RT8223L

RT8223L/M High Efficiency, Main Power Supply Controller for Notebook Computer General Description The RT8223L/M is a dual step-down, switch-mode power supply controller generating logic-supply voltages in battery-powered systems. It includes two Pulse Width Modulation (PWM) controllers adjustable from 2V to 5.5V, and also features fixed 5V/3.3V linear regulators. Each linear regulator provides up to 100mA output current with automatic linear regulator bootstrapping to the PWM outputs. The RT8223L/M includes on-board power up sequencing, a power good output, internal soft-start, and soft-discharge output that prevents negative voltage during shutdown. The constant on-time PWM scheme can operate without sense resistors and provide 100ns load transient response while maintaining nearly constant switching frequency. To eliminate noise in audio applications, an ultrasonic mode is included, which maintains the switching frequency above 25kHz. Moreover, the diode-emulation mode maximizes efficiency for light load applications. The RT8223L/M is available in a WQFN-24L 4x4 package. Features z z z z z z z z z z z z z z Constant On-time Control with 100ns Load Step Response Wide Input Voltage Range : 6V to 25V Dual Adjustable Outputs from 2V to 5.5V Fixed 3.3V and 5V LDO Output : 100mA 2V Reference Voltage Frequency Selectable via TONSEL Setting 4700ppm/°C RDS(ON) Current Sensing Programmable Current Limit Combined with Enable Control Selectable PWM, DEM, or Ultrasonic Mode Internal...