"Average input current limit: 5mA; 25mA; 50mA; 100mA; 250mA, 500mA, 1.2A, 1.9A (different versions)"
I have read the data sheet a few times and am unsure of information on these versions. If the below is correct then only 100mA (612994), 1.2A (612997), and an unknown limit(61299) version are orderable and that there is no orderable A version.
"The TPS61299 family provide wide input current limit from 5 mA to 1.9 A The non-A version device supports true shutdown function and A version device supports force pass through function at EN is low."
"For the high input current limit is 250mA, 500 mA, 1.2A and 1.9A version, at the beginning, when output voltage is lower than 0.5V, device limits the output power for the short protection. As output voltage is higher than 0.5V, the device operates at the boundary of Discontinuous Conduction Mode (DCM) and Continuous Conduction Mode (CCM), and the inductor peak current is limited to around 350mA during this stage. After the output voltage reaches close to 1.8V, the TPS61299x family starts to detect the output voltage configuration of the VSEL pins, then latches the configuration. The version detection time depends on the resistance at VSEL pin, the higher resistance, the longer version detection time. Eg. for 5V normal version, the TPS61299x family needs approximately 170μs for version detection. After version detection, TPS61299x family continues switching and output ramps up further. The internal soft-start time is approximately 1.3ms, and the output soft start time varies with the different output capacitance, load condition, and configuration conditions. The TPS61299x family limits the inductor average current lower than 500mA, (input current limit to 250mA for 250mA version) when output voltage is lower than 2.5V. In this way, the soft start function reduces the inrush current during startup. For the low input current limit 5mA, 25mA, 50mA and 100mA version, the device limits the input current limit to 25mA during the soft start. The device works at DCM during start up."
"For the input current limit is equal or higher than 250mA version, TPS61299, TPS612995, TPS612996 and TPS612997."
"For the input current limit equal or lower than 100mA version, TPS612991, TPS612992, TPS612993 and TPS612994. "
It is further unclear how the average current limit is enforced 9thermal shutdown, switch limiting of peak current, ...?).
