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TC1303B-AA1EMF Datasheet(PDF) 21 Page - Microchip Technology |
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TC1303B-AA1EMF Datasheet(HTML) 21 Page - Microchip Technology |
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21 / 36 page  © 2005 Microchip Technology Inc. DS21949B-page 21 TC1303A/TC1303B/TC1303C/TC1304 4.4 Power-Good A Power-Good (PG) output signal is generated based off of the buck regulator output voltage (VOUT1), the LDO output voltage (VOUT2) or the combination of both outputs. A fixed delay time of approximately 262 ms is generated once the monitored output voltage is above the power-good threshold (typically 94% of VOUTX). As the monitored output voltage falls out of regulation, the falling PG threshold is typically 92% of the output voltage. The PG output signal is pulled up to the output voltage, indicating that power is good and pulled low, indicating that the output is out of regulation. The typi- cal quiescent current draw for power-good circuitry is less than 10 µA. If the monitored output voltage falls below the power- good threshold, the power-good output will transition to the Low state. The power-good circuitry has a 165 µs delay when detecting a falling output voltage. This helps to increase the noise immunity of the power-good output, avoiding false triggering of the PG signal during line and load transients. FIGURE 4-1: Power-Good Timing. 4.5 Power Good Output Options There are three monitoring options for the TC1303 family. For the TC1303A, only the buck regulator output voltage (VOUT1) is monitored. The PG output signal depends only on VOUT1. For the TC1303B, only the LDO output voltage (VOUT2) is monitored. The PG output signal depends only on VOUT2. For the TC1303C and TC1304, both the buck regulator output voltage and LDO output voltage are monitored. If either one of the outputs fall out of regulation, the PG will be low. Only if both VOUT1 and VOUT2 are within the PG voltage threshold limits will the PG output be high. For the TC1303A,C and TC1304, the PG output pin is open drain and can be pulled up to any level within the given absolute maximum ratings (AGND - 0.3V) to (VIN + 0.3V). TABLE 4-1: PG AVAILABLE OPTIONS tRPU tRPD VTH_H VOUT1 PG VOL VOH or VOUT2 Part Number PG Output Buck (VOUT1) PG Output LDO (VOUT2) PG Output Type TC1303A Yes No Open-Drain TC1303B No Yes Push-Pull (VOUT2) TC1303C Yes Yes Open-Drain TC1304 Yes Yes Open-Drain |
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