MIC2238数据手册集成电路（IC）的稳压器-DC-DC开关稳压器规格书PDF

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

简介

MIC2238属于集成电路（IC）的稳压器-DC-DC开关稳压器。由制造生产的MIC2238稳压器 - DC-DC 开关稳压器DC-DC 开关稳压器 PMIC（电源管理集成电路）产品族中的产品是元器件级设备，用于需要稳定 DC 输入电压和/或将其转换为不同幅度的输出电压的应用。这些器件与称为“控制器”PMIC 的类似产品的区别在于集成了主开关元件，设备提供的电力会通过该元件。