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The RT8122 is a high efficiency dual-channel synchronous Buck PWM controller with integrated MOSFET drivers and two LDOs. The controller features Green Voltage Mode (GVM<sup>TM</sup>) control, which is specifically designed to improve efficiency at light load condition. At light load condition, the RT8122 is pin configurable to automatically operate in diode emulation mode with constant on-time PFM to reduce switching frequency so as to improve conversion efficiency. As the load current increases, the RT8122 leaves the diode emulation mode and operates in Continuous Conduction Mode (CCM) with fixed-frequency, 180° out of phase interleaved PWM to reduce input capacitance. The RT8122 supports 4.5V to 26V input voltage range and has integrated 5V LDO which powers the integrated 5V MOSFET gate drivers as well as the controller. When channel 1 Buck regulator output voltage is set to 5V, the controller supply voltage automatically switches between the Buck regulator output and the integrated 5V LDO. The RT8122 supports enable/disable function for each channel and also features external soft-start, adjustable switching frequency and power good indication. This device utilizes lossless inductor DCR current sensing for over current protection. Other protections include over voltage, under voltage, thermal shutdown and under voltage lockout. The RT8122 is available in a WQFN-28L 4x4 package.</p>
RT8122 Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Green Voltage Mode (GVM<sup>TM</sup>) Control </li><li>High Light Load Efficiency </li><li>Audio-Skip Mode (ASM) at Light Load </li><li>Pin Configurable CCM/DEM Operation </li><li>180° Interleaving PWM in CCM Operation </li><li>Support 4.5V to 26V Input Voltage Range </li><li>Integrated 5V MOSFET Driver and Bootstrap Circuit </li><li>Integrated 5V and 12V LDO </li><li>Enable Control for Each Channel </li><li>External/Internal Soft-Start </li><li>Adjustable LGATE PWM Frequency Setting (LGFS) </li><li>Automatic Switchable 5V Regulator </li><li>Power Good Indication </li><li>VIN Feed-Forward in Control Loop </li><li>Lossless DCR Current Sensing </li><li>OVP, UVP, OCP, Thermal Shutdown and UVLO </li><li>Small 28-Lead WQFN Package </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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RT8122 Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Motherboard, Server, Graphic Card<strong></strong> </li><li><strong> </strong>System Power Supplies<strong></strong> </li><li><strong> </strong>Power Module<p></p> </li></ul></div>
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