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RT9238CS Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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RT9238CS Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 24 page  Preliminary RT9238 DS9238-01 July 2001 www.richtek-ic.com.tw 1 VRM8.5 PWM and Triple Linear Power System Controller General Description The RT9238 is a 4-in-one power controller optimized for high-performance microprocessor and computer applications. The IC integrates a PWM controller, triple linear controller as well as monitoring and protection functions into a 28-pin SOP package. The PWM controller regulates the microprocessor core voltage with a synchronous buck converter. The first linear controller supplies the computer system’s AGTL+ 1.2V bus power. The second linear controller provides power for the 1.5V AGP bus and the 3rd linear controller provides 1.8V power for the chipset core voltage and/or cache memory circuits. The RT9238 features an Intel VRM8.5 compatible, TTL 5-bit programmable DAC that adjusts the core voltage from 1.090V to 1.865V in 25mV steps. The 5- bit DAC has a typical ±1% tolerance. The linear regulators provide fixed output voltages of 1.2V (VOUT2), 1.5V (VOUT3) and 1.8V (VOUT4) or user- adjustable with an internal 1.265V reference. All the three linear regulators drive external N-MOSFET or NPNs bipolar for the pass transistor. The RT9238 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 MOSFET’s RDS(ON), which eliminates the need for a current sensing resistor. Applications Motherboard Power Regulation for Computers Features 4-in-one Regulated Voltages for Microprocessor Core, AGTL+ Bus, AGP Bus Power, and North/South Bridge Core Compatible with ISL6524 Power-good Output Voltage Monitor Switching section VRM8.5 TTL-Compatible 5-bit DAC Programmable from 1.090V to 1.865V ±±±±1% DAC Accuracy Fast Transient Response VRM 8.5 Voltage Droop Tuning Uses MOSFET R DS(ON) Fixed 200KHz Switching Frequency Adaptive Non-overlapping Gate Driver Over-current Monitor Uses MOSFET RDS(ON) Over-voltage Protection Uses Lower MOSFET Linear Section Fixed or User-adjustable Linear Regulator Output Voltage MOSFET and NPN Driving Capability Ultra Fast Response Speed Under-voltage Protection Internal Thermal Shutdown Pin Configurations Part Number Pin Configurations RT9238CS (Plastic SOP-28) 1 2 3 4 5 6 7 8 9 10 11 12 17 18 19 20 21 22 23 24 25 26 27 28 13 14 16 15 FIX VID3 VID2 VID1 VID0 VID25 PGOOD VTTPG FAULT/VID4 DRIVE2 SS24 VSEN2 SS13 VSEN4 LGATE1 VCC UGATE1 PHASE1 PGND OCSET1 FB1 VDAC VSEN3 DRIVE3 GND ICOMP VAUX DRIVE4 |
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