描述 Description

The MIC2238 is dual output 2-phase synchronous buck (step down) PWM DC/DC switching regulator. Power conversion efficiencies of above 95% are easily obtainable for a wide range of applications and loads. An ultra-low quiescent current of 28μA at light loads assures minimum current draw in battery powered applications that require standby modes. The 2.5MHz PWM operation of MIC2238 allows the use of miniature 1μH, 2.2μH or 4.7μH inductor with the use of 2.2μF ceramic output capacitor. The MIC2238 operates from 2.5V to 5.5V input and is available in fixed output voltage versions to save space and reduce external component count. The MIC2238-AA's (adjustable version) output voltage versions can be programmed as low as 0.8VFor applications that require the lowest noise performance, the /FPWM pin allows the automatic Trickle mode to be disabled, remaining in full PWM mode. To maximize battery life in low-dropout conditions, MIC2238 can operate with a maximum duty cycle of 100%.

特性 Features

? Input voltage range: 2.5V to 5.5V
? Dual output voltages running out of phase
? 28μA quiescent current
? Fixed output voltage versions
? Adjustable version down to 0.8V
? Low noise 2.5MHz PWM operation
? 800mA output current capability for each channel
? Stable with 2.2μH inductor, 2.2μF ceramic cap
? Automatic switching into light load mode of operation
? /FPWM pin allows low noise all-PWM mode operation
? Power good output with internal 5μA current source allows sequencing with programmable delay time
? Internal soft-start
? 1μA shutdown current
? Built-in soft-start circuitry
? Current limit protection

簡(jiǎn)介

MIC2238屬于集成電路（IC）的穩(wěn)壓器-DC-DC開關(guān)穩(wěn)壓器。由制造生產(chǎn)的MIC2238穩(wěn)壓器 - DC-DC 開關(guān)穩(wěn)壓器DC-DC 開關(guān)穩(wěn)壓器 PMIC（電源管理集成電路）產(chǎn)品族中的產(chǎn)品是元器件級(jí)設(shè)備，用于需要穩(wěn)定 DC 輸入電壓和/或?qū)⑵滢D(zhuǎn)換為不同幅度的輸出電壓的應(yīng)用。這些器件與稱為“控制器”PMIC 的類似產(chǎn)品的區(qū)別在于集成了主開關(guān)元件，設(shè)備提供的電力會(huì)通過該元件。