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The RT7241A provides a complete power supply for DDR3/DDR3L/LPDDR3/DDR4 memory systems. It integrates an Advanced Constant On-Time (ACOT<sup>TM</sup>) mode synchronous Buck converter with a 1.5A sink/source tracking linear regulator. The PWM converter provides low quiescent supply current, high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate low-voltage chipset RAM supplies in notebook computers. The ACOT<sup>TM</sup> control scheme handles wide input/output voltage ratios with ease and provides a very fast response to load transients with no external compensators. The 1.5A sink/source VTT LDO maintains fast transient response only requiring 10μF ceramic output capacitance. The RT7241A supports all of the sleep state controls placing VTT at high-Z in S3 and discharging VDDQ and VTT in S4/S5. The RT7241A provides complete protection features including OCP, OVP, UVP, and thermal shutdown. The RT7241A is available in the UQFN-18L 3x4 package.
RT7241A Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>DDR3/DDR3L/LPDDR3/DDR4 Complete Solution </li><li>PWM Converter (VDDQ) <ul class="lv2"> <li></li><li>100μA Low Quiescent Supply Current at S3 Mode </li><li>ACOT<sup>TM</sup> Mode Performs Fast Transient Response </li><li>Support MLCC Output Capacitors </li><li>Integrated Low On-Resistance MOSFETs </li></ul> </li><li>17mΩ of High-Side MOSFET </li><li>4.5mΩ of Low-Side MOSFET <ul class="lv2"> <li></li><li>Adjustable from 0.6V to 1.5V Output Range for 1.5V (DDR3), 1.35V (DDR3L), 1.2V (LPDDR3) and 1.2V (DDR4) </li><li>4.5V to 23V Battery Input Range </li><li>500kHz Switching Frequency </li><li>Resistor Adjustable Valley Current Limit </li><li>Over-/Under-Voltage Protection </li><li>Internal Voltage Ramp Soft-Start </li><li>Power Good Indicator </li></ul> </li><li>1.5A LDO (VTT) <ul class="lv2"> <li></li><li>Capable to Sink and Source up to 1.5A </li><li>LDO Input Available to Optimize Power Losses </li><li>Require Only 10μF Ceramic Output Capacitor </li><li>Integrated Divider Tracks 1/2 VDDQ for VTT </li><li>Accuracy ±20mV for VTT </li><li>Support High-Z in S3 and Soft-Off in S4/S5 </li></ul> </li><li>Tracking Mode Discharge Control </li><li>Thermal Capable Flip-chip (FC) Package for 12A VDDQ Converter and 1.5A VTT LDO </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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RT7241A Ordering Information
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<div class="spec-list"><ul class="lv1"><li>DDR3/DDR3L/LPDDR3/DDR4 Memory Power Supplies </li><li>Notebook computers </li></ul></div>
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