MIC2111BYMT-TR 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 MIC2111BYMT-TR 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 MIC2111BYMT-TR 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 MIC2111BYMT-TR 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 MIC2111BYMT-TR offers proprietary bi-directional, single wire fault communication for total system protection.The MIC2111BYMT-TR is available in a 20-pin 3mm x 3mm TQFN package and has a junction temperature range of -40°C to +125°C.
Feature
- 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
