used. (Since many aluminum electrolytic capacitors freeze at approximately -30°C, solid tantalums are recommended for applications operating below -25°C). When operating from sources other than batteries, supply-noise rejection and transient response can be improved by increasing the value of the input and output capacitors and employing passive filtering techniques. 4.3 Input Capacitor A 1 µF capacitor should be connected from VIN to GND if there is more than 10 inches of wire between the regulator and this AC filter capacitor, or if a battery is used as the power source. Aluminum electrolytic or tantalum capacitors can be used (since many aluminum electrolytic capacitors freeze at approximately -30°C, solid tantalum are recommended for applications operating below -25°C). When operating from sources other than batteries, supply-noise rejection and transient response can be improved by increasing the value of the input and output capacitors and employing passive filtering techniques. 0.2 µF C2 R1 1M Ω V+ C2 Required Only if ERROR is used as a Processor RESET Signal (See Text) Shutdown Control (to CMOS Logic or Tie to VIN if unused) BATTLOW or RESET TC2054 TC2055 TC2186 VIN BATTERY VOUT GND 1µF VOUT 1µF C1 ERROR SHDN VIH VOL ERROR VTH VOUT HYSTERESIS (VHYS) |
Ähnliche Teilenummer - TC2055-3.0VCTTR |
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Ähnliche Beschreibung - TC2055-3.0VCTTR |
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