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The RT6543 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. The RT6543 supports on chip voltage programming function between 0V and 1.8V by controlling VID1/VID0 inputs. Compared with conventional current-mode PWMs, the RT6543 achieves high efficiency without any current sensing resistors. Furthermore, the RT6543 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 RT6543 equips with UVLO, OVP, UVP, OTP and current limit protection. All above functions are integrated in a WQFN-20L-3x3 package.
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<div class="spec-list"><ul class="lv1"><li>A High Efficiency Step-Down DC-DC Controller </li><li>Built-in 1% Reference Voltage </li><li>2-Bit Programmable Output Voltage with Integrated </li><li>Adjustable Switching Frequency </li><li>Input Voltage Range : 3V to 24V </li><li>Internal Soft-Start to Reduce Inrush Current </li><li>Capability of Driving Large Synchronous Rectifier MOSFETs </li><li>Power Good Indicator </li><li>Cycle-by-Cycle Current Limit </li><li>Over-/Under-Voltage Protection </li><li>Thermal Shutdown </li><li>RT6543A : Slew Down Mode as VID Change </li><li>RT6543B : Decay Down Mode as VID Change </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Notebook Computers </li><li>CPU/GPU Core Supply </li><li>Chipset/RAM Supply </li><li>Generic DC-DC Power Regulator </li></ul></div>
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