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TC1223-XXVCT Datasheet(PDF) 4 Page - Microchip Technology |
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TC1223-XXVCT Datasheet(HTML) 4 Page - Microchip Technology |
4 / 14 page TC1223/TC1224 DS21368B-page 4 © 2002 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC1223 and TC1224 are precision fixed output voltage regulators. Unlike bipolar regulators, the TC1223 and TC1224’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)isatorabove 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 micro- controller. 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 µA(typical) and VOUT fallstozerovolts. FIGURE 3-1: TYPICAL APPLICATION CIRCUIT 3.1 Output Capacitor A1 µF(min) capacitor from VOUT to ground is recommended. The output capacitor should have an effective series resistance greater than 0.1 Ω and less than 5.0 Ω, 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 approxi- mately -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. TC1223 TC1224 VOUT SHDN GND NC 1 µF + VIN VOUT Shutdown Control (to CMOS Logic or Tie to VIN if unused) 1 µF + Battery + |
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