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XRP6274EVB Datasheet(PDF) 8 Page - Exar Corporation |
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XRP6274EVB Datasheet(HTML) 8 Page - Exar Corporation |
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8 / 11 page  XRP6274 2A Ultra Low Dropout Voltage Regulator © 2015 Exar Corporation 8/11 Rev. 2.0.0 input voltage falls below a lower boundary of operation. SOFT START The XRP6274 features a soft-start which controls the output voltage ramp and allows the regulator to gradually reach the initial steady state operating point. This reduces current spikes and surges at start up due to output capacitor inrush current. Internal sequencing completes in 50us, and then the reference voltage is linearly ramped over a period of approximately 2ms. The inrush current will be the lesser of the current limit value or the current defined by the equation below: ���������������������������� = ���������������� ���������������� 2000�������� POWER GOOD FLAG The XRP6274 features a Power Good Flag output signaling an abnormal operating condition. A low voltage on the Power Good Flag output indicates: - Output voltage VOUT is approximately 9% below its expected value - A thermal fault has occurred The Power Good Flag output, is an open collector capable of sinking in excess of 1mA. OUTPUT CURRENT LIMIT PROTECTION The XRP6274 integrates output current limit protection in order to protect the system main power supply, the regulator itself and the load from excessive current flow. This current limit effectively keeps the flow of current in the circuit at a safe level. In short circuit conditions, the device will take additional steps to limit input and power by disabling and re-enabling the pass device until the short condition is removed and normal operation can resume. Depending on the impedance of the short, this short circuit protection function may initiate operation between 10% and 50% of the targeted output voltage THERMAL PROTECTION AND SHUTDOWN The XRP6274 includes a thermal shutdown circuitry in order to restrict the device’s operating temperature within a safe operating range. When activated, typically at 160°C, the XRP6274 is forced into a low power reset state with a typical hysteresis of 30 degrees. Combined with the short circuit current protection, it reduces and limits the heating effects of over-temperature and/or over- current conditions on the LDO and surrounding circuits. REVERSE BIAS PROTECTION In addition to the standard protection features in these devices, they also incorporate a reverse bias protection. Most LDOs have a parasitic body diode that provides a path from VOUT to VIN if the input is shorted to ground. The XRP6274 has a blocking diode to ensure that no high discharge currents can occur between the output and the input when the input is shorted to ground. |
Similar Part No. - XRP6274EVB |
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