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TC1264-2.5VAB 데이터시트(PDF) 6 Page - Microchip Technology |
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TC1264-2.5VAB 데이터시트(HTML) 6 Page - Microchip Technology |
6 / 18 page TC1264 DS21375C-page 6 © 2006 Microchip Technology Inc. 4.0 DETAILED DESCRIPTION The TC1264 is a precision, fixed output LDO. Unlike bipolar regulators, the TC1264’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 resistance greater than 0.1 Ω and less than 5Ω. 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 can be improved by increasing the value of the input and output capacitors and employing passive filtering techniques. TC1264 VIN VOUT C1 1µF GND VOUT VIN SHDN + |
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