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The RT8206L/M dual step-down, Switch-Mode Power-Supply (SMPS) controller generates logic-supply voltages in battery-powered systems. The RT8206L/M includes two Pulse-Width Modulation (PWM) controllers fixed at 5V/3.3V or adjustable from 2V to 5.5V. An optional external charge pump can be monitored through SECFB (RT8206L). This device also features a linear regulator providing a fixed 5V output. The linear regulator provides up to 70mA output current with automatic linear regulator bootstrapping to the BYP input. The RT8206L/M includes on-board power-up sequencing, the power good outputs, internal soft-start, and internal soft-discharge output that prevents negative voltages on shutdown.<br />A constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load transients while maintaining a relatively constant switching frequency. The unique ultrasonic mode maintains the switching frequency above 25kHz, which eliminates noise in audio applications. Other features include Diode-Emulation Mode (DEM), which maximizes efficiency in light-load applications, and fixed frequency PWM mode, which reduces RF interference in sensitive application.<br />The RT8206L/M is available in a WQFN-32L 5x5 package.</div>
RT8206L/RT8206M Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Wide Input Voltage Range 6V to 25V </li><li>Dual Fixed 5V/3.3V Outputs or Adjustable from 2V to 5.5V<font size="4">,</font> 1.5% Accuracy </li><li>Secondary Feedback Input Maintains Charge Pump Voltage (RT8206L) </li><li>Independent Enable and Power Good </li><li>5V Fixed LDO Output : 70mA </li><li>2V Reference Voltage ±1% : 50mA </li><li>Constant ON-Time Control with 100ns Load Step Response </li><li>Frequency Selectable via TON Setting </li><li>R<sub>DS(ON)</sub> Current Sensing and Programmable Current Limit </li><li>4700ppm/°C R<sub>DS(ON)</sub> Current Sensing </li><li>Selectable PWM<font size="4">,</font> DEM or Ultrasonic Mode </li><li>Internal Soft-Start with Current Limiting and Soft-Discharge </li><li>High Efficiency Up to 97% </li><li>5mW Quiescent Power Dissipation </li><li>Thermal Shutdown </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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RT8206L/RT8206M Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Notebook and Sub-Notebook Computers </li><li>3-Cell and 4-Cell Li+ Battery-Powered Devices </li></ul></div>
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