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HT7466 Datasheet(PDF) 1 Page - Holtek Semiconductor Inc |
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HT7466 Datasheet(HTML) 1 Page - Holtek Semiconductor Inc |
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1 / 9 page  Rev. 1.00 1 September 02, 2011 Rev. 1.00 PB September 02, 2011 HT7466 3A Step-Down DC to DC Converter Feature • Inputvoltagerange:4.75Vto24V • Variableoutputvoltagerange:1.222Vto20V • 3Aoutputcurrent • Efficiencyupto91% • Fixed380kHzoperatingfrequency • 20mAshutdowncurrent • InternalpowerMOSFETswitch • StableoperationusinglowESRceramiccapacitors • Overtemperatureprotection • Cycle-by-cycleovercurrentprotection • Soft-startfunction • Undervoltagelockoutprotection • 8-pinSOPpackage Applications • Batterychargers • Distributedpowersystems • LEDpowersupplies • DSLmodems • Linearregulatorprepowerprocessing • Set-Top-Boxes,DVDplayers,LCDdisplays General Description TheHT7466isaDC-DCbuckregulator.Thebuilt- inhighdriverNMOSprovidesamonolithicsolution forhighefficiencystep-downDC-DCconverter.With 3Aoutputcurrent,thewideinputvoltagerangeand stableoutputvoltageregulationcanwidelyuseinall kindsofapplication,likecommunication,powerfor highpowerLED,batterycharger,etc.Theprotection functionincludeovercurrentandovertemperature protection.Thesoftstartfunctionpreventinrush supplycurrentandoutputovershootwheninitial startup.Theundervoltagelockoutissetto4.1V.It preventsabnormalsituationoccurring. TheHT7466requiresaminimumnumberofstandard externalcomponentsandisavailableina8-pinSOP packageforsmallareaPCBapplication. Application Circuit B330A VIN EN SS GND COMP HT7466 BS SW FB 22uF 10uF L 10nF 10nF R2 R1 VIN VOUT + × = 2 2 1 R R R V V FB OUT 4.75~24V C4 C1 C2 C3 R3 C6 C5 Efficiency vs Output Current |
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