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The RT6254 is a high-performance, synchronous step-down DC-DC converter that can deliver up to 4A output current from a 4.5V to 18V input supply. The device integrates low R<sub>DS(ON)</sub> power MOSFETs, accurate 0.6V reference and an integrated diode of bootstrap circuit to offer a very compact solution.<br />The RT6254 adopts Advanced Constant On-Time (ACOT<sup>®</sup>) control architecture that provides ultrafast transient response and further reduces the external-component count. In steady states, the ACOT<sup>®</sup> operates in nearly constant switching frequency over line, load and output voltage ranges and makes the EMI filter design easier.<br />The device offers Independent enable control input pin and power good indicator (TSOT-23-8 only) for easily sequence control. To control the inrush current during the startup, the device provides a fixed 1.5ms soft-start up. Fully protection features are also integrated in the device including the cycle-by-cycle current limit control, UVP, input UVLO and OTP. <br />The RT6254 is available in the TSOT-23-6 (FC) and TSOT-23-8 (FC) package.</p>
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<div class="spec-list"><ul class="lv1"><li>4.5V to 18V Input Voltage Range </li><li>4A Output Current </li><li>Constant-on-Time Mode to Enables Fast Transient Response </li><li>Low Output Ripple and Allows Ceramic Output Capacitor </li><li>500kHz Switching Frequency </li><li>High Efficient Internal Power MOSFET Switch Optimized for Lower Duty Cycle Applications </li><li>Integrated 48mΩ/25mΩ MOSFETs </li><li>Internal Soft-Start (1.5ms typ.) </li><li>Built-In UVP/OTP </li><li>Power Good Indicator (90%) </li><li>Input Under Voltage Lockout </li><li>TSOT-23-6 (FC) and TSOT-23-8 (FC) Packages </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Set Top Box </li><li>Portable TV </li><li>Access Point Router </li><li>DSL Modem </li><li>LCD TV </li></ul></div>
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