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TC1300VUA Arkusz danych(PDF) 8 Page - Microchip Technology |
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TC1300VUA Arkusz danych(HTML) 8 Page - Microchip Technology |
8 / 16 page TC1300 DS21385C-page 8 2002 Microchip Technology Inc. 3.0 DETAILED DESCRIPTION The TC1300 is a combination of a fixed output, low dropout regulator and a microcontroller monitor/RESET. Unlike bipolar regulators, the TC1300 supply current does not increase with load current. In addition, VOUT remains stable and within regulation over the entire specified operating load range (0 mA to 300 mA) and operating input voltage range (2.7V to 6.0V). Figure 3-1 shows a typical application circuit. The reg- ulator is enabled any time the shutdown input (SHDN) is above VIH. The regulator is shutdown (disabled) when SHDN is at or below VIL. SHDN may be con- trolled by a CMOS logic gate or an 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 shut- down, supply current decreases to 30 µA (typical), VOUT falls to zero and RESET remains valid. 3.1 RESET Output The RESET output is driven active-low within 160 µsec of VDET falling through the reset voltage threshold. RESET is maintained active for a minimum of 140 msec after VDET rises above the reset threshold. The TC1300 has an active-low RESET output. The out- put of the TC1300 is valid down to VDET = 1V and is optimized to reject fast transient glitches on the VDET line. FIGURE 3-1: Typical Application Circuit. 3.2 Output Capacitor A 1 µF (min) capacitor from VOUT to ground is required. A 1 µF capacitor should also 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. As with all low dropout regulators, a minimum output capacitance is required to stabilize the output voltage. For the TC1300, a mini- mum of 1 µF of output capacitance is enough to stabi- lize the device over the entire operating load and line range. The selected output capacitor plays an impor- tant role is compensating the LDO regulator. For the TC1300, the selected output capacitor equivalent series resistance (ESR) range is 0.1 ohms to 5 ohms when using 1 µF of output capacitance, and 0.01 ohms to 5 ohms when using 10 µF of output capacitance. Because of the ESR requirement, tantalum and alumi- num electrolytic capacitors are recommended. Alumi- num electrolytic capacitors are not recommended for operation at temperatures below -25°C. When operat- ing from sources other than batteries, rejection and transient responses can be improved by increasing the value of the input and output capacitors and employing passive filtering techniques. 3.3 Bypass Input (Optional) An optional 470 pF capacitor connected from the Bypass input to ground reduces noise present on the internal reference, which in turn significantly reduces output noise and improves PSRR performance. 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. 3.4 Turn On Response The turn-on response is defined as two separate response categories, Wake-Up Time (tWK) and Settling Time (tS). The TC1300 has a fast Wake-Up Time (10 µsec typi- cal) when released from shutdown. See Figure 3-2 for the Wake-Up Time designated as tWK. The Wake-Up Time is defined as the time it takes for the output to rise to 2% of the VOUT value after being released from shutdown. The total turn-on response is defined as the Settling Time (tS) (see Figure 3-2). Settling Time (inclusive with tWK) is defined as the condition when the output is within 2% of its fully enabled value (50 µsec typical) when released from shutdown. The settling time of the output voltage is dependent on load conditions and output capacitance on VOUT (RC response). FIGURE 3-2: Wake-Up Response Time. TC1300 1 2 3 4 5 6 7 8 V OUT C BYPASS 470 pF (Optional) Shutdown Control (from Power Control Logic) GND Bypass V IN SHDN V OUT C1 1µF RESET V DET NC C2 1µF Battery V DET RESET Microcontroller V IH t S t WK V OUT 98% 2% V IL SHDN |
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