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SC560xULTRT Datasheet(PDF) 11 Page - Semtech Corporation |
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SC560xULTRT Datasheet(HTML) 11 Page - Semtech Corporation |
11 / 15 page SC560 11 Applications Information (continued) The values of the resistors in the voltage divider network can be calculated using the equation: 2 2 1 REF OUT R R R V V where V REF = 1V. The value of R2 should be 100kΩ or less to ensure noise performance and stability. Values significantly less than 100kΩ will impact the quiescent current. Protection Features The SC560 family provides the following protection features to ensure that no damage is incurred in the event of a fault condition: Under-Voltage Lockout Over-Temperature Protection Short-Circuit Protection Under-Voltage Lockout The Under-Voltage Lockout (UVLO) circuit protects the device from operating in an unknown state if the input voltage supply is too low. When the V IN drops below the UVLO threshold, the LDOs are disabled and PGOOD is held low (SC560C and fixed output variants only). When V IN is increased above the hysteresis level, the LDOs are re-enabled into their previous states, provided EN has remained high. When powering up with V IN below the UVLO threshold, the LDOs remain disabled and PGOOD is held low (SC560C and fixed output variants only). Over-Temperature Protection An internal Over-Temperature (OT) protection circuit is provided that monitors the internal junction temperature. When the temperature exceeds the OT threshold as defined in the Electrical Characteristics section, the OT protection disables both LDO outputs and holds the PGOOD signal low. When the junction temperature drops below the hysteresis level, the LDOs are re-enabled into their previous states and PGOOD transitions high after a 200ms delay, provided EN has remained high (SC560C and fixed output variants only). • • • Short-Circuit Protection Each output has short-circuit protection. If the output current exceeds the current limit, the output voltage will drop and the output current will be limited until the load current returns to a specified level. If a short-circuit occurs on the output of LDOA, the output of LDOB will also be disabled until the fault is removed and the load current returns to a specified level. Component Selection A capacitance of 1μF or larger on each output is recommended to ensure stability. Ceramic capacitors of type X5R or X7R should be used because of their low ESR and stable temperature coefficients. It is also recommended that the input be bypassed with a 2.2μF, low ESR X5R or X7R capacitor to minimize noise and improve transient response. Note: Tantalum and Y5V capacitors are not recommended. The BYP pin on the SC560D and the fixed output versions must have a minimum of 22nF connected to ground to meet all noise-sensitive requirements. Increasing the capacitance to 100nF will further improve PSRR and output noise. |
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