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3 STRINGS

OF 4 LEDS

FOR

KEYPAD

LP3958

SW

MAIN

SUB

KEY1

KEY2

KEY3

Li-Ion Battery

or Charger

= 70 mA

= 8...18 V

FB

VDD2

10F

L1

10PH

P

MCU

SCL

SDA

SUB

BACKLIGHT

0...25 mA/LED

MAIN

BACKLIGHT

0...25 mA/LED

NRST

VDDIO

IKEY

IRT

VDDA

100 nF

VREF

D1

VDD1

100 nF

GND 1-5

100 nF

1 PF

GPIO[0]/PWM

GPIO[1]

GPIO[2]

2 x 4.7 éF

+

C

OUT

I

MAX

V

OUT

C

VDDA

C

IN

C

VDD

C

VREF

R

KEY

R

RT

R

SDA

V

DDIO

C

VDDIO

LP3958

www.ti.com

SNVS423C–JANUARY2006–REVISEDMARCH2013

LightingManagementUnitwithHighVoltageBoostConverter

CheckforSamples:LP3958

1

FEATURES

DESCRIPTION

LP3958isaLightingManagementUnitforportable

2

•High-EfficiencyBoostConverterWith

applications.Itisusedtodrivedisplaybacklightand

ProgrammableOutputVoltage

keypadLEDs.Thedevicecandrive5separately

•TwoIndividualDriversforSerialDisplay

connectedstringsofLEDswithhighvoltageboost

BacklightLEDs

converter.

•ThreeDriversforSerialKeypadLEDs

ThekeypadLEDdriverallowsdrivingLEDsfromhigh

•AutomaticDimmingController

voltageboostconverterorseparatesupply

voltage.TheMAINandSUBoutputsarehigh

•StandAloneSerialLeypadLEDsController

resolutioncurrentmodedrivers.KeypadLEDoutputs

•ThreeGeneral-PurposeIOPins

canbeusedinswitchmodeandcurrentmode.

•25-BumpDSBGAPackage:2.54mmx2.54mm

ExternalPWMcontrolcanbeusedforanyselected

x0.6mm

outputs.

Thedeviceiscontrolledthrough2-wirelowvoltage

APPLICATIONS

I

2

Ccompatibleinterfacethatreducesthenumberof

•CellularPhonesandPDAs

requiredconnections.

•MP3Players

LP3958isofferedinatiny25-bumpDSBGA

package.

•DigitalCameras

TypicalApplication

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2006–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspecifikationer