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HT7750

PFM Step-up DC/DC Converter

GeneralDescription TheHT77XXseriesisasetofPFMstep-upDC/DCconverterwithhighefficiencyandlowripple.Theseriesfeaturesextremelylowstart-upvoltageandhighoutputvoltageaccuracy.Theyrequireonlythreeexternalcomponentstoprovideafixedoutputvoltageof1.8V,2.2V,2.7

HT7750

PFM Step-up DC/DC Converter

HT7750

PFM Asynchronous Step-up DC to DC Converter (100mA)

HT7750

PFM Asynchronous Step-up DC to DC Converter (100mA)

HT7750A

PFM Step-up DC/DC Converter

GeneralDescription TheHT77xxAseriesisasetofPFMstep-upDC/DCconverterwithhighefficiencyandlowripple.Theseriesfeaturesextremelylowstart-upvoltageandhighoutputvoltageaccuracy.Theyrequireonlythreeexternalcomponentstoprovideafixedoutputvoltageof2.7V,3.0V,3.3

HT7750BA

5V/200mA PFM 異步升壓轉(zhuǎn)換器; ?低啟動(dòng)電壓：0.85V ( 典型值 )\n ?效率高達(dá) 85%\n ?超低空載輸入電流\n ?高輸出電壓精度：±2.5%\n ?固定輸出電壓：2.7V/3.0V/3.3V/3.7V/5.0V\n ?超低關(guān)機(jī)電流：0.1μA ( 典型值 )\n ?封裝類型： SOT23-3、SOT23-5、SOT89-3、TO92;

HT77xxBA 系列為PFM 升壓DC/DC 轉(zhuǎn)換 器，效率高、紋波低。此系列具有超低啟 動(dòng)電壓以及高輸出電壓精度。僅需少量外 部元器件便可提供固定的2.7V/3.0V/3.3V/ 3.7V/5.0V 輸出電壓。CMOS 技術(shù)確保低電 源電流，使得該系列芯片成為單節(jié)或多節(jié) 電池供電應(yīng)用的理想選擇。\nHT77xxBA系列內(nèi)置一個(gè)振蕩器、一個(gè)PFM 控制電路、一個(gè)驅(qū)動(dòng)晶體管、一個(gè)參考電 壓?jiǎn)卧约耙粋€(gè)高速比較器。采用脈沖頻 率調(diào)制(PFM) 可實(shí)現(xiàn)輕載輸出時(shí)電源電流 以及紋波為最小。這些芯片采用節(jié)省空間 的TO92、SOT89-3、SOT23-3 和SOT23-5 封裝類型。SOT23-5 封裝包含芯片使能功 能，在關(guān)機(jī)模式時(shí)可減小功耗。

HT7750S

100mA PFM Synchronous Step-up DC/DC Converter

TheHT77xxSdevicesareahighefficiencyPFMsynchronousstep-upDC-DCconverterserieswhicharedesignedtooperatewithbothwirewoundchippowerinductorsandalsowithmulti-layeredchippowerinductors.Thedeviceserieshavetheadvantagesofextremelylowstart-upvoltageaswellashigh

HT7750SA

200mA PFM Synchronous Step-up DC/DC Converter

GeneralDescription TheHT77xxSAdevicesareahighefficiencyPFMsynchronousstep-upDC-DCconverterserieswhicharedesignedtooperatewithbothwirewoundchippowerinductorsandalsowithmulti-layeredchippowerinductors.Thedeviceserieshavetheadvantagesofextremelylowstart-upv

HT7750SA

200mA PFM Synchronous Step-up DC/DC Converter; Low start-up voltage: 0.7V (Typ.)\nHigh efficiency: 2.7V ≤ VOUT ≤ 5.0V upper 90% (Typ.)\nHigh output voltage accuracy: ±2.5%\nOutput voltage: 2.7V, 3.0V, 3.3V, 5.0V\nOutput current up to 200mA\nUltra low supply current IDD: 5μA (Typ.)\nLow ripple and low noise\nLow shutdown current: 0.1μA (Typ.)\nTO92, SOT89, SOT23 and SOT23-5 package;

The HT77xxSA devices are a high efficiency PFM synchronous step-up DC-DC converter series which are designed to operate with both wire wound chip power inductors and also with multi-layered chip power inductors. The device series have the advantages of extremely low start-up voltage as well as high output voltage accuracy. Being manufactured using CMOS technology ensures ultra low supply current. Because of their higher operating frequency, up to 500 kHz, the devices have the benefits of requiring smaller outline type lower value external inductors and capacitors. The higher operating frequency also offers the advantages of much reduced audio frequency noise. The devices require only three external components to provide a fixed output voltage of 2.7V, 3.0V, 3.3V, 3.7V or 5.0V.\nThe HT77xxSA devices include an internal oscillator, PFM control circuit, driver transistor, reference voltage unit and a high speed comparator. They employ pulse frequency modulation techniques, to obtain minimum supply current and ripple at light output loading. These devices are available in space saving TO92, SOT89, SOT23 and SOT23-5 packages. For SOT23-5 package types, they also include an internal chip enable function to reduce power consumption when in the shutdown mode.

HT7750A

PFM Step-up DC/DC Converter