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TC1263 数据表(PDF) 4 Page - Microchip Technology |
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TC1263 数据表(HTML) 4 Page - Microchip Technology |
4 / 14 page TC1263 DS21374B-page 4 © 2002 Microchip Technology Inc. 3.0 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 3-1 shows a typical application circuit. FIGURE 3-1: TYPICAL APPLICATION CIRCUIT 3.1 Output Capacitor A1 µF(min) capacitor from VOUT to ground is required. The output capacitor should have an effective series resistance greater than 0.1 Ω and less than 5Ω, and a resonant frequency above 1MHz. A 1 µF 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 recommended for applications operating below -25°C.) When operating from sources other than batteries, supply-noise rejection and transient response canbeimprovedbyincreasingthe value of the input and output capacitors and employing passive filtering techniques. 3.2 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 canbe usedas 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 1 µF C1 0.2 µF R1 1M V+ C3 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 TC1263 VIN Battery VOUT ERROR SHDN GND VOUT 1 µF C2 C3 + + + + VOUT VTH VIH HYSTERESIS (VH) VOL ERROR |
类似零件编号 - TC1263 |
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类似说明 - TC1263 |
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