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The RT6201A/B is a synchronous step-down DC/DC converter with Advanced Constant On-Time (ACOT<sup>®</sup>) mode control. It achieves high power density to deliver up to 4A output current from a 4.5V to 18V input supply. The proprietary ACOT<sup>®</sup> mode offers an optimal transient response over a wide range of loads and all kinds of ceramic capacitors, which allows the device to adopt very low ESR output capacitor for ensuring performance stabilization. In addition, RT6201A/B keeps an excellent constant switching frequency under line and load variation and the integrated synchronous power switches with the ACOT<sup>®</sup> mode operation provides high efficiency in whole output current load range. Cycle-by-cycle current limit provides an accurate protection by a valley detection of low side MOSFET and external soft-start setting eliminates input current surge during startup. Protection functions include thermal shutdown for RT6201A/B. The RT6201A/B are available in the SOP-8 (Exposed Pad) package.</p>
RT6201A/RT6201B Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>ACOT<sup>®</sup> Mode Enables Fast Transient Response </li><li>4.5V to 18V Input Voltage Range </li><li>4A Output Current </li><li>50mΩ Internal Low Side N-MOSFET </li><li>Advanced Constant On-Time Control </li><li>Support All Ceramic Capacitors </li><li>Up to 95% Efficiency </li><li>650kHz Switching Frequency at all Load Current (RT6201B) </li><li>Discontinuous Operating Mode at Light Load (RT6201A) </li><li>Adjustable Output Voltage from 0.765V to 8V </li><li>Adjustable Soft-Start </li><li>Cycle-by-Cycle Current Limit </li><li>Input Under Voltage Lockout </li><li>Thermal Shutdown </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Industrial and Commercial Low Power Systems </li><li>Computer Peripherals </li><li>LCD Monitors and TVs </li><li>Green Electronics/Appliances </li><li>Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs </li></ul></div>
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