SLVSEN7D april 2019 – may 2023 TPS7H4001-SP
PRODMIX
Refer to the PDF data sheet for device specific package drawings
The device uses the lower voltage of the internal voltage reference or the SS/TR pin voltage as the reference voltage and regulates the output accordingly. A CSS capacitor on the SS/TR pin to GND implements a soft-start time. Equation 5 shows the equation for the nominal soft-start time, tSS. This is the time it will take VOUT to go from 10% to 90% of the programmed voltage. The voltage reference (VREF) is 0.604 V and the soft-start charge current (ISS) is 2.5 μA. When calculating the soft-start time tSS, it is important to take into account the variation of the parameters CSS, VREF and ISS as these may cause tSS to deviate from the nominal value in the actual implementation.
When any of the following four scenarios occur the SS/TR pin is discharged:
The device will enter into a pulse-skipping mode during startup in the event that VSENSE is greater than the voltage at the SS/TR pin. During this period, the high-side switch will remain off and the low-side switch will remain on until VSENSE again falls below the voltage at SS/TR.