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The RT8234 is a cost effective synchronous buck controller with an integrated 3A linear regulator. The PWM controller provides high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high voltage batteries to generate low voltage supplies in notebook computers.<br />The constant on-time PWM control scheme handles wide input/output voltage ratios with ease and provides "instant-on" response to load transients while maintaining a relatively constant switching frequency. The Ultra Sonic Mode (USM) setting maintains the switching frequency above 30kHz, which eliminates noise in audio applications.<br />The RT8234 is intended for CPU core, chipset, DRAM, or other low voltage supplies as low as 0.75V at a reduced cost without the need for a current sense resistor.<br />The 3A LDO regulator maintains fast transient response, only requiring a 20μF ceramic output capacitor. In addition, the LDO supply input is provided by an external power source to significantly reduce the total power loss. The RT8234 is available in a WQFN-16L 3x3 package.</div>
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<div class="spec-list"><ul class="lv1"><li>PWM Controller<font size="1"> <ul class="lv2"> <li></li><li></font>Wide Input Voltage Range : 4.5V to 26V<font size="1"> </li><li></font>Adjustable Output Voltage Range : 0. 75V to 3.3V<font size="1"> </li><li></font>Resistor Programmable Current Limit<font size="1"> </li><li></font>Quick Load Step Response within 100ns<font size="1"> </li><li></font>1% V<sub>OUT</sub> Accuracy Over Line and Load<font size="1"> </li><li></font>Resistor Programmable Frequency<font size="1"> </li><li></font>Over/Under Voltage Protection<font size="1"> </li><li></font>Linear Current Limit Soft-Start<font size="1"> </li><li></font>Drives Large Synchronous Rectifier FETs<font size="1"> </li><li></font>Power Good Indicator </li></ul> </li><li>LDO Regulator<font size="1"> <ul class="lv2"> <li></li><li></font>Output Current Up to 3A<font size="1"> </li><li></font>1% Accuracy Over Line and Load<font size="1"> </li><li></font>Adjustable Output Voltage Down to 0.75V<font size="1"> </li><li></font>Independent Enable and Power Good Indicator </li></ul> </li><li>RoHS Compliant and 100% Halogen Free </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Notebook Computers </li><li>CPU Core Supply </li><li>Chipset/RAM Supply as Low as 0.75V </li></ul></div>
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