AS3728-BWLT

AS3728 8A Power Stage The AS3728 is a companion power stage, intended to be used General Description with AS372x products. It cannot be used without a DCDC controller. It contains the power FETs for 2 phases and is capable to handle output currents up of 4A per phase. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of AS3728, 8A Power Stage are listed below: Figure 1: Added Value of Using AS3728 Benefits Features Support for single or dual phase operation 2 phases with separate control input Separate power low-side NMOS & high-side NMOS for 4A per phase 2 x 4A output stages are running on 1.3MHz Separate coil current feedback per phase Stand-alone zero-crossing operation Over temperature protection Integrated temperature monitoring Cost effective, small package WL-CSP24 with 0.4mm pitch Applications The device is a high current dual-phase DCDC and ideal for: Mobile phones Tablets Notebooks ams Datasheet Page 1 v1-03 2015-Aug-31 Document FeedbackAS37 28 Gene ral Des c rip t ion Block Diagram The functional blocks of this device for reference are shown below: Figure 2: AS3728 Block Diagram 5VSUP HVSUP BOOST1 VSUP clk TEMP Ngate PWM PWM Logic Isense CTRL2 ov curr 1uH LX 1 CTRL1 CTRL1 47uF Ngate Zcomp Vov current Logic RCSNS Current sense ramp PVSS VRef FB error ota VSS AS3728 Block Diagram: This figure shows the block diagram of the DCDC controller inside the Main PMIC and the AS3728 Power Stage with all relevant system components. Page 2 ams Datasheet Document Feedback v1-03 2015-Aug-31