HT7463A datasheet(1/16 Pages) HOLTEK

Part #	HT7463A

Description	52V/600mA, 1.25MHz/550kHz Asynchronous Step Down Converter

PDF	16 Pages

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Manufacturer	HOLTEK [Holtek Semiconductor Inc]

Direct Link	http://www.holtek.com

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1 / 16 page

Rev. 1.11

1

August 12, 2016

Rev. 1.00

PB

August 12, 2016

HT7463A/HT7463B

52V/600mA, 1.25MHz/550kHz

Asynchronous Step Down Converter

Features

• WideInputVoltageRange4.5Vto52V

• 52V/0.9ΩInternalPowerMOSFET

• 600mAPeakOutputCurrent

• Upto90%Efficiency

• 1.25MHz(HT7463A)and550kHz(HT7463B)

FixedOperatingFrequency

• UltraLowShutdownCurrent<1µA

• OutputShortCircuitProtection

• ThermalShutdownProtection

• PackageType:SOT23-6

Applications

• PowerMeters

• DistributionPowerSystems

• BatteryChargers

• Pre-RegulatorforLinearRegulators

General Description

TheHT7463A/Bisacurrentmodebuckconverter.

With a wide input range from 4.5V to 52V,

the HT7463A/B is suitable for a wide range of

applications such as power conditioning from

unregulatedsources.Havingalowinternalswitch

typicalRDSONvalueof0.9Ω,thedevicehasagood

operatingtypicalefficiencyvalueof85%andthe

addedadvantageofreducedjunctiontemperature.

Theoperatingfrequencyisfixedat1250/550kHzfor

theHT7463A/HT7463Brespectively.TheHT7463A

allowstheuseofsmallexternalcomponentswhile

stillbeingabletohavelowoutputvoltageripple.

Asoft-startfunctioncanbeimplementedusingthe

enablepinandbyconnectinganexternalRCcircuit

allowingtheusertotailorthesoft-starttimetoa

specificapplication.

Application Circuit

CB

GND

FB

SW

VIN

EN

CB

0.1µF

VOUT=12V *1

L1

22µH/47µH *3

D1

C3

0.1µF

C4

22µF *2

R2

6kΩ / ±1%

R1

84kΩ / ±1%

C1

0.1µF

C2

100µF

On/Off

Control

VIN

1

2

3

4

5

6

HT7463A/B

Note:*1.C4=330μFisrecommendedtoachieve1‰outputripplerequirement

*2.SetR1=84kΩandR2=16kΩforVOUT=5Vapplication

*3.It’srecommendedthatL1=22μHforHT7463AandL1=47μHforHT7463B

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