general description the pt1301 is a compact, high efficiency, and low voltage step-up dc/dc converter with an adaptive current mode pwm control loop. it comprises of an error amplifier, a ramp generator, a pwm comparator, a switch pass element and the driver. it provides stable and high efficient operation over a wide range of load currents without external compensation. the below 1v start-up input voltage makes pt1301 suitable for single battery cell applications. the built-in power transistor is able to provide up to 300ma output current while working under li-battery supply.besides, it provides extra pin to drive external power devices (nmos or npn ) in case higher output current is needed. the output voltage is set with two external resistors. the 500k hz high switching rate reduces the size of external components. besides, the 14µa low quiescent current together with high efficiency maintains long battery lifetime. 概述 pt1301是一款緊湊的,高效率,低電壓升壓直流/直流轉換器的自適應電流模式pwm控制環路。它包括一個誤差放大器,斜波發生器,pwm比較,通過一個開關元件和驅動器。它了一個寬負載電流范圍內,無需外部補償的穩定和高效運作。 在低于1v的啟動使得pt1301輸入電壓為單電池應用場合。內置的是功率晶體管能夠高達300ma的輸出電流,同時根據鋰電池供電工作。此外,它了額外的引腳,以驅動外部功率器件的情況下更高的輸出電流(nmos或npn)的需要。輸出電壓設置兩個exte rnal電阻。500khz的開關頻率可縮小外部元件的尺寸。另外,14μa的低靜態電流,高效率,保持較長的電池壽命。 特征 ·低簡介sot封裝 ·低靜態(開關關)電源電流:14μa ·低啟動輸入電壓:0.8v的典型 ·高供電能力:具有1alkaline細胞3.3v的100ma電流,5v的300ma的1鋰電池 ¨零電流關斷模式 ·高效率:90% ·固定開關頻率:500khz的 °功能為內部或外部電源開關 ¨包裝形式:采用sot - 26,采用sot - 89 - 5 application mp3, pda, electronic dictionary, dsc, lcd, rf-tag, portable devices, wireless devices, etc. 聯系方式 : 深圳市闊元電子有限公司,專業mos管,ic,二三極管商,常備現貨,量大單價從優,期待您的合作。 聯系方式:翁蘇鈴 13760455447 qq 991882375 地址:深圳市福田區華強北路中航路新亞洲二期n2b232柜 |