ADVANCE INFORMATION for pre-production products; subject to change without notice.
The internal Soft-Start circuitry controls the output voltage slope during startup. This avoids excessive inrush current and ensures a controlled output voltage rise time. It also prevents unwanted voltage drops from high impedance power sources or batteries. When EN is set high to start operation, the device starts switching after a delay of about 200 μs then the internal reference and hence VOUT rises with a slope controlled by an external capacitor connected to the SS/TR pin.
Leaving the SS/TR pin un-connected provides the fastest startup ramp with 160 µs typically. A capacitor connected from SS/TR to GND is charged with 2.5 µA by an internal current source during soft start until it reaches the reference voltage of 0.6 V. The capacitance required to set a certain ramp-time (tramp) therefore is:
If the device is set to shutdown (EN = GND), undervoltage lockout or thermal shutdown, an internal resistor pulls the SS/TR pin to GND to ensure a proper low level. Returning from those states causes a new startup sequence.
A voltage applied at SS/TR can be used to track a master voltage. The output voltage follows this voltage in both directions up and down in forced PWM mode. In PFM mode, the output voltage decreases based on the load current. The SS/TR pin must not be connected to the SS/TR pin of other devices.