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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)
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 : : * 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
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
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
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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
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 1.0 2.2 1.0 1.6 3.0 3.5 A A VGATE=4V GATE=FB3 -2.5 20 50 1.26 +2.5 V % mA -2 -1 2.0 +2 1.25 +1 V % V %
Copyright ANPEC Electronics Corp. Rev. A.2 - Sep., 2001
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APW7026
Electrical Characteristics Cont.
1. Recommended operating conditions, Unless otherwise noted. 2. Refer to Block and Simplified Power System Diagrams , and Typical Application Schematic.
APW 7026 Sym bol P R O T E C T IO N P a ra m e te r T e s t C o n d itio n s M in Ty p M ax U n it
V S E N 1 O . V . t r ip p o in t ( V S E N 1 / V R E F 1 ) V S E N 1 O . V . H y s t e r e s is V 3 . 3 O . V . t r i p p o in t V 3 . 3 O . V . H y s t e r e s is lO V P R F A U L T S o u r in g C u r r e n t O C S E T 1 ,2 C u rre n t S o u rc e
SS
V S E N 1 R is i n g V 3 . 3 R is i n g V F A U LT /R T = 2 . 0 V V o c s e t = 4 .5 V 170
11 8 2 4 .1 0 .1 25 200 23 230
% % V V mA uA K % % % V V V V 0 .8 V
P u l l u p r e s is t o r t o 5 V GOOD V S E N 1 U p p e r T h r e s h o ld (V S E N 1 /V R EF1) V S E N 1 L o w e r T h r e s h o ld V S E N 1 P G D H y s t e r e s is V 3 . 3 L o w e r T h r e s h o ld V 3 . 3 P G D H y s t e r e s is F B 3 L o w e r T h r e s h o ld F B 3 P G D H y s t e r e s is V F B 3 R is i n g lP G O O D = - 4 m A V S E N 1 R is i n g U p p e r / L o w e r T h r e s h o ld V 3 . 3 R is i n g V S E N 1 R is i n g
POW ER
11 0 94 2 2 .5 0 .1 1 .0 0 .1
V PGOOD
P G O O D V o lt a g e L o w
Functional Pin Description
UGATE1 (Pin 1) Connect UGATE1 pin to the SYNC PWM Converter's upper MOSFET gate .This pin provides the gate drive for the upper MOSFET. VCC (Pin 2) Provide a + 12V bias supply for the IC to this pin . This pin also provides the gate bias charge for all the MOSFETs controlled by the IC. The voltage at this pin is monitored for Power-On Reset (POR) purpose. UGATE2 (Pin 3) Connect UGATE2 pin to the ASYNC PWM converter's MOSFET gate . This pin provides the gate drive for the MOSFET. PHASE2 (Pin 4) Connect the PHASE2 pin to the ASYNC PWM converter's MOSFET source. This pin is used to monitor the voltage drop across the MOSFET for over-current protection. PGOOD (Pin 5) PGOOD is an open drain output used to indicate the status of the output voltages. This pin is pulled low when the SYNC PWM regulator output is not within 10% of the reference voltage (VREF1) or when V3.3 or VFB3 is below its lower power good threshold. OCSET2 (Pin 6) Connect a resistor (ROCSET ) from this pin to the drain of the ASYNC PWM converter's MOSFET . ROCSET, an internal 200A current source (IOCSET ) , and the MOSFET's on-resistance (rDS(ON)) set the converter's over-current (OC) trip point according to the following equation: IPEAK =
IO CSET x ROCSET rDS(ON)
An over-current trip cycles the soft-start function. FB2 (Pin 7) Connect this pin to the output of the ASYNC PWM converter . The voltage at this pin is regulated to the reference voltage VREF2 . A resistor driver is connected from this pin to VOUT2(ROUT2) and to GND(RGND2) that sets the output voltage as the following equation :
Copyright ANPEC Electronics Corp. Rev. A.2 - Sep., 2001
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APW7026
Functional Pin Description Cont.
OUT2 ) x VREF2 VOUT2 = ( 1+ R GND2
R
pass MOSFET. FB3 (Pin 14) Connect this pin to the output of the linear regulator . A resistor driver is connected from this pin to VOUT3 and GND that sets the output voltage as same as VOUT2. This pin is monitored for power good function. FB1 (Pin 15) This pin provides the feedback for the SYNC PWM converter. Typically this pin can be connected directly to the output of the converter . However , a resistor divider is recommended to be connected from this pin to VOUT1 and GND to adjust the output voltage as same as VOUT2. The value of the resistor connected from VOUT1 to FB1 must be less than 200. VSEN1 (Pin 16) This pin is connected to the SYNC PWM converter's output voltage . The PGOOD and OVP comparator cicuits use this signal to report output voltage status and over-voltage protection. OCSET1 (Pin 17) Connect a resistor (ROCSET ) from this pin to the drain of the SYNC PWM converter's upper MOSFET . The over-current (OC) trip point for the SYNC PWM converter is set by the ROCSET as same as the OCSET2. An over-current trip cycles the soft-start function. PGND (Pin 18) This is the power ground connection . Tie the SYNC PWM converter's lower MOSFET source to this pin. LGATE1 (Pin 19) Connect LGATE1 to the SYNC PWM converter's lower MOSFET gate . This pin provides the gate drive for the lower MOSFET. PHASE1 (Pin 20) Connect the PHASE1 pin to the SYNC PWM
The value of the resistor connected from VOUT2 to FB2 must be less than 150 . V5 (Pin 8) The +5V input voltage at this pin is monitored for power-on reset (POR) purpose. SS (Pin 9) This pin provides the soft-start for the all PWM converters and linear regulator . An internal resistor charges an external capacitor that is connected from 5V supply to this pin which ramps up the all outputs , preventing the outputs from overshooting as well as limiting the input current . The second function of the soft-start cap is to provides long off time for the synchronous MOSFET during current limiting . FAULT / RT (Pin 10) This pin provides oscillator switching frequency
adjustment . By placing a resistor ( RT ) from this pin to GND , the nominal 200kHz switching frequency is increased .Conversely, connecting a pull-up resistor ( RT ) from this pin to VCC reduces the switching frequency. Nominally , the voltage at this pin is 1.26V. In the event of an over-voltage or over-current internally pulled to VCC. condition , this pin is
V3.3 (Pin 11) This pin is connected to the +3.3V or the output of the ASYNC PWM converter for power good and over-voltage detection. When the output voltage of the ASYNC PWM converter is not in the range from 3V to 4V, connect this pin to +3.3V voltage. GND (Pin 12) Signal ground for the IC. All voltage levels are measured with respect to this pin. GATE (Pin 13) Connect this pin to the gate of an external MOSFET. This pin provides the drive for the linear regulator's
Converter's upper MOSFET source. This pin is used to monitor the voltage drop across the upper MOSFET for over-current protection.
Copyright ANPEC Electronics Corp. Rev. A.2 - Sep., 2001
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APW7026
Typical Performance Curves
10000
1000
RT ( k )
100
RT pull up to +12V
10
RT pull down to G ND
1 50 150 250 350 450 550 650 750
Switching Frequency ( kHz )
Reference Voltage Deviation(VREF1 )
1.0% 0.8% 0.6% 0.4% 0.2% 0.0% -0.2% -0.4% -0.6% -0.8% -1.0% 0 25 50 75 100
o
Reference Voltage Deviation(VREF2 )
1.0% 0.8% 0.6% 0.4% 0.2% 0.0% -0.2% -0.4% -0.6% -0.8% -1.0% 0 25 50 75 100
o
125
125
Junction Temperature ( C) Reference Voltage Deviation(VREF1 )
1.0% 0.8% 0.6% 0.4% 0.2% 0.0% -0.2% -0.4% -0.6% -0.8% -1.0% 0 25 50 75 100 125
Junction Temperature ( C)
Note : The Referance Voltage(VREF) Deviation is VREF(TJ) - VREF(25oC) VREF(25oC) x 100%
TJ is Junction Temperature.
rt
Junction Temperature (oC)
Copyright ANPEC Electronics Corp. Rev. A.2 - Sep., 2001
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APW7026
Simplified Power System Diagram
+5V Q3 ASYNC PWM Controller Linear Controller VOUT3 SYNC PWM Controller Q1 VOUT1 Q2 +3.3v
VOUT2
+3.3V
Q4
Typical Application Circuit
C812 220pF RX1 10R
L800 2uH +5V C807 330uF C808 330uF Q802 APM9410 L801 7.8uH NVVDD 2.05V/4A C810 330uF R814 100RF C811 330uF D800 FM5820
C809 220pF
+12V
R817 1.2K
L802 2uH AGP 3.3V C813 330uF Q803A APM7313 L803 Q803B 7.8uH APM7313 VTT 1.25V/3.5A C816 330uF C815 330uF C814 10uF
R812 1.5k
C801 1uF
R819 5.1R
R813 5.1R
1 2 3 4
UGATE1 VCC UGATE2 PHASE2 PHASE1 LGATE1 PGND OCSET1
R820 5.1R
20 19 18 17 16 15
5 6
PGOOD OCSET2
VSEN1 FB1
R821 R824 0R NC
7 FB2
5V
8
C805 1uF
V5 SS FAULT/RT
FB3 GATE GND V3.3
14 13 12 11
9 10
Q800 APM3055
AGP 3.3V C802 330uF
R816 4.02KF
APW7026-12 FBVDDQ 2.5V/1.5A C817 330uF
R811 100RF
R810 97.6RF
Copyright ANPEC Electronics Corp. Rev. A.2 - Sep., 2001
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APW7026
Packaging Information
SO - 300mil ( Reference JEDEC Registration MS-013)
D N
H
E
GAUGE PLANE
1
2
3
A e B A1
L
1
Dim A A1 B D E e H L N 1
Millimeters Min. Max. 2.35 0.10 0.33 7.40 10 0.40 0 2.65 0.30 0.51 7.60 10.65 1.27 8
Variations- D Variations Min. Max. SO-16 SO-18 SO-20 SO-24 SO-28 SO-14 10.10 11.35 12.60 15.20 17.70 8.80 10.50 11.76 13 15.60 18.11 9.20
Dim A A1 B D E e H L N 1
Inches Min. Max. 0.093 0.1043 0.004 0.0120 0.013 0.020 See variations 0.2914 0.2992 0.050BSC 0.394 0.016 0 0.419 0.050 8
Variations- D Variations Min. Max. SO-16 SO-18 SO-20 SO-24 SO-28 SO-14 0.398 0.413 0.447 0.463 0.496 0.512 0.599 0.614 0.697 0.713 0.347 0.362
See variations 1.27BSC
See variations
See variations
Copyright ANPEC Electronics Corp. Rev. A.2 - Sep., 2001
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APW7026
Physical Specifications
Terminal Material Lead Solderability Solder-Plated Copper (Solder Material : 90/10 or 63/37 SnPb), 100%Sn Meets EIA Specification RSI86-91, ANSI/J-STD-002 Category 3.
Reflow Condition
TP
(IR/Convection or VPR Reflow)
tp C ritical Zone T L to T P
R am p-up
T e m p e ra tu re
TL T sm ax
tL
T sm in R am p-down ts Preheat
25
t 25 C to Peak
T im e
Classificatin Reflow Profiles
Profile Feature Sn-Pb Eutectic Assembly Large Body Small Body Pb-Free Assembly Large Body Small Body 3C/second max. 150C 200C 60-180 seconds 3C/second max 217C 60-150 seconds 245 +0/-5C 250 +0/-5C 10-30 seconds 20-40 seconds
Average ramp-up rate 3C/second max. (TL to TP) Preheat - Temperature Min (Tsmin) 100C - Temperature Mix (Tsmax) 150C - Time (min to max)(ts) 60-120 seconds Tsmax to TL - Ramp-up Rate Tsmax to TL - Temperature(TL) 183C - Time (tL) 60-150 seconds Peak Temperature(Tp) 225 +0/-5C 240 +0/-5C Time within 5C of actual Peak 10-30 seconds 10-30 seconds Temperature(tp) Ramp-down Rate 6C/second max. 6 minutes max. Time 25C to Peak Temperature
Copyright ANPEC Electronics Corp. Rev. A.2 - Sep., 2001 9
6C/second max. 8 minutes max.
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Note: All temperatures refer to topside of the package. Measured on the body surface.
APW7026
Reliability test program
Test item SOLDERABILITY HOLT PCT TST ESD Latch-Up Method MIL-STD-883D-2003 MIL-STD-883D-1005.7 JESD-22-B, A102 MIL-STD-883D-1011.9 MIL-STD-883D-3015.7 JESD 78 Description 245C , 5 SEC 1000 Hrs Bias @ 125 C 168 Hrs, 100 % RH , 121C -65C ~ 150C, 200 Cycles VHBM > 2KV, VMM > 200V 10ms , Itr > 100mA
Tape & Reel Dimensions
t Po P P1 D
E
F W
Bo
Ao
Ko D1 T2
J C A B
T1
Application SOP- 28 Application SOP- 28
A 3301 F
B 62 1.5 D
C 12.75 0. 5 D1 1.5+ 0.25
J 2 0.6 Po 4.0 0.1
T1 24.4 0.2 P1
T2 2 0.2 Ao
W 24 0.3 Bo
P 12 0.1 Ko
E 1.75 0.1 t
11.5 0.1 1.5 +0.1
2.0 0.1 10.85 0.1 18.34 0.1 2.97 0.1 0.350.01
(mm)
Copyright ANPEC Electronics Corp. Rev. A.2 - Sep., 2001
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APW7026
Cover Tape Dimensions
Application SOP- 28 Carrier Width 24 Cover Tape Width 21.3 Devices Per Reel 1000
Customer Service
Anpec Electronics Corp. Head Office : 5F, No. 2 Li-Hsin Road, SBIP, Hsin-Chu, Taiwan, R.O.C. Tel : 886-3-5642000 Fax : 886-3-5642050 Taipei Branch : 7F, No. 137, Lane 235, Pac Chiao Rd., Hsin Tien City, Taipei Hsien, Taiwan, R. O. C. Tel : 886-2-89191368 Fax : 886-2-89191369
Copyright ANPEC Electronics Corp. Rev. A.2 - Sep., 2001
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