APW7055 Datasheet | Anpec Electronics Coropration

Features - - Operates from 5V input supply 2 Regulated Voltage are provided General Description The APW7055 provides the power control and protections for two output voltages on M/B DDR applications. It integrates one PWM controller , one source-sink linear controller(LC) for DDR source-sink purpose, as well as the monitor and protection functions into a single package. The PWM controller supplies the VMEM(2.5V) with a standard buck converter. The source-sink linear controller regulates VTT(1.25V) power for DDR Termination. Additional built-in over-voltage protection (OVP) will be started when the VMEM output is above 115% of the internal DAC setting(VDAC) . OVP function will shutdown the upper MOSFET and disable all output voltage . The PWM controller’s over-current function monitors the output current by sensing the voltage drop across the upper MOSFET‘s r DS(ON) , eliminating the need for a current sensing resistor . - Standard Buck Switching Power for VMEM .. (2.5V) - Linear Controller with Source-Sink Regula tion for VTT(1.25V) Simple Single-Loop Control Design - - - Voltage-Mode PWM Control Excellent Output Voltage Regulation - VMEM Output : VMEM ±1.5% Over Tem-per ature - VTT Output : 1/2 VIN ±25m V Over Temperature - Fast Transient Response - Built-in Feedback pensation - Full 0% to 100% Duty Ratio - - - Over-Voltage and Over-Current Fault Monitors Constant Frequency Operation(200k Hz) 16 pins, SSOP Package Pin Description VCC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 BOOT UGATE PHASE PGND MEM1 MEM0 OCSET VSEN Applications - - - M/B DDR Power Regulation AGP/PCI Graphics Power Regulation SSTL-2 Termination SS SD SOURCE SINK FB VIN GND ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. Copyright  ANPEC Electronics Corp. Rev.A.1 - Dec., 2001 1 .anpec..tw Ordering Information APW 7055 L e...