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The RT8223A/B dual step-down, switch-mode power-supply controller generates logic-supply voltages in battery-powered systems. The RT8223A/B includes two pulse-width modulation (PWM) controllers fixed at 5V/3.3V or adjustable from 2V to 5.5V. This device also features 2 linear regulators providing fixed 5V and 3.3V outputs. The linear regulator each provides up to 70mA output current with automatic linear-regulator bootstrapping to the PWM outputs. The RT8223A/B includes on-board power-up sequencing, the power good output, 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 resistor 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</div>
RT8223A/RT8223B 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<span style="font-size: 18px;">,</span> 1.5% Accuracy </li><li>Fixed 3.3V and 5V LDO Output : 70mA </li><li>2V Reference Voltage±1% : 50μA </li><li>Constant ON-Time Control with 100ns Load Step Response </li><li>Frequency Selectable via TONSEL Setting </li><li>R<sub>DS(ON)</sub> Current Sensing and Programmable Current Limit combined with Enable Control </li><li>Selectable PWM<span style="font-size: 18px;">,</span> DEM<span style="font-size: 18px;">,</span> or Ultrasonic Mode </li><li>Internal Soft-Start 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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RT8223A/RT8223B 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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