APW7055 Datasheet, PDF (1/11 Pages) Anpec Electronics Coropration – Advanced PWM and Linear Power Controller

APW7055
Advanced PWM and Linear Power Controller
Features
General Description
• Operates from 5V input supply
The APW7055 provides the power control and protec-
• 2 Regulated Voltage are provided
tions for two output voltages on M/B DDR applications.
− Standard Buck Switching Power for VMEM
It integrates one PWM controller , one source-sink
linear controller(LC) for DDR source-sink purpose, as
(2.5V)
well as the monitor and protection functions into a
− Linear Controller with Source-Sink Regula
single package. The PWM controller supplies the
tion for VTT(1.25V)
• Simple Single-Loop Control Design
− Voltage-Mode PWM Control
VMEM(2.5V) with a standard buck converter. The
source-sink linear controller regulates VTT(1.25V)
power for DDR Termination.
• Excellent Output Voltage Regulation
Additional built-in over-voltage protection (OVP) will
− VMEM Output : V_MEM ±1.5% Over Tem-per be started when the VMEM output is above 115% of
ature
the internal DAC setting(V_DAC) . OVP function will shut-
− VTT Output : 1/2 VIN ±25mV Over Tempera- ^{down the upper MOSFET and disable all output volt-}
age . The PWM controller’s over-current function moni-
ture
tors the output current by sensing the voltage drop
• Fast Transient Response
across the upper MOSFET‘s r_DS(ON) , eliminating the
− Built-in Feedback Compensation
need for a current sensing resistor .
− Full 0% to 100% Duty Ratio
• Over-Voltage and Over-Current Fault Monitors
• Constant Frequency Operation(200kHz)
Pin Description
• 16 pins, SSOP Package
Applications
• M/B DDR Power Regulation
• AGP/PCI Graphics Power Regulation
• SSTL-2 Termination
VCC
1
SS
2
SD
3
SOURCE
4
SINK
5
FB
6
VIN
7
GND
8
16
BOOT
15
UGATE
14
PHASE
13
PGND
12
MEM1
11
MEM0
10
OCSET
9
VSEN
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.1 - Dec., 2001
www.anpec.com.tw