MIC2111B
High-Performance, Multi-Mode,
Step-Down Controller General Description Features Micrel’s MIC2111B is a programmable-frequency, valleycurrent/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. 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 В±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 × 3mm TQFN package 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 …