Texas Instruments LM2840-Q1 Handleiding

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FB

GND

SW

CB

SHDN

LM2840/1/2-ADJL

VOUT

VIN

L1

D1

R1

R2

V

IN

C

BOOT

C

IN

C

OUT

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Reference

Design

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LM2840-Q1

,

LM2841-Q1

,

LM2842-Q1

SNVSBE5–APRIL2019

LM284x-Q1AutomotiveSIMPLESWITCHER

®

4.5-Vto42-VInput,0.1-,0.3-,or

0.6-AOutputStep-DownDC/DCRegulatorinThinSOT

1

1Features

1

•AEC-Q100-qualifiedforautomotiveapplications:

–Temperaturegrade1:–40°Cto+125°C,T

A

•Inputvoltage4.5Vto42V

•Outputcurrentoptionsof100mA,300mA,and

600mA

•Feedbackpinvoltageof0.765V

•550-kHz(X)or1.25-MHz(Y)switchingfrequency

•LowshutdownI

Q

:16-µAtypical

•Short-circuitprotected

•Internallycompensated

•Soft-startcircuitry

•Smalloverallsolutionsize(SOT-6Lpackage)

•CreateacustomdesignusingtheLM2840-Q1(or

LM2841-Q1/42-Q1)withtheWEBENCH

®

Power

Designer

2Applications

•AutomotiveADAScamera

•Automotivewirelesscharging

•Automotivebodycontrolandlighting

3Description

TheLM284x-Q1SIMPLESWITCHER™devicesare

PWMDC/DCbuck(step-down)regulators.Withan

inputrangefrom4.5Vto42V,theyaresuitablefora

widerangeofapplications,suchaspower

conditioningfromunregulatedsources.Theyfeature

alowR

DSON

(0.9‑Ωtypical)internalswitchfor

maximumefficiency(85%typical).Operating

frequencyisfixedat550kHz(Xoption)and

1.25MHz(Yoption),allowingtheuseofsmall

externalcomponentswhilestillbeingabletohavelow

outputvoltageripple.Softstartcanbeimplemented

usingtheshutdown(SHDN)pinwithanexternalRC

circuitallowingtheusertotailorthesoft-starttimeto

aspecificapplication.

TheLM2840-Q1isoptimizedforupto100mA,the

LM2841-Q1forupto300mA,andtheLM2842-Q1

forupto600‑mAloadcurrents.Theyallhavea

0.765-Vnominalfeedbackvoltage.

Additionalfeaturesinclude:thermalshutdown,V

IN

undervoltagelockout,andgate-driveundervoltage

lockout.TheLM284x-Q1areavailableinalow-profile

SOT-6Lpackage.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LM2840-Q1,LM2841-Q1,

LM2842-Q1

SOT(6)1.60mm×2.90mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

TypicalApplicationCircuit

Product specificaties