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ZLDO285 Datasheet(PDF) 7 Page - Diodes Incorporated |
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ZLDO285 Datasheet(HTML) 7 Page - Diodes Incorporated |
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7 / 9 page  3). Low Battery Flag The ZLDO285 provides an output called Low Battery Flag (LBF). Unlike many regulators that only signal that they are falling out of regulation, the LBF output of the ZLDO285 indicates that the voltage drop across the regulator has fallen to less than typically 300mV and so supply failure is imminent. This improved warning gives both more time for the system supplied to shutdown gracefully and maintains regulation while this happens. This could be a vital point if measurements are under way and must be completed accurately for instance. The LBF output is driven by an open collector NPN transistor which pulls low when the supply to the regulator is failing. Figure 3 shows this output being used. Note that resistor R1 is necessary only if the interrupt logic does not include a pull-up resistor. 4). Over Temperature Shutdown The ZLDO285 regulator includes an over temperature shutdown circuit that disables the regulator if its chip temperature should exceed 125°C for any reason. Although intended to provide a limited guard against excessive internal power dissipation, this circuit will shut down the regulator if its ambient rises above 125°C. Thus, the regulator could be used to disable a circuit in the event of the ambient temperature within which the circuit is mounted becoming too high. Any internal power dissipation caused as a result of supplying load current, will reduce the ambient temperature at which shutdown occurs. Note that to achieve the extremely low dropout voltage and high current performance provided by the ZLDO devices, the parts can be damaged by sustained output shorts or excessive loads when combined with high input supply voltages. To ensure reliable operation, keep loads within the SOA graph boundaries indicated in the typical characteristics. APPLICATIONS Figure 3 ZLDO285 Spg D/C Vout LBF SC Vin N/C Gnd ZLDO285 4.8V C2 1µF C1 10pF C3 100nF R1 100k 0V +2.85V Microproc. System Interrupt Input |
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Similar Description - ZLDO285 |
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