APW7068

APW7068 Synchronous Buck PWM and Linear Controller with 0.8V Reference Out Voltage Features General Description Two Regulated Voltages and REF_OUT - Synchronous Buck Converter - Linear Regulator - REF_OUT = 0.8V±1% with 3mA Source Current Single 12V Power Supply Required Excellent Both Output Voltage Regulation - 0.8V Internal Reference - ±1% Over Line Voltage and Temperature Integrated Soft-Start for PWM and Linear Outputs 300KHz Fixed Switching Frequency Voltage Mode PWM Control Design and Up to 89% (Typ.) Duty Cycle Under-Voltage Protection Monitoring Linear Output Over-Voltage Protection Monitoring PWM Output Over-Current Protection for PWM Output - Sense Low-side MOSFET’s RDS(ON) SOP-14, SSOP-16 and Compact QFN4x4-16 packages Lead Free and Green Devices Available (RoHS Compliant) Applications Graphic Cards Simplified Application Circuit 12V VIN2 Q3 VOUT2 Linear PWM Controller Controller VIN1 Q1 L VOUT1 Q2 The APW7068 integrates synchronous buck PWM, linear controller, and 0.8V Reference Out Voltage, as well as the monitoring and protection functions into a single package. The fixed 300kHz switching frequency synchro- nous PWM controller drives dual N-channel MOSFETs, which provides one controlled power output with over- voltage and over-current protections. Linear controller drives an external N-channel MOSFET with under-volt- age protection. The APW7068 provides excellent regulation for output load variation. An internal 0.8V ...