XD9267/XD9268Series ■ BLOCK DIAGRAM XD9267/XD9268 Series VIN LocalReg Current SENSE EN/SS Chip Enable each circuit Curr ent Current Current fee d Limit Limit High back PFM Side Buffer Under Gate Lx Voltage CLAMP Lock Out Low Side Thermal each Buffer Shutdown circuit Operation Enable Vref + Soft Start Err Amp +PWM PWM/PFM FB - Comparator ControlLOGIC - GND Ramp OSC Wave PG (USP-6C Package Only) + - PowerGood Comparator *Diodes inside the circuit are an ESD protection diodes and a parasitic diodes. 2/26
