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SLVA342A TI | Alldatasheet

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SLVA342A –June 2009–RevisedMay 2010 Simple Power SolutionUsing LDOs ABSTRACT This reference design helps those desiringto design-inthe TMS320C6742, TMS320C6746, TMS320C6748, and OMAP-L138. Thisdesign,employingsequenced power supplies,describesa system withan inputvoltageof3.3V,and uses LDOs fora small,simplesystem. Sequenced power supplyarchitecturesare becoming commonplace inhigh-performancemicroprocessor and digitalsignalprocessor(DSP) systems.To save power and increaseprocessingspeeds,processor coreshave smallergeometrycellsand requirelowersupplyvoltagesthanthesystem bus voltages.Power management inthesesystems requiresspecialattention.Thisapplicationreportaddressesthesetopics and suggestssolutionsforoutputvoltagesequencing.

1 Introduction

Indualvoltagearchitectures,coordinatedmanagement ofpower suppliesisnecessarytoavoidpotential problemsand ensurereliableperformance.Power supplydesignersmust considerthetimingand voltage differencesbetween coreand I/Ovoltagesuppliesduringpower-upand power-down operations. Sequencingreferstotheorder,timingand differentialinwhichthetwo voltagerailsarepowered up and down. A systemdesignedwithoutpropersequencingmay be atriskfortwo typesoffailures.The firstof theserepresentsa threattothelongtermreliabilityofthedualvoltagedevice,whilethesecond ismore immediate,withthepossibilityofdamaging interfacecircuitsintheprocessororsystemdevicessuch as memory, logicordataconverterICs Anotherpotentialproblemwithimpropersupplysequencingisbus contention.Bus contentionisa conditionwhen theprocessorand anotherdevicebothattempttocontrola bidirectionalbus duringpower up.Bus contentionalsomay affectI/Oreliability.Power supplydesignersmust checktherequirements regardingbus contentionforindividualdevices. The power-onsequencingfortheOMAP-L138, TMS320C6742, TMS320C6746, and TMS320C6748 are shown inTable1.No specificvoltageramp rateisrequiredforany ofthesuppliesas longas the3.3-Vrail neverexceedsthe1.8-Vrailby more than2 volts.

2 Power Requirements

The power requirementsareas specifiedinthefollowingtable. Table1.Power Requirements VOLTAGE (1)(2) Imax SEQUENCING TIMINGPIN NAME TOLERANCE(V) (mA) ORDER DELAY I/O RTC_CVDD 1.2 1 –25%, +10% 1(3) I/O RVDD, PLL0_VDDA, 1.2 200 –5%, +10% 3 PLL1_VDDA, SATA_VDD, USB_CVDD, USB0_VDDA12 I/O USB0_VDDA18, USB1_VDDA18, 1.8 180 ±5% 4 DDR_DVDD18, SATA_VDDR, DVDD18 I/O USB0_VDDA33, USB1_VDDA33 3.3 24 ±5% 5 DVDD3318_C (1) If1.8-VLVCMOS isused,power railsup withthe1.8-Vrails.If3.3-VLVCMOS isused,power itup withtheANALOG33 rails (VDDA33_USB0/1) (2) No specificvoltageramp rateisrequiredforany ofthesuppliesas longasa LVCMOS33 (USB0_VDDA33, USB1_VDDA33) neverexceedsSTATIC18 (USB0_VDDA18, USB1_VDDA18, DDR_DVDD18, SATA_VDDR, DVDD18) by more than2 volts. (3) IfRTC isnotused/maintainedon a separatesupply,itcan be includedintheSTATIC12 (fixed1.2V) group. (4) IfusingCVDD atfixed1.2V,all1.2-Vrailsmay be combined. (5) IfDVDD3318_A, B,and C arepowered independently,maximum power foreach railis1/3theabove maximum power.

2 SimplePower SolutionUsingLDOs SLVA342A –June 2009–RevisedMay 2010

www.ti.com Features

3 Features

The designuses theLDOs. INPUT VOLTAGE ~3.3V Simple (no DVFS) COMBINE RTC AND STATIC 1.2 Core 1.2V at600 mA TPS74801 Static1.2V + VRTC at251 mA TPS74701 Static1.8V at230 mA TPS71718 Static3.3V at115 mA TPS74801 Here VRTC isincludedintheSTATIC12 (fixed1.2V)group. TPS74801 and TPS74701

VOUT Range: 0.8V to3.6V
2% AccuracyOver Line/Load/Temperature
Programmable Soft-StartProvidesLinearVoltageStartup
StablewithAny OutputCapacitor≥ 2.2mF
Availableina Small3-mm × 3-mm × 1-mm SON-10 and 5 × 5 QFN-20 Packages TPS71718
150-mA Low-DropoutRegulatorwithEnable
Low Noise:30 mV typical(100Hz to100 kHz)
ExcellentLoad/LineTransientResponse
SmallSC70-5,2-mm × 2-mm SON-6, and 1,5-mm × 1,5-mm SON-6 Packages More informationon thedevicescan be foundfromthedatasheets.
TPS74801, http://focus.ti.com/lit/ds/symlink/tps74801.pdf
TPS74701, http://focus.ti.com/lit/ds/symlink/tps74701.pdf
TPS71718, http://focus.ti.com/lit/ds/symlink/tps71718.pdf 3SLVA342A –June 2009–RevisedMay 2010 SimplePower SolutionUsingLDOs Copyright© 2009–2010,Texas InstrumentsIncorporated

Features www.ti.com Figure1.PMP4980 ReferenceDesign Schematic Propersequencingisensuredinthedesignwiththeuse ofenablepins.As required,Core 1.2V at600 mA comes first,followedby Static1.2V + VRTC at251 mA, Static1.8V at230 mA whichinturnenable theLDO and hence atlastStatic3.3V at115 mA comes up.

4 SimplePower SolutionUsingLDOs SLVA342A –June 2009–RevisedMay 2010

www.ti.com Features (1) Use threesuch LDOs topower up DVDDA, DVDDB, DVDDC (Itcan eitherbe 1.8V or3.3V) (2) Rx = 0.499M Ω,Ry = 1 M Ω forVout= 1.8V (3) Rx = 1.8M Ω,Ry = 1 M Ω forVout= 3.3V (4) Forpropersequencingofoutput,enableoftheLDOs arefedeitherfrom1.2-VoutputfromTPS74701 if DVDDX is1.8V orfrom1.8-VoutputfromTPS71718 ifDVDDX is3.3V. Figure2.OptionalCircuitforDVDD_A, DVDD_B, and DVDD_C 5SLVA342A –June 2009–RevisedMay 2010 SimplePower SolutionUsingLDOs Copyright© 2009–2010,Texas InstrumentsIncorporated

ListofMaterial www.ti.com

4 ListofMaterial

Table2.PMP4980 ListofMaterial Count RefDes Value Description Size PartNumber MFR Area 1 C1 1.0uF Capacitor,Ceramic,25V,X5R, 10% 0603 C1608X5R1E105K TDK 5650 2 C2 4.7uF Capacitor,Ceramic,6.3V,X5R, 10% 0603 C1608X5R0J106M TDK 5650 2 C3 4.7uF Capacitor,Ceramic,6.3V,X5R, 10% 0603 C1608X5R0J475K TDK 5650 3 C4 4.7uF Capacitor,Ceramic,4.7uF,6.3V,X5R 0603 C1608X5R0J475M TDK 5650

1 C5 1uF Capacitor,Ceramic,1uF,16V,X5R 0603 C1608X5R1C105K TDK 5650

C6 4.7uF Capacitor,Ceramic,4.7uF,6.3V,X5R 0603 C1608X5R0J475M TDK 5650 C7 4.7uF Capacitor,Ceramic,4.7uF,6.3V,X5R 0603 C1608X5R0J475M TDK 5650

1 C8 1nF Capacitor,Ceramic,1000pF,50V,X7R, 10% 0603 C1608X7R1H102K TDK 5650

2 C9 1uF Capacitor,Ceramic,6.3V,X5R, 20% 0603 C1608X5R1E105M TDK 5650 C10 1uF Capacitor,Ceramic,6.3V,X5R, 20% 0603 C1608X5R1E105M TDK 5650 1 C11 0.01uF Capacitor,Ceramic,50V,COG, 10% 0402 Std Std 2800 1 C12 1.0uF Capacitor,Ceramic,25V,X5R, 10% 0603 C1608X5R1E105K TDK 5650 C13 4.7uF Capacitor,Ceramic,6.3V,X5R, 10% 0603 C1608X5R0J106M TDK 5650 C14 4.7uF Capacitor,Ceramic,6.3V,X5R, 10% 0603 C1608X5R0J475K TDK 5650 1 J1 PEC36SAAN Header,Male 5-pin,100milspacing,(36-pinstrip) 0.100inch× 5 PEC36SAAN Sullins 60000 1 R1 2.49k Resistor,Chip,1/16W,1% 0603 Std Std 5650 1 R2 4.99k Resistor,Chip,1/16W,1% 0603 Std Std 5650 2 R3 10.0k Resistor,Chip,1/16W,1% 0603 Std Std 5650

1 R4 10k Resistor,Chip,10k-Ohms 1/16W,5% 0603 Std Std 5,650

1 R5 2.49k Resistor,Chip,2k49-Ohms, 1/16W,5% 0603 Std Std 5,650 1 R6 4.99k Resistor,Chip,4k99-Ohms, 1/16W,5% 0603 Std Std 5,650 1 R7 3.57k Resistor,Chip,1/16W,1% 0603 Std Std 5650 1 R8 1.15k Resistor,Chip,1/16W,1% 0603 Std Std 5650 R9 10.0k Resistor,Chip,1/16W,1% 0603 Std Std 5650 2 TP1 5000 TestPoint,Red, ThruHoleColorKeyed 0.100× 0.100 5000 Keyston 10 e TP2 5000 TestPoint,Red, ThruHoleColorKeyed 0.100× 0.100 5000 Keyston 10 e 1 TP3 5001 TestPoint,Black,ThruHoleColorKeyed 0.100× 0.100inch 5001 Keyston 10 e 2 U1 TPS74801DRC IC,1.5ALDO RegulatorwithSoft-Start SON-10 TPS74801DRC TI 30400 1 U2 TPS74701DRC IC,1.5ALDO RegulatorwithSoft-Start SON-10 TPS74701DRC TI 30400

1 U3 TPS71718 IC,150mA, Low Iq,Wide Bandwidth,LDO Linear SC70 TPS71718 TI 18600

U4 TPS74801DRC IC,1.5ALDO RegulatorwithSoft-Start SON-10 TPS74801DRC TI 30400 Notes:1. These assembliesareESD sensitive,ESD precautionsshallbe observed. 2. These assembliesmust be cleanand freefromfluxand allcontaminants. Use ofuncleanfluxisunacceptable. 3. These assembliesmust complywithworkmanshipstandardsIPC-A-610Class2. 4. Ref designatorsmarked withan asterisk('**')cannotbe substituted. Allothercomponents can be substitutedwithequivalentMFG 's components.

6 SimplePower SolutionUsingLDOs SLVA342A –June 2009–RevisedMay 2010

www.ti.com ListofMaterial

4.1 TestResults

The start-upwaveform isshown inFigure3,whichspecifiesthesequencingorderthatisrequired. Figure3.Sequencing inStart-UpWaveform 7SLVA342A –June 2009–RevisedMay 2010 SimplePower SolutionUsingLDOs Copyright© 2009–2010,Texas InstrumentsIncorporated

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Simple Power Solution Using LDOs

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