Synchronous Buck Linear Controller Provide Regulated Voltages Syn

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Synchronous Buck Linear Controller Provide Regulated Voltages Syn

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APW7063
Synchronous Buck Linear Controller
Provide Regulated Voltages Synchronous Rectified Buck Controller Linear Controller
General Description
APW7063 integrates linear controller, well monitoring protection functions into single package. synchronous cont roller which drives dual N-channel MOSFETs, which provides controlled power outputs with under-voltage over-current protect ions Linear cont roller drives ernal hannel with under-volt protection. APW7063 provides excellent regulation output load variation. internal 0.8V temperature-compensated reference voltage designed meet various output voltage applications 7063 ludes 250kHz free-running riangle-wave illator that adjust able from below 70KHz over 800KHz. power-on-reset (POR) circuit limits minimum opearting upply voltage ontroller working well. Over current protec tion achieved monit oring volt drop MOSFET, eliminating need current sensing resistor short circuit condition detected through pin. over-current protection riggers soft -start function until fault events removed, Under-voltage protection will shutdown directly. Pull COMP below 0.4V will shutdown controller, both gate drive signals will low.
Fast Transient Response 0~85% Duty Ratio Excellent Output Voltage Regulation 0.8V Internal Reference Over Line Voltage Temperature
Over Current Protection Sense Low-Side MOSFET' RDS(ON) Under Voltage Lockout Small Converter Size 250KHz Free-Running Oscillator Programmable From 70kHz 800kHz
14-Lead SOIC Package Lead Free Available (RoHS Compliant)
Applications
Graphic Cards Memory Power Supplies Cable MODEMs Boxes Low-Voltage Distributed Power Supplies
Pinouts
VREG COMP PHASE DRIVE LGATE PGND BOOT UGATE
ANPEC reserves right make changes improve reliability manufacturability without notice, advise customers obtain latest version relevant information verify before placing orders. opyright ANPEC Electronics orp. Rev. Nov., 2005 www.anpec.com.tw
APW7063
Ordering Marking Information
APW7063
Lead Free Code Handling Code Temp. Range Package Code Package Code Operating Ambient Temp. Range Handling Code Tube Tape Reel Lead Free Code Lead Free Device Blank Original Device XXXXX Date Code
APW7063
APW7063 XXXXX
ANPEC d-fre ducts ntain comp attach matte rmin atio nish full compl iant with compa tibl both SnPb ad-free sold ieri ad-free produ exceed -free uireme /JEDEC classi ficati d-fre temp ture.
Block Diagram
Power-On Reset 5.8V 10uA
BOOT
Gate Control
UGATE
IOCSET 250uA
Soft Start Fault Logic
PHASE
50%V
U.V.P Comparator
O.C.P Comparator
LGATE PGND
50%V Error Comparator
VREF Oscillator Triangle Wave Regulator
DRIVE
COMP
VREG
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APW7063
Application Circuit
Boot-Strap Internal Regulator
470uF 6.3V 25mR 1N4148 0.1uF APW7063 DRIVE VREG LGATE COMP PGND BOOT PHASE UGATE /SHDN 470uF 6.3V 25mR 4.7uF 3.125KF 820R 0.1uF APM4220 2.2uH 100R 2.32KF 0.1uF 1000uF 6.3V 30mR 1000uF 6.3V 30mR APM4220 2.5V 4.7uF 470uF 25mR 470uF 25mR 470uF 25mR
APM3055L
56pF
SR24 2A/40V
4.7uF
0.01uF
1.07KF
Boot-Strap External Power
470uF 6.3V 25mR 0.1uF APW7063 DRIVE VREG LGATE COMP PGND BOOT PHASE UGATE /SHDN 470uF 6.3V 25mR 4.7uF 3.125KF 620R 0.1uF APM4220 1N4148 2.2uH 100R 2.32KF 0.1uF 1000uF 6.3V 30mR 1000uF 6.3V 30mR APM4220 2.5V 4.7uF 470uF 25mR 470uF 25mR 470uF 25mR
APM3055L
56pF
SR24 2A/40V
4.7uF
0.01uF
1.07KF
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APW7063
Absolute Maximum Ratings
Symbol LGATE DRIVE UGATE VBOOT LGATE DRIVE UGATE BOOT PHASE Operating Junction Temperature TSDR VESD Storage Temperature Soldering Temperature Seconds) Minimum Rating Parameter Rating 0~150 Unit
Recommended Operating Conditions
Symbol VBOOT Supply Voltage Boot Voltage Parameter Min. Nom. Max. Unit
Thermal Characteristics
Symbol Parameter Junction Ambient Resistance free (SOP-14) Value Unit
Electrical Characteristics
Unless otherswise specified, these specifications apply over 12V, VBOOT 12V, 70oC. Typlcal values 25oC.
Symbol SUPPLY CURRENT
Parameter
Test Conditions
APW7063
Unit
Nominal Supply Rising Threshold Falling Threshold
UGATE LGATE Open
VP-P
POWER-ON-RESET
OSCILLATOR Free Running Frequency Total Variation Ramp Amplitude
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APW7063
Electrical Characteristics (Cont.)
Unless otherswise specified, these specifications apply over 12V, VBOOT 12V, 70oC. Typlcal values 25oC.
Symbol REFERENCE VREF
Parameter
Test Conditions
APW7063 0.80
Unit
Reference Voltage Reference Voltage Tolerance
EEEOR AMPLIFIER Gain UGATE Duty Range Input Current GATE DRIVERS IUGATE RUGATE ILGATE RLGATE Upper Gate Source Upper Gate Sink Lower Gate Source Lower Gate Sink Dead Time VBOOT 12V, VUGATE IUGATE 0.3A 12V, VLGATE ILGATE 0.3A
LINEAR REGULATOR Reference Voltage Regulation Output Drive Current PROTECTION Under Voltage Level Under Voltage Level OCSET Source Current VREG VREG IOUT Output Voltage Accuracy Output Current Capacity Internal Soft-Start Interval Soft-Start Charge Current Shutdown Threshold Shutdown Hysteresis COMP Falling VDRIVE
SOFT START SHUTDOWN
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APW7063
Functional Description
(Pin This adjust switching frequency. Connect resistor from decreasing switching frequency, Conversely, connect resistor from increasing witc hing frequency (see pical Characteristics). (Pin Connect capacitor from this soft -start interval converter. internal 10µA current source charges this capacitor 5.2V. voltage clamps reference voltage voltage, Figure1 shows soft-start interval. internal sourc current starts charge capacitor internal 0.8V reference also starts rise follows Until internal reference reaches 0.8V soft-st interval completed. This method provides rapid controlled output voltage Soft-Start output same output1, starts from 2.2V 3.0V. 7063 provides ernal oft-S tart whic ternal Soft-Start interval slower than internal erval 025uF) ternal capacitor, Soft-S tart will follow internal SoftSt art. VREG (Pin internal regulator will upply boost voltage, capacitor recommended stability. VREG voltage variation other interference, work normally. VCC< don' VREG BOOST voltage. (Pin inverting input error amplifier, receives feedback voltage from external resistive divider across output (VOUT). output voltage determined
VOUT 0.8V
VOLTAGE
SOFT
START
OUT2 OUT1
TIME
Figure Soft-Start Interval
0.8V TSoft-Start 0.8V
Where: external Soft-Start capacitor Soft-Start current 10µA
ROUT RGND
where ROUT resistor connected from VOUT RGND resistor connected from GND. When voltage under Vref, will cause under voltage protection, shutdown device. Remove condition restart voltage pull COMP from high once, will enable device again.
2.2V
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APW7063
Functional Description (Cont.)
COMP (Pin This output error amplifier. external resis capacitor network provide loop compens ation onvert (see pplic Information). Pull this below 0.4V will shutdown controller, forcing UGATE LGATE signals soft start cycle will initiated upon release this pin. (Pin Signal ground PHASE (Pin resistor (ROCSET) connected ween this drain low-side MOSFET will determine over current limit. internally generated 250uA current source will flow through this resistor, creating voltage drop. This voltage will compared with voltage ross low-side MOSFET. threshold over current limit therefore given DRIVE (Pin Connect this gate external N-channel transis tor. This provides gate voltage linear regulator pass transistor. also provides means compensating linear controller applications where user needs optimize regulator transient response. (Pin Connec this linear regulator proper ized resistor divider. voltage this regulat 0.8V output voltage determined using following formula
VOUT 0.8V
PGND (Pin Power ground gate diver. Connect lower MOSFET source this pin. LGATE (Pin This provides gate drive signal side MOSFET. (Pin This provides supply voltage device, when above rising threshold 4.2V, turns device turned conversely, below falling threshold 3.9V, device turned off. decoupling capacitor recommended.
OCSET
ILIMIT DS(ON) 250uA
over current condit will func tion over current condition removed. Because comparator delay time, time low-side MOSFET must longer than 800ns have over current protection work. UGATE (Pin This provides gate drive high-side MOSFET. BOOT (Pin This provides supply voltage high side driver. driving logic level N-channel MOSEFT, boots trap circuit create suitable driver' supply.
ROUT RGND
where ROUT resistor connected from VOUT FBL, RGND resistor connected from GND. This also monitores under-voltage events, linear regulator used, VREG.
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APW7063
Typical Characteristics
Power
Power Down
CC=VIN1=12V IN2=5V, CSS=0.1µF
VCC(10V/div)
VCC=VIN1 =12V VIN2=5V, CSS=0.1µF
VCC(10V/div)
SS(5V/div) SS(5V/div)
VOUT1(2V/div)
VOUT1(2V/div)
VOUT2(2V/div)
VOUT2(2V/div)
Time (10ms/div)
Time (10ms/div)
Enable (COMP left open)
=VIN1=12V VIN2 =5V, CSS=0.1µF
Shutdown (COMP pulled GND)
CC=VIN1=12V IN2=5V, CSS=0.1µF
VOUT2(2V/div)
VOUT2(2V/div)
VOUT1(2V/div)
VOUT1(2V/div)
COMP(1V/div)
COMP(1V/div)
SS(5V/div) SS(5V/div)
Time (10ms/div)
Time (2ms/div)
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APW7063
Typical Characteristics (Cont.)
UGATE Falling
VCC=2V, VIN=12V
UGATE Rising
VCC=2V, N=12V
LGATE(10V/div)
LGATE(10V/div)
PHASE(10V/div)
PHASE(10V/div)
UGATE(10V/div)
UGATE(10V/div)
Time (50ns/div)
Time (50ns/div)
Under Voltage Protection (PWM)
VCC=12,VIN=12V VOUT=3.3V, L=2.2mH
Under Voltage Protection (Linear)
IL(10A/div)
SS(5V/div)
VCC=12V, VIN=5V VOUT2=2.5V
SS(5V/div) VOUT1 (2V/div)
UGATE (10V/div)
VOUT2(2V/div)
DRV(5V/div)
Time (5us/div)
Time (5us/div)
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APW7063
Typical Characteristics (Cont.)
Load Transient
VCC=12V VIN=12V VOUT=3.3V COUT =470mFx2 ESR=22.5mW L=1.5mH f=400kHz
Linear Load Transient
VCC=12V VIN=12V VOUT=2.5V COUT=470mF
VOUT2(100mV/div)
VOUT1(100mV/div)
IOUT2(1A/div)
IOUT1(5A/div)
Time (20us/div)
Time (10us/div)
UGATE Source Current UGATE Voltage
UGATE Sink Current UGATE Voltage
UGATE Source Current
VBOOT=12V
VBOOT=12V
UGATE Sink Current
UGATE Voltage
UGATE Voltage
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APW7063
Typical Characteristics (Cont.)
LGATE Source Current LGATE Voltage
LGATE Sink Current LGATE Voltage
LGATE Source Current
VCC=12V
VCC=12V
LGATE Sink Current
LGATE Voltage
LGATE Voltage
Over Current Protection
VCC=12V,VIN=12V, VOUT=2.5V, ROCSET=1kW RDS(ON)=16mW, L=2.2mH, IOUT=15A
Switching Frequence Resistance
10000
IL(10A/div)
Resistance
1000
pull
SS(5V/div)
UGATE(20V/div)
pull down
VOUT1(2V/div)
1000
Time (5us/div)
Switching Frequency (kHz)
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APW7063
Typical Characteristics (Cont.)
Comp Sink Current Comp Voltage
VCC=12V
Comp Source Current Comp Voltage
VCC=12V
Source Current (µA)
Sink Current (µA)
Comp Voltage
Comp Voltage
Drive Sink Current Drive Voltage
VCC=12V
Drive Source Current Drive Voltage
VCC=12V
Source Current (mA)
Sink Current (mA)
Drive Voltage
Drive Voltage
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APW7063
Typical Characteristics (Cont.)
VREG Voltage Supply Voltage
VREG Voltage Load Current
VCC=12V
VREG Voltage
VREG Voltage
6.25
5.75
Supply Voltage
Load Current (mA)
Supply Current Supply Voltage
Reference Voltage Temperature
Reference Voltage
Supply Current (mA)
0.798
0.796
ICC(SHDN)
0.794
0.792
0.79
Supply Voltage
Temperature (°C)
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APW7063
Application Information
Component Selection Guidelines
Output Capacitor Selection select COUT determined required effective series resistanc voltage apac requirement Therefore select high performance capacitors that intended switching regulator applications. some applications, multiple capacitors have paralled achieve desired value. tantalum capacitors used, make sure they surge tested manufactures. doubt, consult capacitors manufac turer. Input Capacitor Selection input capacitor chosen based volt rating current rating. reliable operation, select capacitor voltage rating least times higher than maximum input voltage. maximum current rating requirement approximately IOUT/2 where IOUT load current. During power input capacitors have handle large amount surge current. tantalum capacitors used, make sure they surge tested manufactures. doubt, consult capacitors manufacturer. high frequency decoupling, ceramic apacitor between 0.1uF connected between ground pin. Inductor Selection inductance inductor determined output voltage requirement. larger inductance, lower inductor' current ripple. This will translate into lower output ripple voltage. ripple current ripple voltage approximated VOUT VOUT IRIPPLE where switching frequency regulator. VOUT IRIPPLE
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There tradeoff exists between inductor' ripple current regulator load transient response time smaller inductor will give regulator faster load trans ient ponse expens higher ripple current vice versa. maximum ripple current occurs maximum input voltage. good starting point choose ripple current approximately maximum output current. Once induct ance value been chosen, elect inductor that capable carrying required peak current without going into aturation. induc tors, ially core that make ferrite, ripple current will increase abruptly when saturates. This will result larger output ripple voltage. Compensation output filter step down converter introduces double pole, which contributes with -40dB/decade gain slope degrees phase shift control loop. compensation network between COMP ground should added. simplest loop compensation network shown Fig. filter consist output induc output capacitors. transfer function filter given GAINLC
COUT COUT COUT
poles zero this transfer function are:
COUT
COUT
FESR
double poles filter, FESR zero introduced output capacitor.
APW7063
Application Information (Cont.)
Compensation (Cont.)
PHASE COUT Output
compens ation circuit shown Figure introduce zero introduces pole reduce switching noise. transfer function error amplifier given GAINAMP
Figure Output Filter
-40dB/dec FESR Gain -20dB/dec
pole zero compensation network are:
Frequency
Error Amplifier COMP
Figure Filter Gain Frequency modulator shown Figure. input output error amplifier output node. trans func tion modulator given GAINPWM
Driver
Figure Compensation Network losed loop gain converter written GAINLC GAINPWM
Comparator VOSC Output Error Amplifier Driver PHASE
GAINAMP
Figure shows converter gain following guidelines will help ompens network. 1.Select desired zero crossover frequency (1/5 1/10) >FO>FZ following equation calculate Figure Modulator
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APW7063
Application Information (Cont.)
Compensation (Cont.) losses MOSFET have components: conduction
Where:
loss rans loss. upper lower MOSFET, losses approximately given following PUPPER Iout TC)(RDS(ON))D (0.5)(Iout)(VIN)(tsw)FS
900uA/V 2.Place zero before filter double poles FLC: 0.75 Calculate equation:
PLOWER Iout TC)(RDS(ON))(1-D)
where IOUT load current temperature dependency RDS(ON) switching frequency switching interval duty cycle Note that both MOSFETs have conduction losses while upper MOSFET include additional transition loss. switching internal, tsw, function reverse transfer capac CRSS. Figure illustrat switching waveform internal MOSFET. (1+TC) term factor temperature dependency RDS(ON) extracted from "RDS(ON)
=0.75FLC
log(gmR3)
0.75
pole half switching frequency: 0.5xFS Calculate equation:
Temperature" curve power MOSFET
FP=0.5FS
Linear Regulator Input/Output Capacitor Selection input capacitor chos based voltage rating. Under load transient condition, input capacitor will momentarily supply required transient current.
Compensation Gain
Gain
VOSC
FESR
Filter Gain Converter Gain
ceramic apac will sufficient inmost applications. output capacitor linear regulator chosen minimize droop during load transient condition. addition, capacitor chosen based voltage rating. Linear Regulator MOSFET Selection
Frequency
Figure Converter Gain Frequency MOSFET Selection
maximum DRIVE voltage determined VCC. selection N-channel power MOSFETs determined RDS(ON), reverse transfer capacitance (CRSS) maximum current requirement.The Since this drives external N-channel MOSFET, therefore imum output volt linear regulator dependent upon VGS.
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APW7063
Application Information (Cont.)
MOSFET Selection (Cont.) VOUT2MAX VCC- Another criteria efficiency heat removal.
Voltage across drain source MOSFET
power dissipated MOSFET given Pdiss Iout (VIN VOUT2) where Iout maximum load current Vout2 nominal output voltage some applications, heatsink maybe required help maint junction temperature MOSFET below maximum rating. Layout Considerations high power switching regulator, correct layout important ensure proper operation regulator. general, erconnec ting impedanc should minimized using short, wide printed circuit traces. Signal power grounds kept separate finally combined using ground plane cons truction single point grounding. Figure illustrates layout, with bold lines indicating high current paths. Components along bold lines should placed close together. Below checklist your layout:
Time
Figure Switching waveform across MOSFET
APW7063 PGND
LGATE UGATE PHASE
Keep switching nodes (UGATE, LGATE
away from ensit small signal nodes since these nodes fast moving signals. Therefore keep traces these nodes short possible.
Figure Recommended Layout Diagram
ground return must return combine
COUT terminal.
Capacitor CBOOT should connected close
BOOT PHASE pins possible.
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APW7063
Package Information
(150mil)
Millimeters Min. 1.477 0.102 0.331 0.191 8.558 3.82 1.274 5.808 0.382 6.215 1.274 0.228 0.015 Max. 1.732 0.255 0.509 0.2496 8.762 3.999 Min. 0.058 0.004 0.013 0.0075 0.336 0.150
Inches Max. 0.068 0.010 0.020 0.0098 0.344 0.157 0.050 0.244 0.050
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APW7063
Physical Specifications
Terminal Material Lead Solderability Solder-Plated Copper (Solder Material 90/10 63/37 SnPb), 100%Sn Meets Specification RSI86-91, ANSI/J-STD-002 Category
(IR/Convection Reflow)
Reflow Condition
Ramp-up
Critical Zone
Temperature
Tsmax
Tsmin Ramp-down Preheat
Peak
Time
Classification Reflow Profiles
Profile Feature Sn-Pb Eutectic Assembly Pb-Free Assembly Average ramp-up rate 3°C/second max. 3°C/second max. Preheat 100°C 150°C Temperature (Tsmin) 150°C 200°C Temperature (Tsmax) 60-120 seconds 60-180 seconds Time (min max) (ts) Time maintained above: 183°C 217°C Temperature (TL) 60-150 seconds 60-150 seconds Time Peak/Classificatioon Temperature (Tp) table table Time within actual 10-30 seconds 20-40 seconds Peak Temperature (tp) Ramp-down Rate 6°C/second max. 6°C/second max. minutes max. minutes max. Time Peak Temperature Notes: temperatures refer topside package .Measured body surface.
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APW7063
Classification Reflow Profiles(Cont.)
Table SnPb Entectic Process Package Peak Reflow Temperatures Package Thickness Volume <350 <2.5 +0/-5° +0/-5° Volume +0/-5° +0/-5°
Table Pb-free Process Package Classification Reflow Temperatures Package Thickness Volume Volume Volume <350 350-2000 >2000 <1.6 *Tolerance: device manufacturer/supplier shall assure process compatibility including stated classification temperature (this means Peak reflow temperature example 260° C+0° rated level.
Reliability Test Program
Test item SOLDERABILITY HOLT Method MIL-STD-883D-2003 MIL-STD 883D-1005.7 JESD-22-B, A102 MIL-STD 883D-1011.9 Description 245°C,5 1000 Bias 125°C Hrs, 100% 121°C -65°C 150°C, Cycles
Carrier Tape Reel Dimensions
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APW7063
Carrier Tape Reel Dimensions(Cont.)
Application
SOP-14 (150mil) 330REF 100REF 0.50 13.0 1.50 (MIN) 16.0 2.10 0.05 1.75
16.5REF
(mm)
Cover Tape Dimensions
Application SOP- Carrier Width Cover Tape Width 21.3 Devices Reel 2500
Customer Service
Anpec Electronics Corp. Head Office No.6, Dusing Road, SBIP, Hsin-Chu, Taiwan, R.O.C. 886-3-5642000 886-3-5642050 Taipei Branch 137, Lane 235, Chiao Rd., Hsin Tien City, Taipei Hsien, Taiwan, 886-2-89191368 886-2-89191369
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Synchronous Buck Linear Controller Provide Regulated Voltages Syn

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