2024年4月17日发(作者：钱兰英)

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

TPS54340

ZHCSAC5B–OCTOBER2012–REVISEDMARCH2014

TPS5434042V输入，3.5A，降压直流-直流转换器，具有Eco-mode™

1特性

•

•

•

•

3说明

TPS54340是一款42V，3.5A，降压稳压器，此稳压

器具有一个集成的高侧MOSFET。按照ISO7637标

准，此器件能够耐受高达45V的抛负载脉冲。电流模

式控制提供了简单的外部补偿和灵活的组件选择。一

个低纹波脉冲跳跃模式将无负载时的电源电流减小至

146μA。当启用引脚被拉至低电平时，关断电源电流

被减少至1μA。

欠压闭锁在内部设定为4.3V，但可用使能引脚将之提

高。输出电压启动斜升由内部控制以提供一个受控的

启动并且消除过冲。

宽开关频率范围可实现对效率或者外部组件尺寸的优

化。频率折返和热关断在过载条件下保护内部和外部

组件。

TPS54340采用8端子散热增强型HSOIC

PowerPAD™封装。

器件信息

订货编号

TPS54340DDA

封装

HSOIC(8)

封装尺寸

4.89mmx3.9mm

•

•

•

•

•

•

•

•

•

•

•

•

•

•

输入电压范围4.5V至42V（最大绝对值45V）

3.5A持续电流，4.5A最小峰值电感器电流限值

电流模式控制直流-直流转换器

92mΩ高侧金属氧化物半导体场效应晶体管

(MOSFET)

轻负载条件下使用脉冲跳跃实现的高效率Eco-

mode™

轻负载条件下使用集成型引导(BOOT)再充电场效

应晶体管(FET)实现的低压降

146μA工作静态电流

1μA关断电流

100kHz至2.5MHz的固定开关频率

同步至外部时钟

可调欠压闭锁(UVLO)电压和滞后

内部软启动

精确逐周期电流限制

过热、过压和频率折返保护

0.8V1%内部电压基准

8端子散热增强型小外形尺寸集成电路(HSOIC)

PowerPAD™封装

-40°C至150°CT

J

运行范围

由WEBENCH™软件工具提供支持

2应用范围

12V，24V工业、汽车和通信电源系统

4简化电路原理图

效率与负载电流间的关系

V

IN

VIN

TPS54340

100

90

80

EN

RT/CLK

E

f

f

i

c

i

e

n

c

y

-

%

BOOT

SW

70

V

OUT

= 5V

V

OUT

= 3.3V

V

OUT

60

50

40

30

20

R1

COMP

FB

R3

GND

10

0

00.51.01.52.0

V

IN

= 12V

fsw = 600 kHz

2.53.03.5

I

O

- Output Current -A

tsconformtospecificationsperthetermsoftheTexas

tionprocessingdoesnotnecessarilyincludetestingofallparameters.

EnglishDataSheet:SLVSBK0

TPS54340

ZHCSAC5B–OCTOBER2012–

目录

1

2

3

4

5

6

7

特性..........................................................................

应用范围...................................................................

说明..........................................................................

简化电路原理图........................................................

修订历史记录...........................................................

.

7.1

7.2

7.3

7.4

7.5

7.6

7.7

.

.

1

1

1

1

2

3

4

4

4

4

4

5

6

6

11

11

22

24

.24

24

34

35

35

35

12器件和文档支持.....................................................36

36

36

36

.10

.10

13机械封装和可订购信息..........................................36

5修订历史记录

NOTE:Pagenumbersforpreviousrevisionsmaydifferfrompagenumbersinthecurrentversion.

ChangesfromRevisionA(February2013)toRevisionB

•

•

•

•

•

•

•

•

•

•

•

Page

已将数据表更改为全新的TI版面布局.....................................................................................................................................1

已将应用范围列表从：12V，24V和48V工业改为：12V，24V工业....................................................................................1

已添加器件信息表...................................................................................................................................................................1

4

4

4

ChangedtheOperating:nonswitchingsupplycurrentTESTCONDITIONSFrom:FB=0.83VTo:FB=5

ChangedRT/CLKhighthresholdMAXvalueFrom:1.5

ChangedFigure6titleFrom:6

ChangedFigure7titleFrom:7

34

PageChangesfromOriginal(October2012)toRevisionA

•

•

ChangedFigure11From:I

EN

(µV)To:I

EN

(µA).....................................................................................................................7

ChangedFigure12From:I

EN

(µV)To:I

EN

(µA).....................................................................................................................7

2

Copyright©2012–2014,TexasInstrumentsIncorporated

TPS54340

AC5B–OCTOBER2012–REVISEDMARCH2014

6TerminalConfigurationandFunctions

HSOICPACKAGE

(TOPVIEW)

BOOT18SW

VIN2

Thermal

Pad

9

7GND

EN36COMP

RT/CLK4

5FB

TerminalFunctions

TERMINAL

NAME

BOOT

VIN

EN

NO.

1

2

3

I/ODESCRIPTION

oltageonthiscapacitorisbelowthe

minimumrequiredtooperatethehighsideMOSFET,theoutputisswitchedoffuntilthecapacitoris

refreshed.

Inputsupplyvoltagewith4.5Vto42Voperatingrange.

Enableterminal,the

EnableandAdjustingUndervoltageLockoutsection.

rnalamplifierholdsthisterminalatafixedvoltagewhenusingan

erminalispulledabovethePLLupper

threshold,ernalamplifieris

dkingedgesstop,the

internalamplifierisre-enabledandtheoperatingmodereturnstoresistorfrequencyprogramming.

Invertinginputofthetransconductance(gm)erroramplifier.

Erroramplifieroutputandinputtotheoutputswitchcurrent(PWM)tfrequency

compensationcomponentstothisterminal.

Ground

Thesourceoftheinternalhigh-sidepowerMOSFETandswitchingnodeoftheconverter.

GNDterminalmustbeelectricallyconnectedtotheexposedpadontheprintedcircuitboardforproper

operation.

O

I

I

RT/CLK4I

FB

COMP

GND

SW

ThermalPad

5

6

7

8

9

I

O

–

I

–

Copyright©2012–2014,TexasInstrumentsIncorporated

3

TPS54340

ZHCSAC5B–OCTOBER2012–

7Specifications

7.1AbsoluteMaximumRatings

(1)

overoperatingfree-airtemperaturerange(unlessotherwisenoted)

MIN

VIN

EN

Inputvoltage

BOOT

FB

COMP

RT/CLK

BOOT-SW

Outputvoltage

Operatingjunctiontemperature

(1)

SW

SW,10-nsTransient

–0.6

–2

–40

–0.3

–0.3

–0.3

–0.3

–0.3

MAX

45

8.4

53

3

3

3.6

8

45

45

150°C

V

V

UNIT

Stressesbeyondthoselistrestressratings

onlyandfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperating

retoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.

7.2HandlingRatings

MIN

T

STG

V

ESD

(1)

(2)

(3)

(1)

MAX

150

2

500

UNIT

°C

kV

V

Storagetemperaturerange

HumanBodyModel(HBM)ESDStressVoltage

(2)

(3)

–65

ChargedDeviceModel(HBM)ESDStressVoltage

Electrostaticdischarge(ESD)tomeasuredevicesensitivityandimmunitytodamagecausedbyassemblylineelectrostaticdischarges

intothedevice.

LevellistedaboveisthepassinglevelperANSI/ESDA/ocumentJEP155statesthat500VHBMallowssafe

alslistedas1000Vmayactuallyhavehigherperformance.

ocumentJEP157statesthat250VCDMallowssafe

alslistedas250Vmayactuallyhavehigherperformance.

7.3RecommendedOperatingConditions

overoperatingfree-airtemperaturerange(unlessotherwisenoted)

MIN

V

IN

V

O

I

O

T

J

Supplyinputvoltage

Outputvoltage

Outputcurrent

JunctionTemperature

4.5

0.8

0

–40

MAX

42

41.1

5

150

UNIT

V

V

A

°C

7.4ThermalInformation

THERMALMETRIC

(1)(2)

θ

JA

ψ

JT

ψ

JB

θ

JCtop

θ

JCbot

θ

JB

(1)

(2)

Junction-to-ambientthermalresistance(standardboard)

Junction-to-topcharacterizationparameter

Junction-to-boardcharacterizationparameter

Junction-to-case(top)thermalresistance

Junction-to-case(bottom)thermalresistance

Junction-to-boardthermalresistance

TPS54340

DDA(8TERMINALS)

42.0

5.9

23.4

45.8

3.6

23.4

°C/W

UNIT

Formoreinformationabouttraditionalandnewthermalmetrics,seetheICPackageThermalMetricsapplicationreport,SPRA953.

PowerratingataspecificambienttemperatureT

A

shouldbedeterminedwithajunctiontemperatureof150°thepointwhere

erdissipationestimateinapplicationsectionofthisdatasheetformoreinformation.

4

Copyright©2012–2014,TexasInstrumentsIncorporated

TPS54340

AC5B–OCTOBER2012–REVISEDMARCH2014

7.5ElectricalCharacteristics

T

J

=–40°Cto150°C,VIN=4.5Vto42V(unlessotherwisenoted)

PARAMETER

SUPPLYVOLTAGE(VINTERMINAL)

Operatinginputvoltage

Internalundervoltagelockoutthreshold

Internalundervoltagelockoutthreshold

hysteresis

Shutdownsupplycurrent

Operating:nonswitchingsupplycurrent

ENABLEANDUVLO(ENTERMINAL)

Enablethresholdvoltage

Inputcurrent

Hysteresiscurrent

VOLTAGEREFERENCE

Voltagereference

HIGH-SIDEMOSFET

On-resistance

ERRORAMPLIFIER

Inputcurrent

Erroramplifiertransconductance(g

M

)–2μA

COMP

<2μA,V

COMP

=1V

Erroramplifiertransconductance(g

M

)during

–2μA

COMP

<2μA,V

COMP

=1V,V

FB

=0.4V

soft-start

Erroramplifierdcgain

Minunitygainbandwidth

Erroramplifiersource/sink

COMPtoSWcurrenttransconductance

CURRENTLIMIT

AllV

IN

andtemperatures,OpenLoop

(1)

Currentlimitthreshold

THERMALSHUTDOWN

Thermalshutdown

Thermalshutdownhysteresis

TIMINGRESISTORANDEXTERNALCLOCK(RT/CLKTERMINAL)

SwitchingfrequencyrangeusingRTmode

f

SW

Switchingfrequency

SwitchingfrequencyrangeusingCLKmode

RT/CLKhighthreshold

RT/CLKlowthreshold0.5

R

T

=200kΩ

100

450

160

1.55

1.2

500

2500

550

2300

2

kHz

kHz

kHz

V

V

176

12

°C

°C

Alltemperatures,VIN=12V,OpenLoop

(1)

V

IN

=12V,T

A

=25°C,OpenLoop

(1)

TESTCONDITIONSMIN

4.5

TYPMAX

42

UNIT

V

V

mV

Rising4.14.3

325

4.48

EN=0V,25°C,4.5V≤VIN≤42V

FB=0.9V,T

A

=25°C

Novoltagehysteresis,risingandfalling

Enablethreshold+50mV

Enablethreshold–50mV–0.58

–2.2

0.792

VIN=12V,BOOT-SW=6V

1.1

1.3

146

1.2

–4.6

–1.2

–3.4

0.8

92

50

350

77

10,000

2500

±30

12

4.5

4.5

5.2

5.5

5.5

5.5

3.5

175

1.3

-1.8

-4.5

0.808

190

μA

V

μA

μA

V

mΩ

nA

μMhos

μMhos

V/V

kHz

μA

A/V

V

FB

=0.8V

V

(COMP)

=1V,100mVoverdrive

6.8

6.25

5.85

A

(1)OpenLoopcurrentlimitmeasureddirectlyattheSWterminalandisindependentoftheinductorvalueandslopecompensation.

Copyright©2012–2014,TexasInstrumentsIncorporated

5

TPS54340

ZHCSAC5B–OCTOBER2012–

7.6TimingRequirements

PARAMETER

ENABLEANDUVLO(ENTERMINAL)

EnabletoCOMPactive

INTERNALSOFT-STARTTIME

Soft-StartTime

Soft-StartTime

HIGH-SIDEMOSFET

Minimumcontrollableontime

CURRENTLIMIT

Currentlimitthresholddelay

TIMINGRESISTORANDEXTERNALCLOCK(RT/CLKTERMINAL)

MinimumCLKinputpulsewidth

RT/CLKfallingedgetoSWrisingedge

delay

PLLlockintime

Measuredat500kHzwithRTresistorinseries

Measuredat500kHz

15

55

78

ns

ns

μs

60ns

VIN=12V,T

A

=25°C135ns

f

SW

=500kHz,10%to90%

f

SW

=2.5MHz,10%to90%

2.1

0.42

ms

ms

V

IN

=12V,T

A

=25°C540µs

TESTCONDITIONSMINTYPMAXUNIT

7.7TypicalCharacteristics

0.25

R

D

S

(

O

N

)

−

O

n

-

S

t

a

t

e

R

e

s

i

s

t

a

n

c

e

(

Ω

)

V

F

B

-

V

o

l

t

a

g

e

R

e

f

e

r

a

n

c

e

(

V

)

0.814

BOOT-SW = 3 V

BOOT-SW = 6 V

0.2

0.809

0.804

0.799

0.794

0.789

0.784

±50

0.15

0.1

0.05

0

−50−25

T

J

− Junction Temperature (°C)

125150

G001

±25 0 25 50 75 100 125 150

C026

V

IN

=12V

stancevsJunctionTemperature

6.5

6.3

H

i

g

h

S

i

d

e

S

w

i

t

c

h

C

u

r

r

e

n

t

(

A

)

T

J

- Junction Temperature (

2024年4月17日发(作者：钱兰英)

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

TPS54340

ZHCSAC5B–OCTOBER2012–REVISEDMARCH2014

TPS5434042V输入，3.5A，降压直流-直流转换器，具有Eco-mode™

1特性

•

•

•

•

3说明

TPS54340是一款42V，3.5A，降压稳压器，此稳压

器具有一个集成的高侧MOSFET。按照ISO7637标

准，此器件能够耐受高达45V的抛负载脉冲。电流模

式控制提供了简单的外部补偿和灵活的组件选择。一

个低纹波脉冲跳跃模式将无负载时的电源电流减小至

146μA。当启用引脚被拉至低电平时，关断电源电流

被减少至1μA。

欠压闭锁在内部设定为4.3V，但可用使能引脚将之提

高。输出电压启动斜升由内部控制以提供一个受控的

启动并且消除过冲。

宽开关频率范围可实现对效率或者外部组件尺寸的优

化。频率折返和热关断在过载条件下保护内部和外部

组件。

TPS54340采用8端子散热增强型HSOIC

PowerPAD™封装。

器件信息

订货编号

TPS54340DDA

封装

HSOIC(8)

封装尺寸

4.89mmx3.9mm

•

•

•

•

•

•

•

•

•

•

•

•

•

•

输入电压范围4.5V至42V（最大绝对值45V）

3.5A持续电流，4.5A最小峰值电感器电流限值

电流模式控制直流-直流转换器

92mΩ高侧金属氧化物半导体场效应晶体管

(MOSFET)

轻负载条件下使用脉冲跳跃实现的高效率Eco-

mode™

轻负载条件下使用集成型引导(BOOT)再充电场效

应晶体管(FET)实现的低压降

146μA工作静态电流

1μA关断电流

100kHz至2.5MHz的固定开关频率

同步至外部时钟

可调欠压闭锁(UVLO)电压和滞后

内部软启动

精确逐周期电流限制

过热、过压和频率折返保护

0.8V1%内部电压基准

8端子散热增强型小外形尺寸集成电路(HSOIC)

PowerPAD™封装

-40°C至150°CT

J

运行范围

由WEBENCH™软件工具提供支持

2应用范围

12V，24V工业、汽车和通信电源系统

4简化电路原理图

效率与负载电流间的关系

V

IN

VIN

TPS54340

100

90

80

EN

RT/CLK

E

f

f

i

c

i

e

n

c

y

-

%

BOOT

SW

70

V

OUT

= 5V

V

OUT

= 3.3V

V

OUT

60

50

40

30

20

R1

COMP

FB

R3

GND

10

0

00.51.01.52.0

V

IN

= 12V

fsw = 600 kHz

2.53.03.5

I

O

- Output Current -A

tsconformtospecificationsperthetermsoftheTexas

tionprocessingdoesnotnecessarilyincludetestingofallparameters.

EnglishDataSheet:SLVSBK0

TPS54340

ZHCSAC5B–OCTOBER2012–

目录

1

2

3

4

5

6

7

特性..........................................................................

应用范围...................................................................

说明..........................................................................

简化电路原理图........................................................

修订历史记录...........................................................

.

7.1

7.2

7.3

7.4

7.5

7.6

7.7

.

.

1

1

1

1

2

3

4

4

4

4

4

5

6

6

11

11

22

24

.24

24

34

35

35

35

12器件和文档支持.....................................................36

36

36

36

.10

.10

13机械封装和可订购信息..........................................36

5修订历史记录

NOTE:Pagenumbersforpreviousrevisionsmaydifferfrompagenumbersinthecurrentversion.

ChangesfromRevisionA(February2013)toRevisionB

•

•

•

•

•

•

•

•

•

•

•

Page

已将数据表更改为全新的TI版面布局.....................................................................................................................................1

已将应用范围列表从：12V，24V和48V工业改为：12V，24V工业....................................................................................1

已添加器件信息表...................................................................................................................................................................1

4

4

4

ChangedtheOperating:nonswitchingsupplycurrentTESTCONDITIONSFrom:FB=0.83VTo:FB=5

ChangedRT/CLKhighthresholdMAXvalueFrom:1.5

ChangedFigure6titleFrom:6

ChangedFigure7titleFrom:7

34

PageChangesfromOriginal(October2012)toRevisionA

•

•

ChangedFigure11From:I

EN

(µV)To:I

EN

(µA).....................................................................................................................7

ChangedFigure12From:I

EN

(µV)To:I

EN

(µA).....................................................................................................................7

2

Copyright©2012–2014,TexasInstrumentsIncorporated

TPS54340

AC5B–OCTOBER2012–REVISEDMARCH2014

6TerminalConfigurationandFunctions

HSOICPACKAGE

(TOPVIEW)

BOOT18SW

VIN2

Thermal

Pad

9

7GND

EN36COMP

RT/CLK4

5FB

TerminalFunctions

TERMINAL

NAME

BOOT

VIN

EN

NO.

1

2

3

I/ODESCRIPTION

oltageonthiscapacitorisbelowthe

minimumrequiredtooperatethehighsideMOSFET,theoutputisswitchedoffuntilthecapacitoris

refreshed.

Inputsupplyvoltagewith4.5Vto42Voperatingrange.

Enableterminal,the

EnableandAdjustingUndervoltageLockoutsection.

rnalamplifierholdsthisterminalatafixedvoltagewhenusingan

erminalispulledabovethePLLupper

threshold,ernalamplifieris

dkingedgesstop,the

internalamplifierisre-enabledandtheoperatingmodereturnstoresistorfrequencyprogramming.

Invertinginputofthetransconductance(gm)erroramplifier.

Erroramplifieroutputandinputtotheoutputswitchcurrent(PWM)tfrequency

compensationcomponentstothisterminal.

Ground

Thesourceoftheinternalhigh-sidepowerMOSFETandswitchingnodeoftheconverter.

GNDterminalmustbeelectricallyconnectedtotheexposedpadontheprintedcircuitboardforproper

operation.

O

I

I

RT/CLK4I

FB

COMP

GND

SW

ThermalPad

5

6

7

8

9

I

O

–

I

–

Copyright©2012–2014,TexasInstrumentsIncorporated

3

TPS54340

ZHCSAC5B–OCTOBER2012–

7Specifications

7.1AbsoluteMaximumRatings

(1)

overoperatingfree-airtemperaturerange(unlessotherwisenoted)

MIN

VIN

EN

Inputvoltage

BOOT

FB

COMP

RT/CLK

BOOT-SW

Outputvoltage

Operatingjunctiontemperature

(1)

SW

SW,10-nsTransient

–0.6

–2

–40

–0.3

–0.3

–0.3

–0.3

–0.3

MAX

45

8.4

53

3

3

3.6

8

45

45

150°C

V

V

UNIT

Stressesbeyondthoselistrestressratings

onlyandfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperating

retoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.

7.2HandlingRatings

MIN

T

STG

V

ESD

(1)

(2)

(3)

(1)

MAX

150

2

500

UNIT

°C

kV

V

Storagetemperaturerange

HumanBodyModel(HBM)ESDStressVoltage

(2)

(3)

–65

ChargedDeviceModel(HBM)ESDStressVoltage

Electrostaticdischarge(ESD)tomeasuredevicesensitivityandimmunitytodamagecausedbyassemblylineelectrostaticdischarges

intothedevice.

LevellistedaboveisthepassinglevelperANSI/ESDA/ocumentJEP155statesthat500VHBMallowssafe

alslistedas1000Vmayactuallyhavehigherperformance.

ocumentJEP157statesthat250VCDMallowssafe

alslistedas250Vmayactuallyhavehigherperformance.

7.3RecommendedOperatingConditions

overoperatingfree-airtemperaturerange(unlessotherwisenoted)

MIN

V

IN

V

O

I

O

T

J

Supplyinputvoltage

Outputvoltage

Outputcurrent

JunctionTemperature

4.5

0.8

0

–40

MAX

42

41.1

5

150

UNIT

V

V

A

°C

7.4ThermalInformation

THERMALMETRIC

(1)(2)

θ

JA

ψ

JT

ψ

JB

θ

JCtop

θ

JCbot

θ

JB

(1)

(2)

Junction-to-ambientthermalresistance(standardboard)

Junction-to-topcharacterizationparameter

Junction-to-boardcharacterizationparameter

Junction-to-case(top)thermalresistance

Junction-to-case(bottom)thermalresistance

Junction-to-boardthermalresistance

TPS54340

DDA(8TERMINALS)

42.0

5.9

23.4

45.8

3.6

23.4

°C/W

UNIT

Formoreinformationabouttraditionalandnewthermalmetrics,seetheICPackageThermalMetricsapplicationreport,SPRA953.

PowerratingataspecificambienttemperatureT

A

shouldbedeterminedwithajunctiontemperatureof150°thepointwhere

erdissipationestimateinapplicationsectionofthisdatasheetformoreinformation.

4

Copyright©2012–2014,TexasInstrumentsIncorporated

TPS54340

AC5B–OCTOBER2012–REVISEDMARCH2014

7.5ElectricalCharacteristics

T

J

=–40°Cto150°C,VIN=4.5Vto42V(unlessotherwisenoted)

PARAMETER

SUPPLYVOLTAGE(VINTERMINAL)

Operatinginputvoltage

Internalundervoltagelockoutthreshold

Internalundervoltagelockoutthreshold

hysteresis

Shutdownsupplycurrent

Operating:nonswitchingsupplycurrent

ENABLEANDUVLO(ENTERMINAL)

Enablethresholdvoltage

Inputcurrent

Hysteresiscurrent

VOLTAGEREFERENCE

Voltagereference

HIGH-SIDEMOSFET

On-resistance

ERRORAMPLIFIER

Inputcurrent

Erroramplifiertransconductance(g

M

)–2μA

COMP

<2μA,V

COMP

=1V

Erroramplifiertransconductance(g

M

)during

–2μA

COMP

<2μA,V

COMP

=1V,V

FB

=0.4V

soft-start

Erroramplifierdcgain

Minunitygainbandwidth

Erroramplifiersource/sink

COMPtoSWcurrenttransconductance

CURRENTLIMIT

AllV

IN

andtemperatures,OpenLoop

(1)

Currentlimitthreshold

THERMALSHUTDOWN

Thermalshutdown

Thermalshutdownhysteresis

TIMINGRESISTORANDEXTERNALCLOCK(RT/CLKTERMINAL)

SwitchingfrequencyrangeusingRTmode

f

SW

Switchingfrequency

SwitchingfrequencyrangeusingCLKmode

RT/CLKhighthreshold

RT/CLKlowthreshold0.5

R

T

=200kΩ

100

450

160

1.55

1.2

500

2500

550

2300

2

kHz

kHz

kHz

V

V

176

12

°C

°C

Alltemperatures,VIN=12V,OpenLoop

(1)

V

IN

=12V,T

A

=25°C,OpenLoop

(1)

TESTCONDITIONSMIN

4.5

TYPMAX

42

UNIT

V

V

mV

Rising4.14.3

325

4.48

EN=0V,25°C,4.5V≤VIN≤42V

FB=0.9V,T

A

=25°C

Novoltagehysteresis,risingandfalling

Enablethreshold+50mV

Enablethreshold–50mV–0.58

–2.2

0.792

VIN=12V,BOOT-SW=6V

1.1

1.3

146

1.2

–4.6

–1.2

–3.4

0.8

92

50

350

77

10,000

2500

±30

12

4.5

4.5

5.2

5.5

5.5

5.5

3.5

175

1.3

-1.8

-4.5

0.808

190

μA

V

μA

μA

V

mΩ

nA

μMhos

μMhos

V/V

kHz

μA

A/V

V

FB

=0.8V

V

(COMP)

=1V,100mVoverdrive

6.8

6.25

5.85

A

(1)OpenLoopcurrentlimitmeasureddirectlyattheSWterminalandisindependentoftheinductorvalueandslopecompensation.

Copyright©2012–2014,TexasInstrumentsIncorporated

5

TPS54340

ZHCSAC5B–OCTOBER2012–

7.6TimingRequirements

PARAMETER

ENABLEANDUVLO(ENTERMINAL)

EnabletoCOMPactive

INTERNALSOFT-STARTTIME

Soft-StartTime

Soft-StartTime

HIGH-SIDEMOSFET

Minimumcontrollableontime

CURRENTLIMIT

Currentlimitthresholddelay

TIMINGRESISTORANDEXTERNALCLOCK(RT/CLKTERMINAL)

MinimumCLKinputpulsewidth

RT/CLKfallingedgetoSWrisingedge

delay

PLLlockintime

Measuredat500kHzwithRTresistorinseries

Measuredat500kHz

15

55

78

ns

ns

μs

60ns

VIN=12V,T

A

=25°C135ns

f

SW

=500kHz,10%to90%

f

SW

=2.5MHz,10%to90%

2.1

0.42

ms

ms

V

IN

=12V,T

A

=25°C540µs

TESTCONDITIONSMINTYPMAXUNIT

7.7TypicalCharacteristics

0.25

R

D

S

(

O

N

)

−

O

n

-

S

t

a

t

e

R

e

s

i

s

t

a

n

c

e

(

Ω

)

V

F

B

-

V

o

l

t

a

g

e

R

e

f

e

r

a

n

c

e

(

V

)

0.814

BOOT-SW = 3 V

BOOT-SW = 6 V

0.2

0.809

0.804

0.799

0.794

0.789

0.784

±50

0.15

0.1

0.05

0

−50−25

T

J

− Junction Temperature (°C)

125150

G001

±25 0 25 50 75 100 125 150

C026

V

IN

=12V

stancevsJunctionTemperature

6.5

6.3

H

i

g

h

S

i

d

e

S

w

i

t

c

h

C

u

r

r

e

n

t

(

A

)

T

J

- Junction Temperature (