Product Sample & Technical Tools & Support & Folder Buy Documents Software Community TPS54527 SLVSAY5D–JULY2011–REVISEDAUGUST2016 TPS54527 4.5-V to 18-V Input, 5-A Synchronous Step-Down Converter 1 Features 3 Description • D-CAP2™ModeEnablesFastTransient The TPS54527 is an adaptive on-time D-CAP2 mode 1 synchronous buck converter. The TPS54527 enables Response system designers to complete the suite of various • LowOutputRippleandAllowsCeramicOutput end equipment’s power bus regulators with a cost Capacitor effective, low component count, low standby current • WideInputVoltageRange:4.5Vto18V solution. The main control loop for the TPS54527 uses the D-CAP2 mode control which provides a fast • OutputVoltageRange:0.76Vto6V transient response with no external compensation • HighlyEfficientIntegratedFETsOptimizedfor components. The TPS54527 also has a proprietary LowerDutyCycleApplications:65mΩ(HighSide) circuit that enables the device to adopt to both low and36mΩ(LowSide) equivalent series resistance (ESR) output capacitors, • HighEfficiency:LessThan10µAatShutdown such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors. The device operates from a 4.5-V • HighInitialBandgapReferenceAccuracy to 18-V input. The output voltage can be programmed • AdjustableSoftStart from 0.76 V to 6 V. The device also features an • PrebiasedSoftStart adjustable soft-start time. The TPS54527 is available • 650-kHzSwitchingFrequency in the 8-pin DDA package, and designed to operate from –40°Cto85°C. • Cycle-by-CycleOvercurrentLimit DeviceInformation(1) 2 Applications PARTNUMBER PACKAGE BODYSIZE(NOM) • WideRangeofApplicationsforLowVoltage TPS54527 SOPowerPAD(8) 4.89mm×3.90mm System (1) For all available packages, see the orderable addendum at – DigitalTVPowerSupply theendofthedatasheet. – HighDefinitionBlu-rayDisc™Players – NetworkingHomeTerminal – DigitalSetTopBox(STB) LoadTransientResponse SimplifiedSchematic Vout (50 mV/div) TPS54527 Iout (2A/div) Copyright © 2016,Texas Instruments Incorporated t - Time - 100ms/div 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

TPS54527 SLVSAY5D–JULY2011–REVISEDAUGUST2016 www.ti.com Table of Contents 1 Features.................................................................. 1 7.4 DeviceFunctionalModes..........................................9 2 Applications........................................................... 1 8 ApplicationandImplementation........................ 11 3 Description............................................................. 1 8.1 ApplicationInformation............................................11 4 RevisionHistory..................................................... 2 8.2 TypicalApplication..................................................11 5 PinConfigurationandFunctions......................... 3 9 PowerSupplyRecommendations...................... 14 6 Specifications......................................................... 3 10 Layout................................................................... 14 6.1 AbsoluteMaximumRatings......................................3 10.1 LayoutGuidelines.................................................14 6.2 ESDRatings..............................................................4 10.2 LayoutExample....................................................15 6.3 RecommendedOperatingConditions.......................4 10.3 ThermalConsideration..........................................15 6.4 ThermalInformation..................................................4 11 DeviceandDocumentationSupport................. 16 6.5 ElectricalCharacteristics...........................................5 11.1 DocumentationSupport........................................16 6.6 TimingRequirements................................................5 11.2 ReceivingNotificationofDocumentationUpdates16 6.7 TypicalCharacteristics..............................................6 11.3 CommunityResources..........................................16 7 DetailedDescription.............................................. 8 11.4 Trademarks...........................................................16 7.1 Overview...................................................................8 11.5 ElectrostaticDischargeCaution............................16 7.2 FunctionalBlockDiagram.........................................8 11.6 Glossary................................................................16 7.3 FeatureDescription...................................................8 12 Mechanical,Packaging,andOrderable Information........................................................... 16 4 Revision History NOTE:Pagenumbersforpreviousrevisionsmaydifferfrompagenumbersinthecurrentversion. ChangesfromRevisionC(May2012)toRevisionD Page • AddedESDRatingstable,FeatureDescriptionsection,DeviceFunctionalModes,ApplicationandImplementation section,PowerSupplyRecommendationssection,Layoutsection,DeviceandDocumentationSupportsection,and Mechanical,Packaging,andOrderableInformationsection.................................................................................................. 1 • DeletedOrderingInformationtable;seePOAattheendofthedatasheet........................................................................... 1 ChangesfromRevisionB(January2012)toRevisionC Page • Changedt From:310nsTo:330ns............................................................................................................................ 5 OFF(MIN) ChangesfromRevisionA(November2011)toRevisionB Page • Changedequation1denominatorfrom2to6........................................................................................................................ 8 ChangesfromOriginal(July2011)toRevisionA Page • Changedpinoutdrawingtocorrectpins5,6,7,8location.................................................................................................... 3 2 SubmitDocumentationFeedback Copyright©2011–2016,TexasInstrumentsIncorporated ProductFolderLinks:TPS54527

TPS54527 www.ti.com SLVSAY5D–JULY2011–REVISEDAUGUST2016 5 Pin Configuration and Functions DDAPackage 8-PinSOPowerPAD TopView EN 1 8 VIN VFB 2 7 VBST Thermal Pad VREG5 3 6 SW SS 4 5 GND Not to scale PinFunctions PIN I/O DESCRIPTION NAME NO. EN 1 I Enableinputcontrol.ENisactivehighandmustbepulleduptoenablethedevice. VFB 2 I Converterfeedbackinput.Connecttooutputvoltagewithfeedbackresistordivider. 5.5-Vpowersupplyoutput.Acapacitor(typically1µF)mustbeconnectedtoGND.VREG5isnotactive VREG5 3 O whenENislow. SS 4 I Soft-startcontrol.AnexternalcapacitormustbeconnectedtoGND. Groundpin.Powergroundreturnforswitchingcircuit.ConnectsensitiveSSandVFBreturnstoGNData GND 5 — singlepoint. SW 6 O Switchnodeconnectionbetweenhigh-sideNFETandlow-sideNFET. Supplyinputforthehigh-sideFETgatedrivecircuit.Connect0.1-µFcapacitorbetweenVBSTandSWpins. VBST 7 O AninternaldiodeisconnectedbetweenVREG5andVBST. VIN 8 I Inputvoltagesupplypin. Thermal Back Thermalpadofthepackage.Mustbesolderedtoachieveappropriatedissipation.Mustbeconnectedto — Pad side GND. 6 Specifications 6.1 Absolute Maximum Ratings overoperatingfree-airtemperaturerange(unlessotherwisenoted)(1) MIN MAX UNIT VIN,EN –0.3 20 VBST –0.3 26 VBST(10-nstransient) –0.3 28 Inputvoltage VBST(vsSW) –0.3 6.5 V VFB,SS –0.3 6.5 SW –2 20 SW(10-nstransient) –3 22 VREG5 –0.3 6.5 Outputvoltage V GND –0.3 0.3 VoltagefromGNDtothermalpad,V –0.2 0.2 V diff Operatingjunctiontemperature,T –40 150 °C J Storagetemperature,T –55 150 °C stg (1) StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratings only,whichdonotimplyfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderRecommended OperatingConditions.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability. Copyright©2011–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLinks:TPS54527

TPS54527 SLVSAY5D–JULY2011–REVISEDAUGUST2016 www.ti.com 6.2 ESD Ratings VALUE UNIT Human-bodymodel(HBM),perANSI/ESDA/JEDECJS-001(1) ±2000 V Electrostaticdischarge V (ESD) Charged-devicemodel(CDM),perJEDECspecificationJESD22-C101(2) ±500 (1) JEDECdocumentJEP155statesthat500-VHBMallowssafemanufacturingwithastandardESDcontrolprocess. (2) JEDECdocumentJEP157statesthat250-VCDMallowssafemanufacturingwithastandardESDcontrolprocess. 6.3 Recommended Operating Conditions overoperatingfree-airtemperaturerange(unlessotherwisenoted) MIN MAX UNIT V Supplyinputvoltage 4.5 18 V IN VBST –0.1 24 VBST(10nstransient) –0.1 27 VBST(vsSW) –0.1 5.7 SS –0.1 5.7 Inputvoltage EN –0.1 18 V VFB –0.1 5.5 SW –1.8 18 SW(10nstransient) –3 21 GND –0.1 0.1 V Outputvoltage VREG5 –0.1 5.7 V OUT I Outputcurrent I 0 5 mA OUT VREG5 T Operatingfree-airtemperature –40 85 °C A T Operatingjunctiontemperature –40 150 °C J 6.4 Thermal Information TPS54527 THERMALMETRIC(1) DDA(SOPowerPAD) UNIT 8PINS R Junction-to-ambientthermalresistance 43.5 °C/W θJA R Junction-to-case(top)thermalresistance 49.4 °C/W θJC(top) R Junction-to-boardthermalresistance 25.6 °C/W θJB ψ Junction-to-topcharacterizationparameter 7.4 °C/W JT ψ Junction-to-boardcharacterizationparameter 25.5 °C/W JB R Junction-to-case(bottom)thermalresistance 5.2 °C/W θJC(bot) (1) Formoreinformationabouttraditionalandnewthermalmetrics,seetheSemiconductorandICPackageThermalMetricsapplication report. 4 SubmitDocumentationFeedback Copyright©2011–2016,TexasInstrumentsIncorporated ProductFolderLinks:TPS54527

TPS54527 www.ti.com SLVSAY5D–JULY2011–REVISEDAUGUST2016 6.5 Electrical Characteristics overoperatingfree-airtemperaturerange,V =12V(unlessotherwisenoted) IN PARAMETER TESTCONDITIONS MIN TYP MAX UNIT SUPPLYCURRENT I Operatingnon-switchingsupplycurrent VINcurrent,T =25°C,EN=5V,V =0.8V 900 1400 µA VIN A FB I Shutdownsupplycurrent VINcurrent,T =25°C,EN=0V 3.6 10 µA VINSDN A LOGICTHRESHOLD V ENhigh-levelinputvoltage EN 1.6 V ENH V ENlow-levelinputvoltage EN 0.6 V ENL VFBVOLTAGEANDDISCHARGERESISTANCE T =25°C,V =1.05V,continuousmode 757 765 773 mV A OUT VFBTH VFBthresholdvoltage TmAod=e–(41)0°Cto85°C,VOUT=1.05V,continuous 751 765 779 mV I VFBinputcurrent V =0.8V,T =25°C 0 ±0.15 µA VFB FB A VREG5OUTPUT V VREG5outputvoltage T =25°C,6V<V <18V,0<I <5mA 5.2 5.5 5.7 V REG5 A IN VREG5 V Lineregulation 6V<V <18V,I =5mA 25 mV LN5 IN VREG5 V Loadregulation 0mA<I <5mA 100 mV LD5 VREG5 I Outputcurrent V =6V,V =4V,T =25°C 60 mA VREG5 IN REG5 A MOSFET R Highsideswitchresistance T =25°C,V –SW=5.5V 65 mΩ DS(ON)H A BST R Lowsideswitchresistance T =25°C 36 mΩ DS(ON)L A CURRENTLIMIT I Currentlimit Lout=1.5µH(1) 5.6 6.4 7.9 A ocl THERMALSHUTDOWN Shutdowntemperature (1) 165 T Thermalshutdownthreshold °C SDN Hysteresis (1) 35 SOFTSTART I SSchargecurrent V =1V 4.2 6 7.8 µA SSC SS I SSdischargecurrent V =0.5V 0.1 0.2 mA SSD SS UVLO WakeupVREG5voltage 3.45 3.75 4.05 UVLO UVLOthreshold V HysteresisVREG5voltage 0.19 0.32 0.45 (1) Notproductiontested. 6.6 Timing Requirements MIN NOM MAX UNIT ON-TIMETIMERCONTROL t ONtime V =12V,V =1.05V 150 ns ON IN OUT t MinimumOFFtime T =25°C,V =0.7V 260 330 ns OFF(MIN) A FB Copyright©2011–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLinks:TPS54527

TPS54527 SLVSAY5D–JULY2011–REVISEDAUGUST2016 www.ti.com 6.7 Typical Characteristics V =12V,T =25°C(unlesotherwisenoted) IN A 1200 7 6 1000 V = 12 V IN A m Am nt - 5 nt - 800 urre VIN= 12 V e C 4 ply Curr 600 utdown 3 p h u S - SC 400 dn - 2 IC ccs v 200 I 1 0 0 -50 0 50 100 150 -50 0 50 100 150 TJ- Junction Temperature- °C TJ- Junction Temperature- °C Figure2.VINShutdownCurrentvsJunctionTemperature Figure1.VINCurrentvsJunctionTemperature 50 0.78 V = 18 V IN 45 0.775 40 N - Input Current -Am 1223350505 V- Vfb Voltage - VFBTH 0.007..677567 E 10 0.755 5 0.75 0 -50 0 50 100 150 0 5 10 15 20 EN - Input Voltage - V TJ- Junction Temperature- °C Figure4.VFBVoltagevsJunctionTemperature Figure3.ENCurrentvsENVoltage 1.07 1.07 VIN= 18 V VIN= 12 V VIN= 5 V IO= 0A 1.06 1.06 V V ut Voltage - 1.05 ut Voltage - 1.05 IO= 1A p p ut ut O O - - O O V V 1.04 1.04 1.03 1.03 0 1 2 3 4 5 0 5 10 15 20 IO- Output Current -A VI- Input Voltage - V Figure5.1.05-VOutputVoltagevsOutputCurrent Figure6.1.05-VOutputVoltagevsInputVoltage 6 SubmitDocumentationFeedback Copyright©2011–2016,TexasInstrumentsIncorporated ProductFolderLinks:TPS54527

TPS54527 www.ti.com SLVSAY5D–JULY2011–REVISEDAUGUST2016 Typical Characteristics (continued) V =12V,T =25°C(unlesotherwisenoted) IN A 100 900 VO= 3.3 V 850 IO= 1A 90 Hz 800 VO= 5 VVO= 3.3 V VO= 2.5 V k 80 y - 750 c Efficiency - % 70 VO= 2.5 V VO= 1.8 V ching Frequen 667050000 VO= 1.05 V VO= 1.2 V 60 Swit 550 VO= 1.5 V w - VO= 1.8 V s 500 50 f 450 40 400 0 1 2 3 4 5 0 5 10 15 20 IO- Output Current -A VI- Input Voltage - V Figure7.EfficiencyvsOutputCurrent Figure8.SwitchingFrequencyvsInputVoltage 900 850 kHz 800 VO= 3.3 V VO= 1.8 V VO= 1.05 V y - 750 c n e 700 u q e Fr 650 g n hi 600 c Swit 550 w - s 500 f 450 400 0 1 2 3 4 5 IO- Output Current -A Figure9.SwitchingFrequencyvsOutputCurrent Copyright©2011–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLinks:TPS54527

TPS54527 SLVSAY5D–JULY2011–REVISEDAUGUST2016 www.ti.com 7 Detailed Description 7.1 Overview The TPS54527 is a 5-A synchronous step-down (buck) converter with two integrated N-channel MOSFETs. It operates using D-CAP2 mode control. The fast transient response of D-CAP2 control reduces the output capacitance required to meet a specific level of performance. Proprietary internal circuitry allows the use of low ESRoutputcapacitorsincludingceramicandspecialpolymertypes. 7.2 Functional Block Diagram EN 1 EN VIN Logic VIN 8 VREG5 VBST Control Logic 7 Ref + SS +PWM VFB 1 shot SW VO 2 - 6 XCON ON VREG5 VREG5 Ceramic 3 Capacitor SGND SS SS 5 4 Softstart GND PGND SGND + SW OCP - PGND VIN VREG5 UVLO Protection TSD Logic UVLO REF Ref Copyright © 2016,Texas Instruments Incorporated 7.3 Feature Description 7.3.1 SoftStartandPre-BiasedSoftStart The soft start function is adjustable. When the EN pin becomes high, 6-µA current begins charging the capacitor which is connected from the SS pin to GND. Smooth control of the output voltage is maintained during start up. The equation for the slow start time is shown in Equation 1. VFB voltage is 0.765 V and SS pin source current is 6-µA. C6(nF) ´ V ´ 1.1 C6(nF) ´ 0.765 ´ 1.1 t (ms)= FB = SS I (μA) 6 SS (1) 8 SubmitDocumentationFeedback Copyright©2011–2016,TexasInstrumentsIncorporated ProductFolderLinks:TPS54527

TPS54527 www.ti.com SLVSAY5D–JULY2011–REVISEDAUGUST2016 Feature Description (continued) The TPS54527 contains a unique circuit to prevent current from being pulled from the output during startup if the output is pre-biased. When the soft-start commands a voltage higher than the pre-bias level (internal soft start becomes greater than feedback voltage V ), the controller slowly activates synchronous rectification by starting FB the first low side FET gate driver pulses with a narrow on-time. It then increments that on-time on a cycle-by- cycle basis until it coincides with the time dictated by 1 – D, where D is the duty cycle of the converter. This scheme prevents the initial sinking of the pre-bias output, and ensure that the output voltage (V ) starts and OUT ramps up smoothly into regulation and the control loop is given time to transition from pre-biased start-up to normalmodeoperation. 7.3.2 CurrentProtection The output overcurrent protection (OCP) is implemented using a cycle-by-cycle valley detect control circuit. The switch current is monitored by measuring the low-side FET switch voltage between the SW pin and GND. This voltage is proportional to the switch current. To improve accuracy, the voltage sensing is temperature compensated. During the on time of the high-side FET switch, the switch current increases at a linear rate determined by V , IN V , the on-time and the output inductor value. During the on time of the low-side FET switch, this current OUT decreases linearly. The average value of the switch current is the load current (I ). The TPS54527 constantly OUT monitorsthelow-sideFETswitchvoltage,whichisproportionaltotheswitchcurrent,duringthelow-sideon-time. If the measured voltage is above the voltage proportional to the current limit, an internal counter is incremented per each SW cycle and the converter maintains the low-side switch on until the measured voltage is below the voltage corresponding to the current limit at which time the switching cycle is terminated and a new switching cycle begins. In subsequent switching cycles, the on-time is set to a fixed value and the current is monitored in the same manner. If the over current condition exists for 7 consecutive switching cycles, the internal OCL threshold is set to a lower level, reducing the available output current. When a switching cycle occurs where the switch current is not above the lower OCL threshold, the counter is reset and the OCL limit is returned to the highervalue. There are some important considerations for this type of over-current protection. The peak current is the average load current plus one half of the peak-to-peak inductor current. The valley current is the average load current minus one half of the peak-to-peak inductor current. Because the valley current is used to detect the overcurrent threshold, the load current is higher than the over-current threshold. Also, when the current is being limited, the output voltage tends to fall as the demanded load current may be higher than the current available from the converter. When the over current condition is removed, the output voltage returns to the regulated value. This protectionisnon-latching. 7.3.3 UVLOProtection Undervoltage lockout protection (UVLO) monitors the voltage of the VREG5 pin. When the VREG5 voltage is lowerthanUVLOthresholdvoltage,theTPS54527isshutoff.Thisprotectionisnon-latching. 7.3.4 ThermalShutdown TPS54527 monitors the temperature of itself. If the temperature exceeds the threshold value (typically 165°C), thedeviceisshutoff.Thisisnon-latchprotection. 7.4 Device Functional Modes 7.4.1 PWMOperation The main control loop of the TPS54527 is an adaptive on-time pulse width modulation (PWM) controller that supports a proprietary D-CAP2 mode control. D-CAP2 mode control combines constant on-time control with an internal compensation circuit for pseudo-fixed frequency and low external component count configuration with bothlowESRandceramicoutputcapacitors.Itisstableevenwithvirtuallynorippleattheoutput. Copyright©2011–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLinks:TPS54527

TPS54527 SLVSAY5D–JULY2011–REVISEDAUGUST2016 www.ti.com Device Functional Modes (continued) At the beginning of each cycle, the high-side MOSFET is turned on. This MOSFET is turned off after internal one shot timer expires. This one shot is set by the converter input voltage (V ) and the output voltage (V ) to IN OUT maintain a pseudo-fixed frequency over the input voltage range, hence it is called adaptive on-time control. The one-shot timer is reset and the high-side MOSFET is turned on again when the feedback voltage falls below the reference voltage. An internal ramp is added to reference voltage to simulate output ripple, eliminating the need forESRinducedoutputripplefromD-CAP2modecontrol. 7.4.2 PWMFrequencyandAdaptiveOn-TimeControl TPS54527 uses an adaptive on-time control scheme and does not have a dedicated on board oscillator. The TPS54527 runs with a pseudo-constant frequency of 650 kHz by using the input voltage and output voltage to set the on-time one-shot timer. The on-time is inversely proportional to the input voltage and proportional to the outputvoltage,therefore,whenthedutyratioisV /V ,thefrequencyisconstant. OUT IN 10 SubmitDocumentationFeedback Copyright©2011–2016,TexasInstrumentsIncorporated ProductFolderLinks:TPS54527

TPS54527 www.ti.com SLVSAY5D–JULY2011–REVISEDAUGUST2016 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validateandtesttheirdesignimplementationtoconfirmsystemfunctionality. 8.1 Application Information The TPS54327 is designed to provide up to a 2-A output current from an input voltage source ranging from 4.5 V to18V.Theoutputvoltageisconfiguarablefrom0.7Vto6V. 8.2 Typical Application U1 TPS54527 Copyright © 2016,Texas Instruments Incorporated Figure10. Showstheschematicdiagramforthisdesignexample. 8.2.1 DesignRequirements Forthisdesignexample,usetheparameterslistedinTable1astheinputparameters. Table1.DesignParameters PARAMETER EXAMPLEVALUE Inputvoltage 4.5Vto18V Outputvoltage 1.05V Outputcurrent 5A Outputvoltageripple 20mV Inputvoltageripple 100mV Copyright©2011–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 11 ProductFolderLinks:TPS54527

TPS54527 SLVSAY5D–JULY2011–REVISEDAUGUST2016 www.ti.com 8.2.2 DetailedDesignProcedure 8.2.2.1 OutputVoltageResistorsSelection The output voltage is set with a resistor divider from the output node to the VFB pin. TI recommends using a 1% toleranceorbetterdividerresistors.StartbyusingEquation2tocalculateV . OUT To improve efficiency at very light loads consider using larger value resistors, too high of resistance is more susceptibletonoiseandvoltageerrorsfromtheVFBinputcurrentismorenoticeable. æ R1ö VOUT =0.765x çççè1+ R2÷÷÷÷ø (2) 8.2.2.2 OutputFilterSelection TheoutputfilterusedwiththeTPS54527isanLCcircuit.ThisLCfilterhasadoublepoleat: 1 F = P 2p L xC OUT OUT (3) At low frequencies, the overall loop gain is set by the output set-point resistor divider network and the internal gain of the TPS54527. The low frequency phase is 180 degrees. At the output filter pole frequency, the gain rolls off at a –40 dB per decade rate and the phase drops rapidly. D-CAP2 introduces a high frequency zero that reduces the gain roll off to –20 dB per decade and increases the phase to 90 degrees one decade above the zero frequency. The inductor and capacitor selected for the output filter must be selected so that the double pole of Equation 3 is located below the high frequency zero but close enough that the phase boost provided be the highfrequencyzeroprovidesadequatephasemarginforastablecircuit.TIrecommendsthevaluesinTable2 to meetthisrequirement. Table2.RecommendedComponentValues OUTPUTVOLTAGE(V) R1(kΩ) R2(kΩ) C4(pF)(1) L1(µH) C8+C9(µF) 1 6.81 22.1 — 1to1.5 22to68 1.05 8.25 22.1 — 1to1.5 22to68 1.2 12.7 22.1 — 1to1.5 22to68 1.5 21.5 22.1 — 1.5 22to68 1.8 30.1 22.1 5to22 1.5 22to68 2.5 49.9 22.1 5to22 2.2 22to68 3.3 73.2 22.1 5to22 2.2 22to68 5 124 22.1 5to22 3.3 22to68 (1) Optional Because the DC gain is dependent on the output voltage, the required inductor value increases as the output voltage increases. For higher output voltages at or above 1.8 V, additional phase boost can be achieved by addingafeedforwardcapacitor(C4)inparallelwithR1 The inductor peak-to-peak ripple current, peak current and RMS current are calculated using Equation 4, Equation 5, and Equation 6. The inductor saturation current rating must be greater than the calculated peak current and the RMS or heating current rating must be greater than the calculated RMS current. Use 700 kHz for f . SW Use 650 kHz for f . Chose an inductor that is rated for the peak current of Equation 5 and the RMS current of SW Equation6. I = VOUT x VIN(max) -VOUT IPP V L x f IN(max) O SW (4) I lpp I =I + Ipeak O 2 (5) 1 I = I 2 + I 2 Lo(RMS) O 12 IPP (6) 12 SubmitDocumentationFeedback Copyright©2011–2016,TexasInstrumentsIncorporated ProductFolderLinks:TPS54527

TPS54527 www.ti.com SLVSAY5D–JULY2011–REVISEDAUGUST2016 For this design example, the calculated peak current is 5.51 A and the calculated RMS current is 5.01 A. The inductor used is a TDK SPM6530-1R5M100 with a peak current rating of 11.5 A and an RMS current rating of 11A. The capacitor value and ESR determines the amount of output voltage ripple. The TPS54527 is intended for use with ceramic or other low ESR capacitors. Recommended values range from 22 µF to 68 µF. Use Equation 7 to determinetherequiredRMScurrentratingfortheoutputcapacitor. V x(V -V ) I = OUT IN OUT Co(RMS) 12 xV xL x f IN O SW (7) For this design two TDK C3216X5R0J226M 22-µF output capacitors are used. The typical ESR is 2 mΩ each. ThecalculatedRMScurrentis0.29Aandeachoutputcapacitorisratedfor4A. 8.2.2.3 InputCapacitorSelection The TPS54527 requires an input decoupling capacitor and a bulk capacitor is required depending on the application. TI recommends a ceramic capacitor over 10 µF for the decoupling capacitor. An additional 0.1-µF capacitor (C3) from VIN to ground is optional to provide additional high frequency filtering. The capacitor voltage ratingmusttobegreaterthanthemaximuminputvoltage. 8.2.2.4 BootstrapCapacitorSelection A 0.1-µF ceramic capacitor must be connected between the VBST and SW pins for proper operation. TI recommendsusingaceramiccapacitor. 8.2.2.5 VREG5CapacitorSelection A 1-µF. ceramic capacitor must be connected between the VREG5 and GND pins for proper operation. TI recommendsusingaceramiccapacitor. 8.2.3 ApplicationCurves EN (10 V/div) Vout (50 mV/div) VREG5 (5 V/div) Iout (2A/div) Vout (0.5 V/div) t - Time - 100ms/div t - Time - 1 ms/div Figure11.1.05-V,50-mAto2-ALoadTransientResponse Figure12.Start-UpWaveForm Copyright©2011–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 13 ProductFolderLinks:TPS54527

TPS54527 SLVSAY5D–JULY2011–REVISEDAUGUST2016 www.ti.com Vo = 1.05 V VIN (50 mV/div) Vo = 1.05 V Vo (10 mV/div) SW (5 V/div) SW (5 V/div) t - Time - 400 ns/div t - Time - 400 ns/div IOUT=2A IOUT=2A Figure13.VoltageRippleatOutput Figure14.VoltageRippleatInput 9 Power Supply Recommendations The input voltage range is from 4.5 V to 18 V. The input power supply and the input capacitors must be placed asclosetothedeviceaspossibletominimizetheimpedanceofthepower-supplyline. 10 Layout 10.1 Layout Guidelines 1. The TPS54527 can supply large load currents up to 5 A, so heat dissipation may be a concern. The top side areaadjacenttotheTPS54527mustbefilledwithgroundasmuchaspossibletodissipateheat. 2. The bottom side area directly below the IC must a dedicated ground area. It must be directly connected to thethermalpadofthedeviceusingviasasshown.Thegroundareamustbeaslargeaspractical.Additional internallayerscanbededicatedasgroundplanesandconnectedtotheviasaswell. 3. Keeptheinputswitchingcurrentloopassmallaspossible. 4. Keep the SW node as physically small and short as possible to minimize parasitic capacitance and inductance and to minimize radiated emissions. Kelvin connections must be brought from the output to the feedbackpinofthedevice. 5. Keepanalogandnon-switchingcomponentsawayfromswitchingcomponents. 6. Makeasinglepointconnectionfromthesignalgroundtopowerground. 7. Donotallowswitchingcurrenttoflowunderthedevice. 8. KeepthepatternlinesforVINandPGNDbroad. 9. ExposedpadofdevicemustbeconnectedtoPGNDwithsolder. 10. VREG5capacitormustbeplacednearthedevice,andconnectedPGND. 11. OutputcapacitormustbeconnectedtoabroadpatternofthePGND. 12. Voltagefeedbackloopmustbeasshortaspossible,andpreferablywithgroundshield. 13. LowerresistorofthevoltagedividerwhichisconnectedtotheVFBpinmustbetiedtoSGND. 14. ProvidingsufficientviaisrequiredforVIN,SWandPGNDconnection. 15. PCBpatternforVIN,SW,andPGNDmustbeasbroadaspossible. 16. VINcapacitormustbeplacedasnearaspossibletothedevice. 14 SubmitDocumentationFeedback Copyright©2011–2016,TexasInstrumentsIncorporated ProductFolderLinks:TPS54527

TPS54527 www.ti.com SLVSAY5D–JULY2011–REVISEDAUGUST2016 10.2 Layout Example VIN VIN INPUT BYPASS CAPACITOR VIN HIGH FREQENCY BYPASS CAPACITOR TO ENABLE EN VIN CONTROL BOOST FEEDBACK VFB VBST CAPACITOR RESISTORS VREG5 SW OUTPUT VOUT BCIAAPS SS GND INDUCTOR SLOW START CAP EXPOSED THERMALPAD AREA OUTPUT Connection to POWER GROUND FILTER on internal or CAPACITOR bottom layer ANALOG GROUND TRACE POWER GROUND VIAto Ground Plane Figure15. PCBLayout 10.3 Thermal Consideration This 8-pin DDA package incorporates an exposed thermal pad that is designed to be directly to an external heat sink.Thethermalpadmustbesoldereddirectlytotheprintedboard(PCB).Aftersoldering,thePCBcanbeused as a heat sink. In addition, through the use of thermal vias, the thermal pad can be attached directly to the appropriate copper plane shown in the electrical schematic for the device, or alternatively, can be attached to a special heat sink structure designed into the PCB. This design optimizes the heat transfer from the integrated circuit(IC). For additional information on the exposed thermal pad and how to use the advantage of its heat dissipating abilities,seePowerPADThermallyEnhancedPackage andPowerPADMadeEasy. TheexposedthermalpaddimensionsforthispackageareshowninFigure16. Figure16. ThermalPadDimensions(TopView) Copyright©2011–2016,TexasInstrumentsIncorporated SubmitDocumentationFeedback 15 ProductFolderLinks:TPS54527

TPS54527 SLVSAY5D–JULY2011–REVISEDAUGUST2016 www.ti.com 11 Device and Documentation Support 11.1 Documentation Support 11.1.1 RelatedDocumentation Forrelateddocumentationseethefollowing: • PowerPADThermallyEnhancedPackage (SLMA002) • PowerPADMadeEasy(SLMA004) 11.2 Receiving Notification of Documentation Updates To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed.Forchangedetails,reviewtherevisionhistoryincludedinanyreviseddocument. 11.3 Community Resources The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. TIE2E™OnlineCommunity TI'sEngineer-to-Engineer(E2E)Community.Createdtofostercollaboration amongengineers.Ate2e.ti.com,youcanaskquestions,shareknowledge,exploreideasandhelp solveproblemswithfellowengineers. DesignSupport TI'sDesignSupport QuicklyfindhelpfulE2Eforumsalongwithdesignsupporttoolsand contactinformationfortechnicalsupport. 11.4 Trademarks D-CAP2,E2EaretrademarksofTexasInstruments. Blu-rayDiscisatrademarkofBlu-rayDiscAssociation. Allothertrademarksarethepropertyoftheirrespectiveowners. 11.5 Electrostatic Discharge Caution Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates. 11.6 Glossary SLYZ022—TIGlossary. Thisglossarylistsandexplainsterms,acronyms,anddefinitions. 12 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of thisdocument.Forbrowser-basedversionsofthisdatasheet,refertotheleft-handnavigation. 16 SubmitDocumentationFeedback Copyright©2011–2016,TexasInstrumentsIncorporated ProductFolderLinks:TPS54527

PACKAGE OPTION ADDENDUM www.ti.com 6-Feb-2020 PACKAGING INFORMATION Orderable Device Status Package Type Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Device Marking Samples (1) Drawing Qty (2) (6) (3) (4/5) TPS54527DDA ACTIVE SO PowerPAD DDA 8 75 Green (RoHS NIPDAU | SN Level-2-260C-1 YEAR -40 to 85 54527 & no Sb/Br) TPS54527DDAR ACTIVE SO PowerPAD DDA 8 2500 Green (RoHS NIPDAU | SN Level-2-260C-1 YEAR -40 to 85 54527 & no Sb/Br) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement. (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 1

PACKAGE OPTION ADDENDUM www.ti.com 6-Feb-2020 Addendum-Page 2

PACKAGE MATERIALS INFORMATION www.ti.com 17-Jul-2020 TAPE AND REEL INFORMATION *Alldimensionsarenominal Device Package Package Pins SPQ Reel Reel A0 B0 K0 P1 W Pin1 Type Drawing Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant (mm) W1(mm) TPS54527DDAR SO DDA 8 2500 330.0 12.8 6.4 5.2 2.1 8.0 12.0 Q1 Power PAD PackMaterials-Page1

PACKAGE MATERIALS INFORMATION www.ti.com 17-Jul-2020 *Alldimensionsarenominal Device PackageType PackageDrawing Pins SPQ Length(mm) Width(mm) Height(mm) TPS54527DDAR SOPowerPAD DDA 8 2500 366.0 364.0 50.0 PackMaterials-Page2

GENERIC PACKAGE VIEW DDA 8 PowerPAD TM SOIC - 1.7 mm max height PLASTIC SMALL OUTLINE Images above are just a representation of the package family, actual package may vary. Refer to the product data sheet for package details. 4202561/G

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