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LDCL015M33R Datasheet(PDF) 11 Page - STMicroelectronics |
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LDCL015M33R Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 17 page DocID022166 Rev 3 11/17 LDCL015 Application information 17 7 Application information 7.1 General operation The main feature of the LDCL015 is its capability to operate with or without input and output capacitors. To achieve this goal, the LDO architecture is based on a robust operational amplifier which has sufficient phase margin over all positions of the output capacitor pole. The LDCL015 can operate with a 100 nF output capacitor, but also without an output capacitor, showing in both configurations good supply voltage rejection, stability and dynamic performance. 7.2 Thermal and short-circuit protection The LDCL015 is self-protected from short-circuit condition and overtemperature. When the output load is higher than that supported by the device, the output current is increased until the limit of 220 mA (typ) is reached, at which point the current is kept constant even when the load impedance is zero. Thermal protection acts when the junction temperature reaches 170 °C. At this point the IC is completely shut down. As soon as the junction temperature falls back below 150 °C, the device begins operating again. To calculate the maximum power that the device can dissipate while keeping the junction temperature below the TJ-OP, the following formula is used: Equation 1 PDMAX = (125-TAMB) / RthJA 7.3 Output voltage setting for ADJ version In the adjustable version, the output voltage can be set from 0.8 V up to the input voltage, minus the voltage drop across the pass transistor (dropout voltage), by connecting a resistor divider between the ADJ pin and the output, thus allowing remote voltage sensing. The resistor divider should be selected using the following equation: Equation 2 VOUT = VADJ (1 + R1 / R2), with VADJ = 0.8 V (typ.) It is recommended to use resistors with values in the range of 10 k Ω to 50 kΩ. Lower values can also be suitable, but will increase current consumption. 7.4 Enable pin The LDCL015 features an enable function. When the EN voltage is higher than 2 V, the device is ON; if it is lower than 0.8 V, the device is OFF. In shutdown mode, the current consumption is lower than 1 µA. The EN pin does not have an internal pull-up, which means that it cannot be left floating if it is not used. |
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