APW7047

Features:

• 3 Regulated Voltages are provided− SYNC. Buck Converter for VCORE(1.15V~1.50V)− Standard Buck Converter for VMEM(2.40V~2.75V)−Linear Controller with SOURCE-SINK  Regulation for VTT(1.25V)
• Simple Single-Loop Control Design− Voltage-Mode PWM Control
• Excellent Output Voltage Regulation− VCORE Output : ±2% Over Temperature− VMEM Output : ±2% Over Temperature− VTT Output : 1/2 VIN ±25mV Over Temperature Min. VIN = 1.7V
• Fast Transient Response− Built-in Feedback Compensation− Full 0% to 100% Duty Ratio
• Over-Voltage and Over-Current Fault Monitor
• Constant Frequency Operation(200kHz)
• 24 pins, SOIC Package


Application

• M/B DDR Power Regulation
• AGP/PCI Graphics Power Regulation
• SSTL-2 Termination


Pinout




Specifications

Symbol	Parameter	Rating	Unit
Vcc	Supply Voltage	15	V
VI , VO	Input , Output or I/O Voltage	GND -0.3 V to VCC +0.3	V
TA	Operating Ambient Temperature Range	Range 0 to 70	°C
TJ	Junction Temperature Range	Range 0 to 125	°C
TSTG	Storage Temperature Range	Range -65 to +150	°C
TS	Soldering Temperature	300 ,10 seconds	°C

Description

The APW7047 provides the power controls and protections for three output voltages on AGP/PCI Graphic Card applications. APW7047 integrates two PWM controllers , one SOURCE-SINK linear controller, as well as the monitor and protection functions into a single package. One PWM converter (PWM1) regulates the VCORE(1.5V) for the GPU with a SYNC. buck converter. The other standard buck converter (PWM2) regulates the VMEM(2.5V) for the power of DDR memory. The SOURCE-SINK linear controller control two external MOSFETs to be a linear regulator
with the capability of sourcing and sinking current. APW7047 regulates the VTT (1.25V) power for DDR Termination voltage. Additional built-in over-voltage protection (OVP) will be started when the VCORE or VMEM output is above 115% of each DAC setting (VCORE and VMEM). OVP function will shutdown the all output voltages until re-powering on the IC. For each PWM converter, the over-current function monitors the output current by sensing the voltage drop across the MOSFET's r_DS(ON) , eliminating the need for a current sensing resistor.