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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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  • A High Efficiency Step-Down DC-DC Controller
  • Built-in 1% Reference Voltage
  • 2-Bit Programmable Output Voltage with Integrated
  • Adjustable Switching Frequency
  • Input Voltage Range : 3V to 24V
  • Internal Soft-Start to Reduce Inrush Current
  • Capability of Driving Large Synchronous Rectifier MOSFETs
  • Power Good Indicator
  • Cycle-by-Cycle Current Limit
  • Over-/Under-Voltage Protection
  • Thermal Shutdown
  • RT6543A : Slew Down Mode as VID Change
  • RT6543B : Decay Down Mode as VID Change
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Notebook Computers<br />CPU/GPU Core Supply<br />Chipset/RAM Supply<br />Generic DC-DC Power Regulator
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