The following table summarizes the dual threshold levels of the undervoltage lockout (EN/UVLO) circuit explained in Enable / Undervoltage Lockout (EN/UVLO).
|EN/UVLO PIN VOLTAGE||VCC REGULATOR||MODE||DESCRIPTION|
|< 0.35 V||Off||Shutdown||VCC regulator disabled. High-side and low-side FETs disabled.|
|0.35 V to 1.24 V||On||Standby||VCC regulator enabled. High-side and low-side FETs disabled.|
|> 1.24 V||VCC < VCC(UV)||Standby||VCC regulator enabled. High-side and low-side FETs disabled.|
|VCC > VCC(UV)||Operating||VCC regulator enabled. Switching enabled.|
If input UVLO is not required, EN/UVLO can be driven by a logic signal as an enable input or connected directly to VIN. If EN/UVLO is directly connected to VIN, the regulator begins switching when VCC(UV) = 3.98 V (typical) is satisfied.