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CM8501AGIS Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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CM8501AGIS Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
6 / 10 page CM8501/A 1.5A BUS TERMINATOR FUNCTIONAL DESCRIPTION The CM8501/A is a switching regulator that is capable of sinking and sourcing 1.5A of current without an external heat sink. CM8501/A uses a standard surface mount PTSSOP and PSOP package with bottom metal exposed and the heat can be piped through the bottom of the device and onto the PCB. The CM8501/A integrates power MOSFETs that are capable of source and sink 1.5A of current while maintaining excellent voltage regulation. The output voltage can be regulated within 3% or less by using the external feedback. Separate voltage supply inputs have been added to fit applications with various power supplies for the databus and power buses. OUPUTS The output voltage pins (VL) are tied to the databus, address, or clock lines via an external inductor. Output voltage is determined by the VCCQ or VIN/2 inputs for CM8501 and is determined by the VCCQ only for CM8501A. INPUTS The input voltage pins (VCCQ & VIN/2 of CM8501 or VCCQ of CM8501A) determine the output voltages (VL). At CM8501, when the VIN/2 pin is open, the output voltage is 50% of the VCCQ input. If a specific voltage is forced at the VIN/2 pin, the output voltage follows the voltage at the VIN/2 pin. At CM8501A, the output voltage is always 50% of the VCCQ input. VCCQ is suggested to connect to VCCQ of memory module for better tracking with memory VCCQ. OTHER SUPPLY VOLTAGES Several inputs are provided for the supply voltages: PVDD and VCCA The PVDD provide the power supply to the power MOSFETs. VCCA provide the voltage supply to the logic section and internal error amplifiers of CM8501/A. FEEDBACK The VFB pin is an input that can be used for closed loop compensation. This input is derived from the voltage output. AGSEN pin is a contact node of internal resistor divider for remote sense (CM8501). 2005/02/02 Rev. 1.2 Champion Microelectronic Corporation Page 6 |
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