The device can also work for up to a 20-A load current when powering from a 3.3-V bus with a single VIN configuration. To ensure the internal analog circuitry and the gate drives are powered up properly, VCC pin must be shorted to VIN pins with low impedance trace. A trace with at least 24-mil width is recommended. A 2.2-µF, at least 6.3-V rating, VCC-to-PGND decoupling capacitor is still recommended to be placed as close as possible to VCC pin. Due to the maximum rating limit on VCC pin, the VIN input range under this configuration is 3 V to 3.6 V. The input voltage must stay higher than both VIN UVLO and VCC UVLO, otherwise the device will shut down immediately. Figure 7-6 shows an example for this single VIN configuration.

VIN and EN are the two signals to enable the part. For start-up sequence, any sequence between the VIN and EN signals can power the device up correctly.

Figure 7-6 Single VIN Configuration For 3.3-V Bus