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TC1108-xxVDB Datasheet(PDF) 3 Page - Microchip Technology |
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TC1108-xxVDB Datasheet(HTML) 3 Page - Microchip Technology |
3 / 12 page 2002-2012 Microchip Technology Inc. DS21357C-page 3 TC1108 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE 3.0 DETAILED DESCRIPTION The TC1108 is a precision, fixed output LDO. Unlike bipolar regulators, the TC1108’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. FIGURE 3-1: TYPICAL APPLICATION CIRCUIT 3.1 Output Capacitor A 1 F (min) capacitor from V OUT to ground is required. 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 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. Pin No. (3-Pin SOT-223) Symbol Description 1VIN Unregulated supply input. 2 GND Ground terminal. 3VOUT Regulated voltage output. C1 1 μF Battery TC1108 1 2 3 VIN VOUT C2 1 μF GND VOUT + – + + |
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