Shindengen MD3221N Instructions d'utilisation

SynchronousRectification

DC-DC Converter Power IC

MD3221N

ApplicationManual

CAT. No. U100 -1

SHINDENGEN ELECTRIC MFG. CO., LTD.

查询MD3221N供应商捷多邦，专业PCB打样工厂，24小时加急出货

UsingtheMD3221NDCtoDCConverterPowerIC

Thank you for purchasing the MD3221N DC to DC Converter Power IC. This manual contains important

information on the safe use of the MD3221N. Your safety is most important to our company. Please read these

instructions carefully before using this device.

CAUTION

The improper use of this device can result in serious injury or death.

Expensive damage to this and other equipment can result. Failure to observe the cautions in

this Manual can also result in minor injuries and annoying equipment damage.

The MD3221N is intended for use with general electronic equipment (office automation,

communication, measurement, household, etc.) It is not intended for use with equipment whose

failure might result in the death or injury of those depending upon it (medical treatment, air

navigation, railroad, cargo handling, nuclear power, etc.)

If you intend to use the MD3221N with other than the general equipment listed above, please consult

with our company.

Under no conditions attempt to repair or modify this device by yourself. Doing so can result in

electric shock, equipment breakage, fire, and unreliable (and dangerous) equipment operation.

Abnormal operating conditions may result in excessive voltage at the output terminal or excessive

voltage drops elsewhere in the device. Take steps to prevent load mishandling and breakage

(overvoltage and overcurrent prevention) at the final point in the equipment chain.

Overvoltage protection

The MD3221N is not equipped with an overvoltage protection function. In the event excessive

voltage appears within a module, the high input voltage may remain together with a high output

voltage even when the equipment is turned off. Smoke and flame may appear. To prevent this, be sure

to install some sort of overvoltage protection circuitry before using the equipment.

Before providing electrical power to the device, check that the polarity of the input and output

terminals is correct (check for misconnections). If circuit protection circuitry is cut off from the rest

of the equipment, smoke and flames may appear.

Be sure that input voltage level is maintained at the specified level. This may require the installation

of a voltage regulator to the input line. Voltage fluctuations may result in the appearance of smoke

and flames.

If a breakdown or other abnormal condition occurs during equipment use, immediately stop power to

the equipment. Contact our company at your earliest possible convenience.

CAUTION

■The information appearing in this Manual is the latest available at the time of publication. We reserve the right to make changes to the device

without prior notice. Therefore, your device may differ slightly from that described in this Manual.

■Every effort has been made to make the information in this Manual accurate and reliable. However, our company takes no responsibility for

injuries or damage incurred when using the device as described in this Manual. Neither do we take responsibility for damages incurred as a

result of patent or other defined rights.

■We do not give consent for a third person to use our patent or other rights based on this material. We do not guarantee these rights.

■No part of this material may be reproduced or copied without the specific written consent of our company.

■This device fully meets the reliability and quality control standards described in our company's catalog. If this device is to be used in a situation

where its misuse or failure might cause serious injury or death, consult with our company.

■Reliability and quality control standards for this device are considered adequate when it is used with the following types of end equipment.

Computer - Office automation - Communication terminal - Measurement • Machine tools - Audio-visual - Games and other amusements -

Household appliance - Personal items - Industrial robot.

Special applications where the device may or may not be suitable include the following.

Transportation and conveyance (cargo loading) equipment- Primary communications equipment - Traffic signal control equipment - Fire and

burglary alarms - Various safety devices - Medical equipment

Other special applications where the device reliability is not considered high enough include the following.

Atomic energy control systems - Aviation equipment- Aeronautics and space equipment - Ocean depth sounding equipment - Life

supportequipment

■Our company makes a constant effort to improve the quality and reliability of our products. However, it is the customer's responsibility to

provide safety. Take the appropriate steps to prevent personal injury, fire, and damage by providing redundancy equipment, fire containment

equipment, and devices to protect personnel and equipment from operational mistakes.

↓Click!

MD3221NSynchronousRectificationDC-DCConverterPowerIC

CautionsforUse....................... 1

Outline ...................................... 3

Features

ProductCode

StandardConnectionDiagram

PinLayout

PinFunctions

Specifications........................... 5

Absolutemaximumratings

RecommendedOperatingConditions

ElectricalCharacteristics

InternalBlockDiagrams

SelectionofPrimaryComponentsandPinConnections

... 7

SelectingtheOutputChokeCoil

SelectingtheOutputCondenser

SelectingtheInputCondenser

SelectingtheRegenerativeDiode

Functions................................ 10

SettingtheOutputVoltage

SelectingtheOscillationFrequency

TheSoftStartFunction

TheRemoteON/OFFFunction

TheReferenceVoltage

TheOver-currentProtectionFunction

Short-circuitProtection

TheCurrentLimitingFunction

TheOverheatProtectionFunction

ErrorAmpGainAdjustment

Bootstrap

TheLCut(cutoffdetect)Function

CautionsforPatternDesign

..... 16

PrimaryCircuitPatternDesign

ControlCircuitPatternDesign

ApplicationCircuitExamples

... 17

ComponentExamples

DimensionDrawing ................ 18

Mounting................................. 19

SubstrateMountingExample

CautionsforMounting

ExternalProtectionCircuits ... 20

ConnectionofInputProtectionDevices

ConnectionofOver-voltageProtectionCircuit

Characteristics ....................... 21

Outputvoltage:3.3V

●

EfficiencyandLossCharacteristics

●LineRegulation

●LoadRegulation

●TemperatureCharacteristics

●Start-upCharacteristics

●R/CStart-upCharacteristics

EfficiencybyOutputVoltage

●EfficiencybyOutputVoltage

EfficiencyatFrequencyof100KHz

●EfficiencyandLosses

Packaging............................... 23

TapeandReel

Packing

OrderingandDimensions

Contents

↓Click!

2Outline

TheMD3221Nisanon-insulatedDC-DCconverter

powerICincorporatingadedicatedmainswitch

MOSFETandasynchronousrectificationMOSFET.

IntegrationofacontrolICandapowerdeviceina

singlechipminimizestheeffectsofwiringand

simplifieslarge-currentpowersupplycircuitdesign.

ThePWM-controlledoutputvoltagemaybeset

overawiderangeof0.8Vto14V,and2.5V/ 3.3Vmay

besetwithouttheuseofanexternalresistor.A

widerangeofinputvoltages(4.5Vto20V)are

possible,and5Vinputandbatteryinputarealso

accommodated.Anover-currentprotectioncircuitis

incorporatedtodetectvoltagedropwiththeON

resistanceoftheinternalMOSFETandthusprovide

asimpleDC-DCconverterofhighefficiency.The

oscillationfrequencyisselectedfromthe100kHzor

300kHzsetinternally,notonlyreducingthenumber

ofexternalcomponentsrequired,butalsofacilitating

flexibledesigninapplications.Asurfacemount

S/SOP32packageisusedtoensureasmallandthin

powersupplycircuit.

◆Features

□Inputvoltagerangeof4.5Vto20V.

□

Adjustableoutputvoltagerangeof0.8Vto14V.

□InternalpowerMOSFET

□

Highefficiencyof96%(Vi=5V,Vo=3.3V,Io=1A

)

□

Over-Currentprotectionfunction(externalresistornotrequired)

□Overtemperatureprotectionfunction

□RemoteON/OFFfunction

(currentconsumptionatOFF:Typ .25μA)

□Switchingfrequencyof100kHzor300kHz

(externalC.Rnotrequired)

□TheLCut(Cutoffderect)function

□Ambienttemperaturerange:

−

30℃ to85℃

◆ProductCode

MD3221N 4072

Specificationcode

Productname

+Vi

MD3221N

Vboot

OCL+

OCL

2.5V/3.3V

ampIN

ampOUT

amp

P.GND2

GNDOSC

R/C

S/S

VCC

VDD

P.GND1

VOUT

Vref

724

11~14

832 16

4,26

+V0

18~21

Efficiencyandcircuitlosscharacteristics

5Vinput,3.3Voutput

※f=300kHz

Efficiencyη[%]

Circuitloss P [W]

Outputcurrent Io[A]

1.8

1.6

1.4

1.2

0.8

0.6

0.4

0.2

32.521.510.50

100

◆StandardConnectionDiagram

●BasicCircuit

Wiringfor3.3Voutput

↓Click!

Referto'7.SelectionofPrimaryComponentsandPinConnections'and'10.Functions'forfunctiondescriptionsandpinconnections.

VGL : 9

N/C : 10

VOUT : 11

VOUT : 12

VOUT : 13

VOUT : 14

N/C : 15

P.GND2 : 16

23 : VGH

22 : N/C

21 : VDD

20 : VDD

19 : VDD

18 : VDD

17 : N/C

R/C : 1

Vref : 2

OSC : 3

GND : 4

LC : 5

Vcc : 6

Vboot : 7

P.GND1 : 8

24 : VB

25 : OCL+

26 : GND

27 : OCL

28 : ampOUT

29 : amp

30 : ampIN

31 : 2.5V/3.3V

32 : S/S

SHINDENGEN

MD3221N



□



◆PinLayout

Pinnumber Symbol

1R/C

2Vref

3OSC

4,26 GND

Vcc

P.GND1

P.GND2

11〜14

18〜21

amp

ampIN

S/S

VOUT

VDD

Functiondescription

RemoteON / OFFcontrol

Internalreferencevoltageoutput

Oscillationfrequencyselect

ControlcircuitGND

Controlcircuitpowersupply

LowsideMOSFETdrivecircuitGND

Vboot

7LowsideMOSFETdrivecircuitpowersupply

Cut-offdetectselect

LowsideMOSFETsources

ampOUT

28 Internalerroramplifieroutput

OCL

27 Over-current

vedetectatexternalresistancedetection

Internalerroramplifierinvertedinput

Internalvoltagedetectresistoroutput

Softstartcondenserconnection

N/C10,15,17,22 Non-connection(notconnectedinternally)

2.5V / 3.3V31 2.5V / 3.3Voutputselect

Output

9VGL LowsideMOSFETgate.Pleasedonotconectthepinanywhere.

HighsideMOSFETpowersupply

OCL+Over-current+vedetectatexternalresistancedetection

24 VBHighsideMOSFETdrivecircuitpowersupply

23 VGH HighsideMOSFETgate.Pleasedonotconectthepinanywhere.



◆PinFunctions

3Specifications

◆Absolutemaximumratings

Powersupplyvoltage(voltageatV

)

22V

HighsideMOSFETinputvoltage 22V

Averageoutputcurrent 3A

Peakoutputcurrent 4A

VoltagebetweenVBandVOUT 5.5V

AllowableappliedoutputcurrentatVboot

30mA

AllowableappliedcurrentatVref

3mA

Storagetemperature

50〜150℃

Temperatureatcontacts 150℃

◆

RecommendedOperatingConditions

Inputvoltagerange 4.5〜20V

Settableoutputvoltagerange 0.8〜14V

Ambienttemperaturerange

30〜85℃

Item

Drain-sourcebreakdownvoltage

HighsideMOSFET

LowsideMOSFET

ControlICcurrentconsumption

UVLO

Bootstrap

Referencevoltage

Oscillatorcircuit

Remotecontrol

Drainbreakingcurrent

Drain-sourceONresistance

Source-draindiodeforwardvoltage

Drain-sourcebreakdownvoltage

Drainbreakingcurrent

Drain-sourceONresistance

Start-upvoltage

Stopvoltage

Start-up-stopvoltagehysteresis

Currentconsumption(atf

100kHz)

BOOTpinvoltage

Powersupplyvoltagevariation

Voltageloadvariation

Powersupplyvoltagevariation

Voltageloadvariation

Internalreferencevoltage

Internaloscillationfrequency1(f

100kHz)

Condition

1mA,VGS

VDS

22V,VGS

1.2A,VGS

4.5V

1.2A,VGS

1mA,VGS

VDS

22V,VGS

1.2A,VGS

4.5V

Vcc

4.5〜20V

Vcc

4.5〜20V

Vcc

4.5〜20V

−

Vcc

4.5〜20V

Vcc

Min.

−

4.1

3.84

−

Typ.

3.3

4.3

−

100

Max.

1.5

−

1.5

3.9

5.9

4.5

4.16

115

Vcc

5V 85 90 95

Unit

μA 

mΩ

μA

mΩ

μA

Currentconsumption(atf

300kHz)

− 3.6 3.8 4.0 V

Currentconsumption(remoteOFF)

− − 0.5 − V

RemoteONvoltage

Vcc

5V 3.84 4 4.16 V

RemoteOFFvoltage

Vcc

4.5〜20V − − 30 mV

Short-circuitcurrent

Vcc

5V − − 30 mV

Vcc

5V 255 300 345 kHz

Internaloscillationfrequency2(f

300kHz)

Maximumdutyratio(f

300kHz)

kHz

Vcc

0.2 − 0.7 V

％

Vcc

5V 2−Vcc V

Vcc

5V − 210

μA

Source-draindiodeforwardvoltage IS

1.2A,VGS

25℃unlessspecifiedotherwise.

◆ElectricalCharacteristics

↓Click!

Item

Currentatsoftstartpin

Softstart

ThresholdcurrentatONresistancedetection

Latchthresholdvoltage

Outputvoltagedetectaccuracy(setat3.3V)

Erroramp

Errorampreferencevoltage

Over-Currentprotectiondetector

Thresholdvoltageatexternalresistancedetection

Timerlatchcircuit

Timercurrent

Overtemperatureprotectiondetector

Overheatprotectionoperationtemperature

Outputvoltagedetector

Condition

Vcc

4.5〜20V

Vcc

4.5〜20V

Vcc

4.5〜20V

Min.

0.800

−

0.784

2.75

3.3

2.5

2.9

3.45

100



Typ.

0.8000.784

2.425

3.200

2.500

3.300

Max.

0.816

115

−

3.05

3.6

0.816

2.575

3.400

Unit

μA

Outputvoltagedetectaccuracy(setat0.8V)

− − 140 − ℃

Outputvoltagedetectaccuracy(setat2.5V)

VoltageatS/Spinpriortotimeroperation Vcc

R/C

(L.Active)

S/S

UVLO

INVL

※N/C : 10,15,17,22

※ (Resistance)

CURRENT

LIMIT2

CURRENT

LIMIT3

CURRENT

LIMIT1

PWM-COMP

ampIN OCL-

OCL-

2.5V/3.3V OCL+

amp-

OSC

Vref

VOUT

Vref

VDDVGH

VOUT

VBVbootVrefVcc

LC P.GND1

ampOUT

ERROR-AMP

VGL P.GND2

GND

ON/OFF

CONTROL

BANDGAP

REFERENCE

1.26V±1%

THERMAL

SHUTDOWN

VCC LATCH

Q R S

S R Q

LATCH

S R Q

LATCH

S R Q

LATCH

OSC

33130 2527

4,26

62 23

18~21

247

11~14

8916

◆InternalBlockDiagrams

●BlockDiagram

SelectionofPrimaryComponentsandPinConnections

ThecharacteristicsoftheDC-DCconverterareinfluencedbytheICitself,andalsosignificantlybythe

peripheralcomponentsofthecircuit.

Awell-designedcircuitisnecessarytomakethemostofthepotentialoftheMD3221N.Itisthereforenecessary

toclarifythespecificationsoftherequiredpowersupply,andtoselectcomponentsasfollows.

◆

SelectingtheOutputChokeCoil(inductor)(

L1)

Thechokecoilhasanimportanteffectonpower

supplyperformance.Asaripplecurrentflowsinthe

inductorasshowninthediagrambelow,the

inductanceshouldbeselectedtoensurethatΔIis

approximately30%ofthemaximumoutputcurrent

whentheinputvoltageisatitsmaximum.

●CurrentWaveforminOutputChokeCoil(L1)

Vi（max）：Maximuminputvoltage［V］

VO：Outputvoltage［V］

ΔI：30%ofmaximumoutputcurrent［A］

f：

Oscillationfrequency(100kHzor300kHz)

［Hz］

IO：Maximumoutputcurrent［A］

Theinductorisgenerallyselectedonthebasis

ofthecalculation,howeverinsomecasesthe

natureoftheproductmayrequireaninductor

which differs from the calculated value. An

inductorinwhichΔIisbetween20%and40%ofthe

outputcurrentisrecommended.

+Vi +V0

MD3221N

C1 C5

Vboot

OCL+

OCL

2.5V/3.3V

ampIN

ampOUT

amp

P.GND2

GNDOSC

R/C

S/S

VCC

VDD

P.GND1

VOUT

Vref

7 24

11~14

832 16

4,26

18~21

●StandardConnectionDiagram

（Ｖi（max）−VO）×VO

L1＝［H］

ΔI ×Ｖi

（max）×f

ΔI

↓Click!

Ifahigherinductancevalueisselectedtheoutput

ripplevoltageisreduced,howeverasthecurrentrating

dropsthesizeoftherequiredinductorisincreased.

Ontheotherhand,ifalowerinductancevalueis

selectedthesizeoftherequiredinductorisreduced

while peak current is increased, thus slightly

increasingthelosswhenaloadisapplied.

WhiletheMD3221Nincorporatesanover-current

protectionfunction,theinductorselectedmustbesuch

thatmagneticsaturationdoesnotoccurattheover-

currentdetectionpoint.

Asamagneticfieldisgeneratedinthevicinityofthe

inductor,componentlayoutandpatterndesignmust

besuchastoensurethattheydonotaffectthe

controlcircuit.Toroidalorclosedmagneticcircuitpot

typeinductorsarerecommendedforapplicationslikely

to be affected by magnetic field leakage and

radiatednoise.

◆

SelectingtheOutputCondenser(C5)

Anoutputcondenserisrequiredtoreduceoutputripple

andthusobtainastableDCvoltage.Theconverter

outputripplevoltageisdeterminedbyΔIand

condenserimpedance.Theoutputcondenseris

selectedinrelationtotheimpedance.Selecttheoutput

condenserbased on thedesiredoutput ripple

voltageusingthefollowingequation.

Zc ：Condenserimpedance［Ω］

Vrip：Outputripplevoltage［V］

ΔI：30%ofmaximumoutputcurrent［A］

Thedesiredripplevoltageisobtainedifacondenser

withanimpedancelessthanthatcalculatedwiththe

aboveequationisselectedfromthecatalog.

In addition to a low impedance, the output

condensermustalsohaveareasonablecapacitance.

Controlwillreadilybecomeunstableandampgain

adjustmentwillprovedifficultifcapacitanceislow.

Aluminumelectrolyticcondensersandfunctional

high-polymer electrolytic condensers are of

sufficientlyhighcapacitancesothatitneednotbe

consideredwhenselectingonthebasisofthe

equationabove.Theuseofsuchcondensers,rather

than ceramic or film condensers, is therefore

recommended.Ontheotherhand,concurrentuseof

ceramicorfilmcondensersiseffectiveineliminating

highfrequencynoise.

◆SelectingtheInputCondenser(C1)

Asalargeripplecurrentflowsintheinputcondenser

itisnecessarytoconsidertheallowablevalueforripple

current.Selectaninputcondenserwithanallowable

ripplecurrentexceedingthevaluecalculatedinthe

equationbelow.

Irip ：Allowableripplecurrent［A］

VO：Outputvoltage［V］

Vi ：Inputvoltage［V］

D：Dutyratio

IO：Outputcurrent［A］

DistheratiobetweentheONintervalandthe

OFFinterval,andIripisatamaximumwhenthis

value is 0.5. The capacitance of the input

condenserneednotbeparticularlyhigh,however

careisrequiredifaceramicorfilmcondenseris

used.Aslargeripplevoltagesaregeneratedinthe

inputcondenserduringcharginganddischarge,a

particularly low input voltage may result in

operation becoming unstable. As this ripple

voltageisreturnedtotheinputlineothercircuits

poweredfromthesamelinemaybeaffected.

Interferencemayoccur,particularlywhenusing

multipleDC-DCconverters,andinsuchcasesan

inductorofafewμHisinsertedinthestagebefore

theinputcondensertoeliminatetheproblem.

Vrip

ZC［Ω］

ΔI

D＝ Vi

Irip D（1−D）× IO［A］

＜

−

＞

−

Thesubstratewiringbetweentheinputcondenser

toVDD andP.GND2 issubjecttothegreatest

variationincurrent,andwiringdesignshould

thereforefocusprimarilyonreducingitsimpedance

totheabsoluteminimum.Referto'16.Cautions

forPatternDesign'fordetails.

◆

SelectingtheRegenerativeDiode(D2)

TheMD3221Nemployssynchronousrectification

usingaregenerativeMOSFET,andrequiresa

diodetobypasstheregenerativecurrentduring

thedead-timeinterval.Ifthisdiodeisnotpresent

regenerativecurrentflowsintheMOSFETbody

diodeduringthedead-timeinterval,resultingin

increasedlossesandnoise.ASchottkybarrier

diodewithlowVFisidealforuseinpreventing

currentflowinginthebodydiode,howeveritis

importantthatthisdiodehasalowleakagecurrent

topreventthermalrunaway.

Recommendedcomponent:

D1FM3(Shindengen)

30V, 3AVF=0.4V

（max） IR=0.1mA

（max）

M1FM3(Shindengen)

30V, 2.1AVF=0.4V（max） IR=0.05mA（max）

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