HT78B33 datasheet(1/16 Pages) HOLTEK

Part #	HT78B33

Description	High PSRR 500mA LDO Regulator

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Manufacturer	HOLTEK [Holtek Semiconductor Inc]

Direct Link	http://www.holtek.com

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Rev. 1.00

1

August 25, 2011

Rev. 0.00

PB

August 25, 2011

HT78Bxx

High PSRR 500mA LDO Regulator

Features

• OutputVoltage:1.5V/1.8V/2.5V/2.8V/

3.0V/3.3V/5V

• HighOutputVoltageAccuracy:±2%

• HT78B25LowVoltageDrop:0.64V(Typ.)

(VOUT=2.5V@IOUT=500mA)

• MaximumInputVoltage:7.0V

• GuaranteedOutputCurrent:500mA

• LowPowerConsumption:18µA(Typ.)

• HighRippleRejection:70dB(1kHz@IOUT=30mA)

• Power-SavingShutdownMode

• OverTemperatureProtection

• CurrentLimiting

• SOT-23-5,SOT223,SOT89Package

Applications

• Portablecommunicationequipment

• Portablemusicplayer

• Electricalappliancessuchascameras,VCRsand

camcorders

• Battery-poweredequipment

General Description

The HT78Bxx series are CMOS-based voltage

regulatorICswithhighoutputvoltageaccuracy,low

quiescentcurrent,lowonResistance,andhighripple

rejection.EachoftheseICsconsistsofavoltage

referenceunit,anerroramplifier,resistor-netfor

voltagesetting,acurrentlimitcircuit,achipenable

circuit,andsoon.

TheHT78Bxx’scurrentlimiters'foldbackcircuit

alsooperatesasashortcircuitprotectfunctionforthe

outputcurrentlimiter.

TheseICsperformwithlowdropoutvoltageandthe

chip-enablefunction.Thequiescentcurrentofthis

ICisonly18μA,andthelinetransientresponseand

theloadtransientresponseofHT78Bxxareexcellent,

thustheseICsareverysuitableforthepowersupply

forhand-heldcommunicationequipment.

Thespace-savingSOT23-5,SOT223andSOT89

packagewillbeanattractiveadditionalfeaturefor

pocketandhand-heldapplications.

Selection Table

Part No.

Output Voltage

Tolerance

Package

HT78B15

1.5V

±2%

SOT23-5

SOT223

SOT89

HT78B18

1.8V

HT78B25

2.5V

HT78B28

2.8V

HT78B30

3.0V

HT78B33

3.3V

HT78B50

5.0V

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HT78B33 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc

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