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The RT8237M PWM controller provides high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate low voltage CPU core, I/O, and chipset RAM supplies in notebook computers.The constant on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency.The RT8237M achieves high efficiency at a reduced cost by eliminating the current sense resistor found in traditional current mode PWMs. Its efficiency is further enhanced by the ability to drive very large synchronous rectifier MOSFETs and to enter diode emulation mode under light load conditions. The buck conversion allows this device to directly step down high-voltage batteries at the highest possible efficiency. The preset frequency selections simplify the design process for new designs. The RT8237M is intended for CPU cores, chipsets, DRAM, or other low voltage supplies down to 0.7V. The RT8237M is available in a WDFN-10L 3x3 package. The recommended ambient temperature range is from -40°C to 85°C and the junction temperature range is from -40°C to 125°C.
RT8237M Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Wide Input Voltage Range: 4.5V to 26V </li><li>Output Voltage Range: 0.7V to 3.3V </li><li>Built-in 0.5% 0.7V Reference Voltage </li><li>Quick Load-Step Response within 100ns </li><li>4700ppm/°C Current Source for Current Limit R<sub>DS(ON)</sub> </li><li>Adjustable Current Limit with Low-side MOSFET </li><li>Four Selectable Frequency Settings </li><li>Soft-Start Control </li><li>Drives Large Synchronous-Rectifier FETs </li><li>Integrated Boot Switch </li><li>Built-In OVP, OCP, and UVP </li><li>Over-Temperature Protection </li><li>Power-Good Indicator </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 Down to 0.7V </li><li>Generic DC-DC Power Regulator </li></ul></div>
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