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TC1269-3.3VUA bảng dữ liệu(PDF) 4 Page - Microchip Technology |
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TC1269-3.3VUA bảng dữ liệu(HTML) 4 Page - Microchip Technology |
4 / 12 page TC1269 DS21380C-page 4 2002-2012 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC1269 is a precision regulator available in fixed voltages. Unlike the bipolar regulators, the TC1269 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 backup applications). Figure 3-1 shows a typical application circuit. The regulator is enabled any time the shutdown input (SHDN) is at or above 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 microcontroller. 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 A (typical), VOUT falls to zero. FIGURE 3-1: TYPICAL APPLICATION CIRCUIT 3.1 Bypass Input A 470pF capacitor connected from the Bypass input to ground reduces noise present on the internal reference, which in turn significantly reduces output noise. If output noise is not a concern, this input may be left unconnected. Larger capacitor values may be used, but results in a longer time period to rated output voltage when power is initially applied. 3.2 Output Capacitor A 1 F (min) capacitor from V OUT to ground is recommended. The output capacitor should have an effective series resistance greater than 0.1 and less than 5.0 , and a resonant frequency above 1MHz. A 1 F capacitor should be connected from V IN 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. TC1269 1 2 3 4 6 7 8 NC NC GND Bypass NC SHDN Battery VOUT VOUT CBYPASS 470pF (Optional) Shutdown Control (from Power Control Logic) C1 1 µF VIN + C1 1 µF + + – |
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