说明
MIC2111B是一种可编程频率、谷值电流/电压模式PWM控制器,为使用电感器两端的电流传感的功率设备和驱动器提供必要的控制和保护功能。MIC2111B可以提供单个三态PWM逻辑信号,以与功率级模块或分立驱动器和MOSFET一起工作。该设备具有精度启用和电源良好(PG)功能,用于对多个电源进行排序。此外,该解决方案与大电流降压DC/DC转换器中的智能功率级兼容。为了优化系统尺寸和系统效率,MIC2111B的频率可以从200kHz编程到2MHz。该设备通过降低频率在轻负载下以节能模式运行。当功率级配置为轻负载模式时,可以进行可选的外部音频范围操作。该解决方案使用差分电流传感以获得更好的限流精度,并使用专用差分放大器进行远程输出传感以实现精确的输出电压控制。MIC2111B具有用于环路补偿的高增益跨导放大器。可以通过电阻器添加外部斜率补偿,以避免亚谐波振荡。其他功能包括可编程OCP、输出OVP和热OTP保护。MIC2111B提供专有的双向、单线故障通信,用于全面的系统保护。MIC2111B有20引脚3mm x 3mm TQFN封装,结温范围为-40°C至+125°C。
特性
- 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
参数
类型 | 描述 |
Current Limit / Short Circuit Protection | 0 |
Enable Pin | 0 |
External Clock Sync | 0 |
Input UVLO Typ (V) | 0 |
Internal Compensation | 0 |
Internal Voltage Bias | 0 |
Iq Off (µA) | 0 |
MaximumInputVoltage | 5 |
MaximumOutputVoltage | 0 |
MinimumInputVoltage | 3.3 |
MinimumOutputVoltage | 0 |
Operating Supply Current (mA) | 0 |
PFM, Discontinuous, Hyperlight load, or Skip Mode | 1 |
Power Good Signal | 1 |
Soft Start | 0 |
Supported Outputs | 1 |
Supported Topologies | Driverless Buck |
Typical Tolerance (%) | 1 |



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