APW7055
Advanced PWM and Linear Power Controller
Features
General Description
The APW7055 provides the power control and protec-
tions 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.
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Operates from 5V input supply
2 Regulated Voltage are provided
− Standard Buck Switching Power for VMEM
(2.5V)
− Linear Controller with Source-Sink Regula
tion for VTT(1.25V)
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Simple Single-Loop Control Design
− Voltage-Mode PWM Control
Excellent Output Voltage Regulation
− VMEM Output : VMEM ±1.5% Over Tem-per
ature
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 shut-
down the upper MOSFET and disable all output volt-
age . The PWM controller’s over-current function moni-
tors the output current by sensing the voltage drop
across the upper MOSFET‘s rDS(ON) , eliminating the
need for a current sensing resistor .
− VTT Output : 1/2 VIN ±25mV Over Tempera-
ture
•
Fast Transient Response
− Built-in Feedback Compensation
− Full 0% to 100% Duty Ratio
Over-Voltage and Over-Current Fault Monitors
Constant Frequency Operation(200kHz)
16 pins, SSOP Package
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Pin Description
VCC
SS
BOOT
UGATE
PHASE
PGND
MEM1
MEM0
OCSET
VSEN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Applications
SD
SOURCE
SINK
FB
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•
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M/B DDR Power Regulation
AGP/PCI Graphics Power Regulation
SSTL-2 Termination
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.
1
www.anpec.com.tw
Rev.A.1 - Dec., 2001