RT8223P High Efficiency, Main Power Supply Controller for Notebook Computer
■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 2Vto 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 mainlining 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.
■Features
●Constant On-time Control with 400ns 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 R-DS(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
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High Efficiency, Main Power Supply Controller 、 dual step-down, switch-mode power supply controller |
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[ Notebook Computers ][ Sub-Notebook Computers ][ 3-Cell Li+ Battery-Powered Devices ][ 4-Cell Li+ Battery-Powered Devices ] |
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Datasheet |
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Please see the document for details |
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WQFN-24L;QFN |
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English Chinese Chinese and English Japanese |
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June 2011 |
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DS8223P-01 |
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732 KB |
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