APW7026 Datasheet, PDF (1/11 Pages) Anpec Electronics Coropration – Advanced PWM and Dual Linear Power Controllers

APW7026
Features
Advanced PWM and Dual Linear Power Control
General Description
• 3 Regulated Voltage are provided
• SYNC Switching Power for VTT(1.25V)
• ASYNC Switching Power for NVVDD(2.05V)
• Linear Regulator for FBVDDQ(2.5V)
• Simple Single-Loop Control Design
• Voltage-Mode PWM Control
• Excellent Output Voltage Regulation
• VTT Output:: ±1% Over Temperature
• NVVDD Output:: ±2% Over Temperature
• FBVDDQ Output:±2.5% Over Temperature
• Fast Transient Response
• On-Chip Feedback Compensation
• Full 0% to 100% Duty Ratio
• Power-Good Output Voltage Monitor
• Over-Voltage and Over-Current Fault Monitors
• Small Converter Size
• Constant Frequency Operation(200kHz)
• Programmable Oscillator from 50kHz to
800KHz
• Reduce External Component Count
Applications
• VGA Card Power Regulation
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 ± 10% of
the reference voltage (VREF1) 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 VREF1.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 rDS(ON), eliminating the need for a
current sensing resistor.
Pin Description
UGATE 1 1
VCC 2
UGATE 2 3
PHASE2 4
PG OOD 5
OCSET2 6
FB2 7
V5 8
SS 9
FAULT/RT 10
20 PHASE1
19 LGATE 1
18 PG ND
17 OCSET1
16 VSE N1
15 FB1
14 FB3
13 GATE
12 GND
11 V3.3
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 - Sep., 2001
www.anpec.com.tw