SLVSAX2B September 2011 – June 2020 TPS61170-Q1
PRODUCTION DATA.
Soft-start circuitry is integrated into the IC to avoid a high inrush current during start-up. After the device is enabled by a logic high signal on the CTRL pin, the FB pin reference voltage ramps up in 32 steps, with each step taking 213 μs. This ensures that the output voltage rises slowly to reduce inrush current. Additionally, for the first 5 ms after the COMP voltage ramps, the current limit of the PWM switch is set to half of the normal current limit specification or below 700 mA (typical). For a typical example, see the start-up waveform (Figure 9).