MIC2111B中文资料5V, 2MHZ High Performnace Driverless PWM Controller数据手册Microchip规格书

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

简介

MIC2111B属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由制造生产的MIC2111BDC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。