JAJSLU5B December 2021 – August 2024 TPS63901
PRODUCTION DATA
The device has a soft-start feature that starts the device typically with 500-mA peak current limit until VO = 1.8 V and 500 µs elapsed when the input current limit is set to unlimited (see Section 6.3.4). Afterward, the output voltage ramps in a series of discrete steps (see Figure 6-6).
The total soft-start ramp-up time can be calculated with Equation 2.
where
Figure 6-6 shows a typical start-up case.
Figure 6-7 illustrates the start-up step size behavior.
Table 6-1 shows the typical start-up time for a number of standard output voltages.
Output Voltage | Soft-Start Ramp-Up Time (tr(SS)) | Start-Up Time (td(EN) + tr(SS)) |
---|---|---|
1.8 V | 0.5 ms | 2 ms |
2.5 V | 1.375 ms | 2.875 ms |
3.3 V | 2.375 ms | 3.875 ms |
5 V | 4.5 ms | 6 ms |
If the output is prebiased – that is, the initial output voltage is not zero – the start-up behavior is as follows: