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Linear Regulator for FBVDDQ(2.5V)
General Description
The APW7026 Provides the power control and
protection for three output voltages in VGA Card
applications. It integrates two PWM controllers, one
linear controller as well as the monitoring and
protection functions into a single package. One PWM
controller (PWM1) regulates the termination voltage
VTT(1.25V) with a synchronous-rectified buck
converter. The second PWM controller (PWM2)
supplies the Core power NVVDD ( 2.05V ) with a
standard buck converter . The linear controller
regulates 2.5V power for FBVDDQ.
The APW7026 can monitor all the output voltages
(VTT ,NVVDD,FBVDDQ) and a single power good
signal is issued when the VTT is within 鹵 10% of
the reference voltage (V
REF1
) and the other levels
are above its lower power good threshold voltage.
Additional built-in overvoltage protection (OVP) will
be started when the VTT output is above 118% of
the V
REF1.
The OVP function will shutdown the upper
MOSFET and turn on the lower MOSFET
until the over-voltage is disappeared. The PWM
controllers over-current function monitors the out-
put current by sensing the voltage drop across the
upper MOSFET r
DS(ON)
, eliminating the need for a
current sensing resistor.
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Simple Single-Loop Control Design
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Voltage-Mode PWM Control
Excellent Output Voltage Regulation
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VTT Output
:
鹵1% Over Temperature
:
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NVVDD Output
:
鹵2% Over Temperature
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FBVDDQ Output:鹵2.5% Over Temperature
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Fast Transient Response
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On-Chip Feedback Compensation
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Full 0% to 100% Duty Ratio
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Power-Good Output Voltage Monitor
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Over-Voltage and Over-Current Fault Monitors
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Small Converter Size
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Constant Frequency Operation(200kHz)
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Programmable Oscillator from 50kHz to
800KHz
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Reduce External Component Count
Pin Description
UGATE 1
1
2
3
4
5
6
7
8
9
20
PHASE1
19
LGATE 1
18
PG ND
17
OCSET1
16
VSE N1
15
FB1
14
FB3
13
GATE
12
GND
11
V3.3
Applications
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VGA Card Power Regulation
VCC
UGATE 2
PHASE2
PG OOD
OCSET2
FB2
V5
SS
FAULT/RT
10
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.a.2 - Sep., 2001
1
www.anpec.com.tw
APW702612KC-TR相關(guān)型號PDF文件下載
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