描述 Description

MIC2111B is a programmable-frequency, valley-current/voltage-mode PWM controller that provides the control and protection features necessary for power devices and drivers that use current sensing across the inductor. The MIC2111B can provide single tri-state PWM logic signal to work with either power-stage modules or discrete driver and MOSFETs. The device has precision enable and power-good (PG) functions for sequencing of multiple power supplies. In addition, the solution is compatible with intelligent power stages in a high-current, step-down DC/DC converter.To optimize system size and system efficiency, the MIC2111B frequency can be programmed from 200kHz to 2MHz. The device operates in power-saving mode at light loads by reducing frequency. Optional outside audio range operation is possible when the power-stage is configured in light load mode. The solution uses differential current sensing for better current-limit accuracy and a dedicated differential amplifier for remote output sensing for accurate output voltage control. The MIC2111B has a high-gain transconductance amplifier for loop compensation.External slope compensation can be added through a resistor to avoid sub-harmonic oscillations. Other features include programmable OCP, output OVP, and thermal OTP protections. The MIC2111B offers proprietary bi-directional, single wire fault communication for total system protection.The MIC2111B is available in a 20-pin 3mm x 3mm TQFN package and has a junction temperature range of -40°C to +125°C.

特性 Features

? Single 3.3V or 5V supply
? Supports load currents up to 40A
? Programmable valley-current/voltage-mode PWM architecture
? 3.3V logic PWM output compatible with power-stage modules and DrMOS modules
? Single tri-state PWM output
? Programmable switching frequency: 200kHz to 2MHz
? Differential remote sensing for output voltage and inductor current
? 0.6V reference voltage with total ±1% accuracy for output
? Adjustable soft-start/soft-stop and pre-biased safe startup
? Supports light load and outside audio modes
? Programmable slope compensation and loop compensation
? Enable input, power-good (PG) output for sequencing
? Programmable OCP, output OVP, thermal OTP, and dedicated FAULTb pin for system safe startup/stop
? Internal thermal shutdown and UVLO
? -40°C to +125°C junction temperature range
? Available in 20-pin 3mm x 3mm TQFN package

簡(jiǎn)介

MIC2111B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MIC2111BDC-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。