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CMPWR160SA Datasheet(PDF) 7 Page - California Micro Devices Corp |
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CMPWR160SA Datasheet(HTML) 7 Page - California Micro Devices Corp |
7 / 10 page CALIFORNIA MICRO DEVICES ©2000 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation. 12/5/2000 7 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com CMPWR160 Typical Transient Characteristics continued V CC Power down Figure 8 shows the output response of the regulator during a complete power down situation under full load conditions with SD tied to V CC. Figure 8. V CC Power Down Shutdown Transient Response The transient response of the output voltage to the SD pin is shown in Figure 9. The graph shows that a rising edge on the SD pin enables the regulator and a falling edge disables the regulator. The rise and fall time for the output voltages are 100µs and 200µs respectively. Figure 9. Shutdown Transient Response 3.50V (500mA Load) VCC VOUT M 2.00ms 1.00V Ch2 1.00V 25.0kS/s Tek Run Sample Ch2 3.0V (500mA Load) SD M 200µs 1.00V Ch2 2 5.00V 25.0kS/s Tek 3 Acqs Ch2 VOUT POR Response The transient response of the active low POR pin to V OUT is shown in Figure 10. When V OUT rises above the POR threshold voltage (typically 2.9V), the pin is forced to logic low (0V). The pin remains at logic low for 30ms then it is forced to logic high (3.3V). If V OUT falls below the POR threshold voltage during this 30ms interval POR will remain logic low. If it falls below the voltage threshold and then recovers the 30ms time will reset. When V OUT falls below the POR threshold voltage POR is immediately forced to logic low. V CC is tied to ground to show that the POR circuitry will work without V CC present. 2.90V POR M 10.0ms 1.00V Ch2 2 200mV 5.0kS/s Tek Run Sample Ch2 VOUT 2.7V 3.1V Figure 10. POR Response |
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