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RT9228 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9228 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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RT9228 DS9228-03 July 2001 www.richtek.com 1 Advanced PWM and Dual Linear Power Controller General Description The RT9228 is a 3-in-one power controller optimized for high-performance microprocessor and computer applications. The IC integrates a synchronous buck PWM controller, a linear regulator, and a linear controller as well as monitoring and protection functions into a 24-pin SOP package. The PWM controller regulates the microprocessor core voltage. The linear regulator provides power for the clock driver circuit and the linear controller regulates power for the GTL bus. The RT9228 features an Intel-compatible, TTL 5-bit programmable DAC that adjusts the core voltage from 2.1V to 3.5V in 0.1V increments and from 1.3V to 2.05V in 0.05V steps. The 5-bit DAC has a typical ±1% tolerance. The linear regulator uses an internal drive device to provide 2.5V ±2.5% output voltage. The linear controller drives an external N-channel MOSFET or a low cost NPN bipolar transistor to provide 1.5V ±2.5%. The RT9228 monitors all the output voltages. A Power-good signal is issued when the core voltage is within ±10% of the DAC setting and the other levels are above their under-voltage levels. Additional build- in over-voltage protection for the core output uses the lower MOSFET to prevent output voltage above 115% of the DAC setting. The PWM over-current function monitors the output current using the voltage drop across the upper MOSFET’s RDS(ON), which eliminates the need for a current sensing resistor. Ordering Information RT9228 Features 3-in-one Regulated Voltages for Microprocessor Core, Clock, and GTL Compatible with HIP6018B Power-good Output Voltage Monitor Switching section 5-bit DAC Programmable from 1.3V to 3.5V ±1% DAC Accuracy Fast Transient Response Full 0% to 100% Duty Cycle Driver Fixed 200kHz Switching Frequency Adaptive Non-overlapping Gate Driver Over-current Monitor Uses MOSFET RDS(ON) Over-voltage Protection Uses Lower MOSFET Linear Section User-adjustable Linear Regulator Output Voltage MOSFET or NPN Driving Capability Ultra Fast Response Speed Under-voltage Protection Internal Thermal Shutdown Applications Full Motherboard Power Regulation for Computer Low-voltage Distribution Power Supplies Pin Configurations Part Number Pin Configurations RT9228CS (Plastic SOP-24) TOP VIEW Operating temperature range C: Commercial standard Package type S : SOP-24 1 2 3 4 5 6 7 8 9 10 VID4 VID3 VID2 VID1 VID0 PGOOD FAULT SS NC UGATE1 PHASE1 LGATE1 PGND OCSET1 VSEN1 FB1 NC FB3 GATE3 VCC VIN2 FB2 GND VOT2 11 12 13 14 15 16 17 18 19 20 21 22 23 24 |
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