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MIC2111A

EOL

Status: Samples Available

Features:

  • Single 3.3V or 5V supply
  • Supports load currents more than 50A
  • 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
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Device Overview

Summary

Micrel's MIC2111 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 MIC2111 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 MIC2111 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 MIC2111 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 MIC2111 offers Micrel's proprietary bi-directional, single wire fault communication for total system protection.

The MIC2111 is available in a 20-pin 3mm x 3mm TQFN package and has a junction temperature range of -40°C to +125°C.

Additional Features
    • Single 3.3V or 5V supply
    • Supports load currents more than 50A
    • 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

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