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The RT9232B is a single-phase synchronous buck PWM DC/DC converter controller designed to drive two N-MOSFETs. It provides a highly accurate, programmable output voltage precisely regulated to low voltage requirement with an internal 0.8V ± 1% reference. The RT9232B uses an external compensated, single feedback loop voltage mode PWM control for fast transient response. An<strong> </strong>oscillator with Programmable frequency (50kHz to 800kHz)<strong> </strong>reduces the external inductor and capacitor component size for saving PCB board area. </p>The RT9232B provides fast transient response to satisfy high current output applications (up to 25A) while minimizing external components. It is suitable for high-performance graphic processors, DDR and VTT power. </p>The RT9232B integrates complete protect functions such as Soft Start, Output Enable, UVLO(under-voltage lockout) and OCP into a small 14-pin package.</p>
RT9232B Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Single IC Supply Voltage : 12V </li><li>Single phase DC/DC Buck Converter with <ul class="lv2"> <li></li><li>High Output Current (up to 25A) </li><li>Low Output Voltage (down to 0.8V) </li><li>High Input Voltage (up to 12V) </li></ul> </li><li>Operate from 12V, 5V or 3.3V Input </li><li>0.8V ± 1% Internal Reference </li><li>Adaptive Non-Overlapping Gate Drivers </li><li>Integrated High-Current, HV Gate Drivers </li><li>External Programmable Soft Start </li><li>External Programmable Frequency(Range : 50kHz to 800kHz, 200kHz Free Run) </li><li>Provide Over Current Protection by Sensing MOSFET R<sub>DS(ON)</sub> </li><li>On/Off Control by Enable Pin </li><li>Drives Two N-MOSFET </li><li>Full 0 to 100% Duty Cycle </li><li>Fast Transient Response </li><li>Voltage Mode PWM Control with External Feedback Loop Compensation </li><li>RoHS Compliant and 100% Lead (Pb)-Free </li></ul></div>
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RT9232B Ordering Information
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<div class="spec-list"><ul class="lv1"><li>System (Graphic, MB) with 12V Power. </li><li>Graphic Cards (AGP 8X, 4X, PCI Express*16) : <ul class="lv2"> <li></li><li>High-Current for High-Performance Graphic Processors (GPU, VPU) </li><li>Middle Current for High-Performance Graphic Memory Power (DDR, DDR II) </li><li>Low Current with Sink Capacity for High-Performance Graphic Memory Power (DDR/VTT) </li></ul> </li><li><strong></strong>3.3V to 12V Input DC/DC Regulators </li><li><strong></strong>Low Voltage Distributed Power Supplies </li></ul></div>
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