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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-PWMTM "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.
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  • No Current Sense Resistor Needed
  • 1.5% Output Voltage Accuracy
  • 3.3V and 5V 100mA Bootstrapped Linear Regulators
  • Internal Soft-Start and Soft-Shutdown Output Discharge
  • Mach-PWM with 100ns Load Step Response
  • 3.3V and 5V Fixed or Adjustable Outputs
  • 7V to 24V Input Voltage Range
  • Ultrasonic Mode Operation 25kHz (min.)
  • Power Good (PGOOD) Signal
  • Over Voltage Protection
  • Under Voltage Protection
  • Over Temperature Protection
  • RoHS Compliant and 100% Lead (Pb)-Free
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Notebook and Subnotebook Computers<br />PDAs and Mobile Communication Devices<br />3- and 4-Cell Li+ Battery-Powered Devices
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