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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. The RT6543A/B supports on chip voltage programming function between 0V and 1.8V by controlling VID1/VID0 inputs. 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.
RT6543A/RT6543B Typical Circuit
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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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