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<p align="justify">The RT8203 dual step-down, Switch Mode Power Supply (SMPS) controllers generate logic-supply voltages in battery-powered systems. The RT8203 include two pulse-width modulation (PWM) controllers, adjustable from 2V to 5.5V or fixed at 5V and 3.3V. These devices feature two linear regulators providing 5V and 3.3V always-on outputs. Each linear regulator provides up to 100mA output current with automatic linear regulator bootstrapping to the main SMPS outputs. The RT8203 include on-board power-up sequencing, a power good (PGOOD) output, internal soft-start, and soft-shutdown output discharge that prevents negative voltages on shutdown. RichTek's proprietary Mach-PWM<sup>TM</sup> "instant-on" response, 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, which maximizes efficiency in light-load applications, and fixed-frequency PWM mode, which reduces RF interference in sensitive applications. The RT8203 provides a pin-selectable switching frequency, allowing either 200kHz/300kHz or 400kHz/500kHz operation of the 5V/3.3V SMPSs, respectively. The RT8203 is available in SSOP-28 package.</p>
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<li class="mv5"> No Current Sense Resistor Needed<br /></li><li class="mv5"> 1.5% Output Voltage Accuracy<br /></li><li class="mv5"> 3.3V and 5V 100mA Bootstrapped Linear Regulators<br /></li><li class="mv5"> Internal Soft-Start and Soft-Shutdown Output Discharge<br /></li><li class="mv5"> Mach-PWM with 100ns Load Step Response<br /></li><li class="mv5"> 3.3V and 5V Fixed or Adjustable Outputs<br /></li><li class="mv5"> 7V to 24V Input Voltage Range<br /></li><li class="mv5"> Ultrasonic Mode Operation 25kHz (min.)<br /></li><li class="mv5"> Power Good (PGOOD) Signal<br /></li><li class="mv5"> Over Voltage Protection<br /></li><li class="mv5"> Under Voltage Protection<br /></li><li class="mv5"> Over Temperature Protection<br /></li><li class="mv5"> RoHS Compliant and 100% Lead (Pb)-Free</li>
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<li class="mv5"> Notebook and Subnotebook Computers<br /></li><li class="mv5"> PDAs and Mobile Communication Devices<br /></li><li class="mv5"> 3- and 4-Cell Li+ Battery-Powered Devices</li>
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