HT7718S datasheet(1/29 Pages) HOLTEK

부품명	HT7718S

상세설명	100mA PFM Synchronous Step-up DC/DC Converter

PDF	29 Pages

Scroll/Zoom	100%

제조업체	HOLTEK [Holtek Semiconductor Inc]

홈페이지	http://www.holtek.com

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1 / 29 page

Rev. 1.00

1

February 22, 2012

Rev. 1.00

PB

February 22, 2012

HT77xxS

100mA PFM Synchronous

Step-up DC/DC Converter

Features

• Lowstart-upvoltage:0.7V(Typ.)

• Highefficiency:1.8V≤ VOUT≤ 2.2Vupper80%,

2.7V≤ VOUT≤ 5.0Vupper85%(Typ.)

• Highoutputvoltageaccuracy:±2.5%

• Outputvoltage:1.8V,2.2V,2.7V,3.0V,3.3V,3.7V,

5.0V

• Outputcurrentupto100mA

• UltralowsupplycurrentIDD:4μA(Typ.)

• Lowrippleandlownoise

• Lowshutdowncurrent:0.1μA(Typ.)

• TO92,SOT89,SOT23andSOT23-5package

Applications

• Palmtops/PDAs

• Portablecommunicators/Smartphones

• Cameras/Camcorders

• Battery-poweredequipment

General Description

TheHT77xxSdevicesareahighefficiencyPFMsyn-

chronousstep-upDC-DCconverterserieswhichare

designedtooperatewithbothwirewoundchippower

inductorsandalsowithmulti-layeredchippower

inductors.Thedeviceserieshavetheadvantagesof

extremelylowstart-upvoltageaswellashighoutput

voltageaccuracy.BeingmanufacturedusingCMOS

technologyensuresultralowsupplycurrent.Because

oftheirhigheroperatingfrequency,upto500kHz,

thedeviceshavethebenefitsofrequiringsmallerout-

linetypelowervalueexternalinductorsandcapaci-

tors.Thehigheroperatingfrequencyalsooffersthe

advantagesofmuchreducedaudiofrequencynoise.

Thedevicesrequireonlythreeexternalcomponents

toprovideafixedoutputvoltageof1.8V,2.2V,2.7V,

3.0V,3.3V,3.7Vor5.0V.

TheHT77xxSdevicesincludeaninternaloscillator,

PFMcontrolcircuit,drivertransistor,referencevolt-

ageunitandahighspeedcomparator.Theyemploy

pulsefrequencymodulationtechniques,toobtain

minimumsupplycurrentandrippleatlightoutput

loading.Thesedevicesareavailableinspacesaving

TO92,SOT89,SOT23andSOT23-5packages.For

SOT23-5packagetypes,theyalsoincludeaninternal

chipenablefunctiontoreducepowerconsumption

whenintheshutdownmode.

Selection Table

Part No.

Output Voltage

Tolerance

Package

HT7718S

1.8V

±2.5%

TO92

SOT89

SOT23

SOT23-5

HT7722S

2.2V

HT7727S

2.7V

HT7730S

3.0V

HT7733S

3.3V

HT7737S

3.7V

HT7750S

5.0V

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HT7718S 데이터시트(PDF) 1 Page - Holtek Semiconductor Inc

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