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TC1263-5.0VAT Folha de dados(PDF) 7 Page - Microchip Technology |
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TC1263-5.0VAT Folha de dados(HTML) 7 Page - Microchip Technology |
7 / 18 page © 2005 Microchip Technology Inc. DS21374C-page 7 TC1263 4.0 DETAILED DESCRIPTION The TC1263 is a precision, fixed-output LDO. Unlike bipolar regulators, the TC1263’s supply current does not increase with load current. In addition, VOUT remains stable and within regulation over the entire 0mA to ILOADMAX load current range (an important consideration in RTC and CMOS RAM battery back-up applications). Figure 4-1 shows a typical application circuit. FIGURE 4-1: Typical Application Circuit. 4.1 Output Capacitor A 1 µF (min.) capacitor from VOUT to ground is required. The output capacitor should have an Effective Series Eesistance (ESR) greater than 0.1 Ω and less than 5 Ω. A 1 µF capacitor should be connected from VIN to GND if there is either more than 10 inches of wire between the regulator and the AC filter capacitor or 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 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 by employing passive filtering techniques. 4.2 ERROR Output ERROR is driven low whenever VOUT falls out of regulation by more than – 5% (typ.). 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 4-2. Note that ERROR is active when VOUT is at or below VTH, and inactive when VOUT is above VTH + 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 C3). R1 x C3 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). FIGURE 4-2: ERROR Output Operation. C1 R1 1M V+ TC1263 VIN Battery VOUT ERROR SHDN GND VOUT 1µF + + Shutdown Control (to CMOS Logic or Tie to VIN, if unused) C2 1µF + C3 Required Only if ERROR is used as a Processor RESET Signal (See Text) C3 0.2 µF + BATTLOW or RESET VOUT VTH VOH Hysteresis (VHYS) VOL ERROR |
Nº de peça semelhante - TC1263-5.0VAT |
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Descrição semelhante - TC1263-5.0VAT |
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