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TC1173-xxVUA Datasheet(PDF) 4 Page - Microchip Technology |
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TC1173-xxVUA Datasheet(HTML) 4 Page - Microchip Technology |
4 / 14 page TC1173 DS21362C-page 4 2002-2012 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC1173 is a fixed output, low drop-out regulator. Unlike bipolar regulators, the TC1173’s supply current does not increase with load current. In addition, VOUT remains stable and within regulation over the entire 0mA to IOUTMAX operating load current range, (an important consideration in RTC and CMOS RAM battery back-up applications). Figure 3-1 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 A (typical), VOUT falls to zero and ERROR is disabled. FIGURE 3-1: TYPICAL APPLICATION CIRCUIT 3.1 ERROR 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 (typ.) for a 5.0V regulator and 2.85V (typ.) for a 3.0V regulator). ERROR output operation is shown in Figure 3-2. Note that ERROR is active when VOUT is at or below VTH, and inactive when VOUT is above VTH + VH. As shown in Figure 3-1, ERROR can be used as a battery low flag, or as a processor RESET signal (with the addition of timing capacitor C3). R1 x C3 should be chosen to maintain ERROR below VIH of the processor RESET input for at least 200 msec 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). FIGURE 3-2: ERROR OUTPUT OPERATION 3.2 Output Capacitor A 1 F (min) capacitor from V OUT to ground is recommended. The output capacitor should have an effective series resistance greater than 0.1 and less than 5.0 . A 1F capacitor should be connected from VIN to GND if there is more than 10 inches of wire between the regulator and the AC filter capacitor, or if a battery is used as the power source. Aluminum electrolytic or tantalum capacitor types can be used. (Since many aluminum electrolytic capacitors freeze at approximately -30°C, solid tantalums are recom- mended 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. 3.3 Bypass Input A 470pF capacitor connected from the Bypass input to ground reduces noise present on the internal reference, which in turn significantly reduces output noise. If output noise is not a concern, this input may be left unconnected. Larger capacitor values may be used, but results in a longer time period to rated output voltage when power is initially applied. TC1173 1 2 3 4 VOUT VOUT CBYPASS 470pF (Optional) Shutdown Control (from Power Control Logic) C1 1 μF GND NC Bypass VIN NC SHDN + ERROR 5 6 7 8 C3 required only if ERROR is used as a processor RESET signal. (see text) Battery RESET or Battery Low R3 1M C2 1 μF C3 0.2 μF + + – VTH VOUT ERROR VIH VOL HYSTERESIS (VH) |
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