HT72Bxx
High PSRR 300mA LDO Regulator
Features
General Description
•ꢀ OutputꢀVoltage:ꢀ1.5V/1.8V/2.5V/2.8V/ꢀ
3.0V/3.3V/5V
TheꢀHT72Bxxꢀ seriesꢀareꢀCMOS-basedꢀ voltageꢀ
regulatorꢀICsꢀwithꢀhighꢀoutputꢀvoltageꢀaccuracy,ꢀlowꢀ
quiescentꢀcurrent,ꢀlowꢀonꢀResistance,ꢀandꢀhighꢀrippleꢀ
rejection.ꢀEachꢀofꢀtheseꢀICsꢀconsistsꢀofꢀaꢀvoltageꢀ
referenceꢀunit,ꢀanꢀerrorꢀamplifier,ꢀresistor-netꢀforꢀ
voltageꢀsetting,ꢀaꢀcurrentꢀlimitꢀcircuit,ꢀaꢀchipꢀenableꢀ
circuit,ꢀandꢀsoꢀon.
•ꢀ HighꢀOutputꢀVoltageꢀAccuracy:ꢀ±2%
•ꢀ HT72B25ꢀLowꢀVoltageꢀDrop:ꢀ0.34Vꢀ(Typ.)ꢀ
(VOUT=2.5Vꢀ@ꢀIOUT=300mA)
•ꢀ MaximumꢀInputꢀVoltage:ꢀ7.0V
•ꢀ GuaranteedꢀOutputꢀCurrent:ꢀ300mA
•ꢀ LowꢀPowerꢀConsumption:ꢀ18uAꢀ(Typ.)
•ꢀ HighꢀRippleꢀRejection:ꢀ70dBꢀ(1kHz@IOUT=30mA)
•ꢀ Power-savingꢀShutdownꢀMode
•ꢀ OverꢀTemperatureꢀProtection
TheꢀHT72Bxx’sꢀcurrentꢀlimiters'ꢀfoldꢀbackꢀcircuitꢀ
alsoꢀoperatesꢀasꢀaꢀshortꢀcircuitꢀprotectꢀfunctionꢀforꢀtheꢀ
outputꢀcurrentꢀlimiter.
TheseꢀICsꢀperformꢀwithꢀlowꢀdropoutꢀvoltageꢀandꢀtheꢀ
chip-enableꢀfunction.ꢀTheꢀquiescentꢀcurrentꢀofꢀthisꢀICꢀ
isꢀonlyꢀ18μA,ꢀandꢀtheꢀlineꢀtransientꢀresponseꢀandꢀtheꢀ
loadꢀtransientꢀresponseꢀofꢀHT72Bxxꢀareꢀexcellent,ꢀ
thusꢀtheseꢀICsꢀareꢀveryꢀsuitableꢀforꢀtheꢀpowerꢀsupplyꢀ
forꢀhand-heldꢀcommunicationꢀequipment.
•ꢀ CurrentꢀLimiting
•ꢀ SOT23-5,ꢀSOT89ꢀPackage
Applications
•ꢀ Portableꢀcommunicationꢀequipment
Theꢀspace-savingꢀSOT23-5,ꢀSOT89ꢀpackageꢀwillꢀbeꢀ
anꢀattractiveꢀadditionalꢀfeatureꢀforꢀpocketꢀandꢀhand-
heldꢀapplications.
•ꢀ Portableꢀmusicꢀplayer
•ꢀ Electricalꢀappliancesꢀsuchꢀasꢀcameras,ꢀVCRsꢀandꢀ
camcorders
•ꢀ Battery-poweredꢀequipment
Selection Table
Part No.
HT72B15
HT72B18
HT72B25
HT72B28
HT72B30
HT72B33
HT72B50
Output Voltage
1.5V
Tolerance
Package
1.8V
2.5V
SOT23-5
SOT89
2.8V
±2%
3.0V
3.3V
5.0V
Rev. 1.00
1
August 24, 2011