APW7068 Datasheet | Anpec Electronics Coropration

Features General Description - Two Regulated Voltages and REF_OUT - Synchronous Buck Converter - Linear Regulator - REF_OUT = 0.8V±1% with 3m A 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 pact QFN4x4-16 packages - Lead Free and Green Devices Available (Ro HS pliant) 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 300k Hz 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 temperature-pensated ref- erence voltage is designed to meet the requirement of low output voltage applications. The APW7068 with excellent protection functions: POR, OCP, OVP and UVP. The Power-On-Reset (POR) circuit can monitor V supply voltage exceeds its threshold CC12 voltage while the controller is running, and a built-in digi- tal soft-start provides both outputs with controlled rising voltage. The Over-Current Protection (OCP) monitors the output current by using the voltage drop across the lower MOSFET’s R , paring with the voltage of OCSET DS(ON) pin, V The...