APW7046 Datasheet, PDF (1/12 Pages) Anpec Electronics Coropration – Dual Advanced PWM and Source-Sink Linear Controller

APW7046
Dual Advanced PWM and Source-Sink Linear Controller
Features
General Description
• 3 Regulated Voltages are provided
− Standard Buck Converter for VCORE
(1.15~1.50V)
− Standard Buck Converter for VMEM
(2.40~3.15V)
−Linear Controller with SOURCE-SINK Regul-
ation for VTT(1.25V)
• Simple Single-Loop Control Design
− Voltage-Mode PWM Control
• Excellent Output Voltage Regulation
− VCORE Output : ±1% Over Temperature
− VMEM Output : ±1.5% Over Temperature
− VTT Output : 1/2 VIN ±25mV Over Tempera-
ture 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
Applications
• M/B DDR Power Regulation
• AGP/PCI Graphics Power Regulation
• SSTL-2 Termination
The APW7046 provides the power controls and protec-
tions for three output voltages on AGP/PCI Graphic Card
applications. It 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) supplies the VCORE(1.5V) for the GPU
with a standard buck converter. The other standard buck
converter (PWM2) regulates the VMEM(2.5V) for the pow-
er 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. It reg-
ulates 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
, eliminating the need for a
DS(ON)
current sensing resistor.
Pin Description
VCC 1
UGATE 1 2
PHASE1 3
SS 4
SD 5
SO URCE 6
SINK 7
FB 8
VIN 9
OCSET1 10
VSE N1 11
GND 12
24 BOOT
23 UGATE 2
22 PHASE2
21 PG ND
20 MEM2
19 MEM1
18 MEM0
17 CORE2
16 CORE1
15 CORE0
14 OCSET2
13 VSE N2
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.
1
Rev.A.2 - Mar., 2002
www.anpec.com.tw