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Notebook and Sub-Notebook Computers
Notebook and Sub-Notebook Computers
3-Cell and 4-Cell Li+ Battery-Powered Devices
Constant On-time Control with 100ns Load Step Response
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 Soft-Start and Soft-Discharge
High Efficiency up to 97%
5mW Quiescent Power Dissipation
Thermal Shutdown
RoHS Compliant and Halogen Free
High Efficiency, Main Power Supply Controller for Notebook Computer
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.
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