The resistor divider code for MSEL2 pin of the loop controller device (U1) selects the soft-start values. The resistor to AGND determines the number of devices sharing common output and the overcurrent thresholds. Use Table 8-10 and Table 8-11 to select the resistor values. In this two-phase design, the desired settings can be selected by floating the MSEL2 pin. This selects 3-ms soft-start time, the highest current limit thresholds and two-phase configuration.

In stackable configuration, follower modules use the resistor from MSEL2 to AGND to program IOUT_OC_WARN_LIMIT, IOUT_OC_FAULT_LIMIT, MFR_SPECIFIC_28 (STACK_CONFIG), and INTERLEAVE. The loop follower receive all other pin programmed values from the loop controller over the back-channel communication (BCX_CLK and BCX_DAT) as part of the power-on reset function. In this two-phase design, the desired settings can be selected by shorting the MSEL2 pin of the loop follower device to AGND. This selects the highest current limit thresholds and programs the loop follower device to be the 180° out of phase from the loop controller device.