描述 Description

The MIC2155 and MIC2156 are a family of 2-phase, single output synchronous buck control ICs featuring small size, high efficiency, and a high level of flexibility. The ICs implement a 500kHz (MIC2155) and 300kHz (MIC2156) voltage mode PWM control, with the outputs switching 180° out of phase. The result of the out-of-phase operation is 1MHz (or 600kHz) input ripple with ripple current cancellation, minimizing the required input filter capacitance. A 1% output voltage tolerance allows the maximum level of system performance. Internal drivers with adaptive gate drive allow the highest efficiency with the minimum external components.
Two independent enable pins and a power good output are provided, allowing a high level of control and sequencing capability.
The MIC215x family has a junction operating range from -40°C to +125°C.

特性 Features

·Synchronous Buck Control ICs with outputs switching 180° out-of-phase
·Remote sensing with internal differential amplifier
·4.5V to 14.5V input voltage range
·Adjustable output voltages down to 0.7V
·1% output voltage accuracy
·Starts up into a pre-biased output
·500kHz PWM operation (MIC2155)
·300kHz PWM operation (MIC2156)
·Adaptive gate drive allows efficiencies over 95%
·Adjustable current limit with no sense resistor
·Senses low-side MOSFET current

簡介

MIC2156屬于集成電路（IC）的PMIC-穩(wěn)壓器-DCDC開關(guān)式控制器。由制造生產(chǎn)的MIC2156DC-DC 開關(guān)控制器PMIC（電源管理集成電路）DC 到 DC 開關(guān)式控制器是用于高效率電路的穩(wěn)壓 IC，其配置為生成高于（突升或步升）或低于（突降或步降）輸入電源的輸出電源電壓。其他拓?fù)浣Y(jié)構(gòu)可能包括：降壓-升壓、反激、正激、Cuk、SEPIC、全橋、半橋和推挽式。這些器件不同于需要最小電壓并“燒盡”多余電壓的線性穩(wěn)壓器。