General Description

The RT8223P 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 RT8223P 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 RT8223P is available in a WQFN-24L 4x4 package.

特性 Features

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

nternal Soft-Start and Soft-Discharge

High Efficiency up to 97

5mW Quiescent Power Dissipation

Thermal Shutdown

RoHS Compliant and Halogen Free