鈥?/div>
3 Regulated Voltage are provided
General Description
The APW7015 integrates a PWM controller and Dual
linear controller, as well as the monitoring and pro-
tection functions into a single package, which pro-
vides three controlled power outputs with over-volt-
age and over-current protections. The PWM control-
ler regulates the DDR reference voltage with a syn-
chronous-rectified buck converter. The linear control-
ler regulates power for microprocessor core voltage
and Memory Voltage.
TTL Compatible 3-bit digital-to-analog converter
(DAC) that adjusts the output voltage from 1.3V
DC
to 1.65V
DC
in 0.05V steps is included in APW7015.
The precision reference and voltage-mode PWM
control provide 鹵2% static regulation. The linear
controller drives an external N-channel MOSFET to
provide adjustable voltage.
The APW7015 monitors all the output voltages, and
a single Power Good signal is issued when the PWM
Voltage is within 10% of the DAC setting and the
other output levels are above their under-voltage
thresholds. Additional built-in over-voltage protec-
tion for the PWM output uses the lower MOSFET to
prevent output voltages above 115% of the DAC
setting. The PWM over-current function monitors the
output current by using the voltage drop across the
upper MOSFET鈥檚 R
DS(ON)
,eliminating the need for a
current sensing resistor.
鈥?/div>
Switching Power for VTT(1.25V)
鈥?/div>
Linear1 Regulator for FBVDDQ(2.5V)
鈥?/div>
Linear2 Regulator for NVVDD(2.05V)
鈥?/div>
鈥?/div>
Simple Single-Loop Control Design
鈥?/div>
Voltage-Mode PWM Control
Excellent Output Voltage Regulation
鈥?/div>
PWM Output:
鹵
2% Full Temperature
鈥?/div>
Linear Output:
鹵
3% Full Temperature
鈥?/div>
Fast Transient Response
鈥?/div>
High-Bandwidth Error Amplifier
鈥?/div>
Full 0% to 100% Duty Ratio
鈥?/div>
TTL-Compatible 3-Bit Digital-to-Analog Output
Voltage Selection
鈥?/div>
0.05V Steps from 1.3V
DC
to 1.65V
DC
鈥?/div>
Power-Good Output Voltage Monitor
鈥?/div>
Over-Voltage and Over-Current Fault
鈥?/div>
Monitors Small Converter Size
鈥?/div>
Constant Frequency Operation(200kHz)
鈥?/div>
Programmable Oscillator from 50kHz to
1MHz
Pin Description
VCC
DRIVE2
NC
NC
VID2
VID1
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
UGATE
PHASE
LGATE
PGND
OCSET
VSEN1
FB
COMP
VSEN3
DRIVE3
GND
VAUX
鈥?/div>
Reduce External Component Count
Applications
鈥?/div>
Motherboard Power Regulation for Computers
VID0
PGOOD
VSEN2
SS
FAULT
NC
鈥?/div>
Low-Voltage Distributed Power Supplies
鈥?/div>
VGA Card Power Regulation
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
錚?/div>
ANPEC Electronics Corp.
Rev. P.1 - Mar., 2001
1
www.anpec.com.tw
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