Document
APW7026
Advanced PWM and Dual Linear Power Control
Features
•
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)
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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 ± 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 output current by sensing the voltage drop across the upper MOSFET rDS(ON), eliminating the need for a current sensing resistor.
• •
Simple Single-Loop Control Design • Voltage-Mode PWM Control Excellent Output Voltage Regulation • VTT Output: : ±1% Over Temperature : ±2% Over Temperature • NVVDD Output: • 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
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
• 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 ANPEC Electronics Corp. Rev.a.2 - Sep., 2001 1 www.anpec.com.tw
APW7026
Ordering information
APW 7026
L e a d F re e C o d e H a n d lin g C o d e Tem p. R ange P ackage C ode V o lta g e C o d e V o lta g e C o d e 1 2 : 1 .2 5 V P ackage C ode K : SO P - 20 Tem p. R ange C : 0 to 7 0 ° C H a n d lin g C o d e TU : Tube TR : Tape & Reel L e a d F re e C o d e L : L e a d F re e D e v ic e B la n k : O rig in a l D e v ic e
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Block Diagram
VSEN1 O CSET1 VCC V5
FB3 G ATE
V REF 3 1 .2 6 V 0 .3 V
LU V
110%
P O W E R -O N RESET
PGOOD
90%
O CSET2
200uA VCC THERMAL P R O T E C T IO N 118% 200uA
UG ATE2 PHASE2
D R IV E 2
OC2 VCC
GATE CONTROL
IN H IB IT FAULT PW M2 S O F T -S T A R T AN D FA U LT L O G IC
0V OC1
D R IV E 1
UG ATE1 PHASE1
FB2
V REF 2 2 .0 V ERROR AM P2 ERROR AM P1
IN H IB IT GATE CONTROL PW M1 VCC
LG ATE1
5V
V 3 .3
23K
O S C IL L A T O R
LO W ER D R IV E V REF 1
PGND
2 .5 V
4 .1 V 4 .6 V
GND
F A U L T /R T
SS
FB1
Absolute Maximum Ratings
Symbol
VCC V I , VO TA TJ TS TG TS
Parameter
Supply Voltage Input , Output or I/O Voltage Operating Ambient Temperature Junction Temperature Storage Temperature Soldering Temperature
Rating
15 GND -0.3 V to VCC +0.3 Range 0 to 70 Range 0 to 125 Range -65 to +150 300 ,10 seconds
Unit
V V
o o o o
C C C C
Copyright ANPEC Electronics Corp. Rev. A.2 - Sep., 2001
2
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APW7026
Thermal Characteristics
Symbol
R JA
Parameter
Thermal Resistance in Free Air SOIC SOIC (with 3in 2 of Copper)
Value
75 65
Unit
o
C
Electrical Characteristics
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1. Recommended operating conditions, Unless otherwise noted. 2. Refer to Block and Simplified Power System Diagrams , and Typical Application Schematic.
APW7026 Symbol SUPPLY CURRENT ICC Nominal Supply Current UGATE1, LGATE1, UGATE2, and GATE Open 6 mA Parameter Test Conditions Min Typ Max Unit
POWER-ON RESET Rising VCC Threshold Falling VCC Threshold Rising V5 Threshold Falling V5 Threshold OSCILLATOR FOSC ∆VOSC Free Running Frequency Ramp Amplitude RT = Open RT = Open 185 200 1.9 215 kHz V 3.7 8.2 9.5 9.0 4.4 4.0 4.7 10.4 V V V V
PWM CONTROLLER REFERENCE VOLTAGE VREF1 SYNC PWM Controller Reference Voltage VREF1 Accuracy VREF2 ASYNC PWM Controller Reference Voltage VREF2 Accuracy LINEAR CONTROLLER VREF3 Reference Voltage VREF3 Accuracy GATE Drive Current PWM CONTROLLERS GATE DRIVERS IUGATE RUGATE ILGATE RLGATE UGATE1,2 Source UGATE1,2 Sink LGATE1 Source LGATE1 Sink VCC = 12V, VUGATE1 (or VUGATE2 ) = 6V VCC = 12V, VUGATE1 (or VUGATE2 ) = 1V VCC = 12V, VLGATE1 = 1V VCC = 12V, VLGATE1 = 1V 1..