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The RT6543A/B PWM controller provides high efficiency, excellent transient response, and high DC output accuracy for stepping down high voltage batteries to generate low voltage CPU core, I/O, and chipset RAM. <p align="justify">The RT6543A/B supports on chip voltage programming function between 0V and 1.8V by controlling VID1/VID0 inputs. </p><p align="justify">Compared with conventional current-mode PWMs, the RT6543A/B achieves high efficiency without any current sensing resistors. Furthermore, the RT6543A/B has ability to drive synchronous rectifier MOSFETs and enters diode emulation mode at light load condition that also save lots of power consumption. Besides, the RT6543A/B equips with UVLO, OVP, UVP, OTP and current limit protection. All above functions are integrated in a WQFN-20L-3x3 package.</p>
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<li class="mv5"> A High Efficiency Step-Down DC-DC Controller<br /></li><li class="mv5"> Built-in 1% Reference Voltage<br /></li><li class="mv5"> 2-Bit Programmable Output Voltage with Integrated<br /></li><li class="mv5"> Adjustable Switching Frequency<br /></li><li class="mv5"> Input Voltage Range : 3V to 24V<br /></li><li class="mv5"> Internal Soft-Start to Reduce Inrush Current<br /></li><li class="mv5"> Capability of Driving Large Synchronous Rectifier MOSFETs<br /></li><li class="mv5"> Power Good Indicator<br /></li><li class="mv5"> Cycle-by-Cycle Current Limit<br /></li><li class="mv5"> Over-/Under-Voltage Protection<br /></li><li class="mv5"> Thermal Shutdown<br /></li><li class="mv5"> RT6543A : Slew Down Mode as VID Change<br /></li><li class="mv5"> RT6543B : Decay Down Mode as VID Change</li>
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<li class="mv5"> Notebook Computers<br /></li><li class="mv5"> CPU/GPU Core Supply<br /></li><li class="mv5"> Chipset/RAM Supply<br /></li><li class="mv5"> Generic DC-DC Power Regulator</li>
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