MIC2111B High-Performance, Multi-Mode, Step-Down Controller General Description Features Micrels MIC2111B is a programmable-frequency, valley- Single 3.3V or 5V supply current/voltage-mode PWM controller that provides the Supports load currents up to 40A control and protection features necessary for power Programmable valley-current/voltage-mode PWM devices and drivers that use current sensing across the architecture inductor. The MIC2111B can provide single tri-state PWM 3.3V logic PWM output compatible with power-stage logic signal to work with either power-stage modules or modules and DrMOS modules discrete driver and MOSFETs. The device has precision enable and power-good (PG) functions for sequencing of Single tri-state PWM output multiple power supplies. In addition, the solution is Programmable switching frequency: 200kHz to 2MHz. compatible with intelligent power stages in a high-current, Differential remote sensing for output voltage and step-down DC/DC converter. inductor current To optimize system size and system efficiency, the 0.6V reference voltage with total 1% accuracy for MIC2111B frequency can be programmed from 200kHz to output 2MHz. The device operates in power-saving mode at light Adjustable soft-start/soft-stop and pre-biased safe loads by reducing frequency. Optional outside audio range startup. operation is possible when the power-stage is configured Supports light load and outside audio modes in light load mode. The solution uses differential current Programmable slope compensation and loop sensing for better current-limit accuracy and a dedicated compensation differential amplifier for remote output sensing for accurate output voltage control. The MIC2111B has a high-gain Enable input, power-good (PG) output for sequencing transconductance amplifier for loop compensation. Programmable OCP, output OVP, thermal OTP, and External slope compensation can be added through a dedicated FAULTb pin for system safe startup/stop resistor to avoid sub-harmonic oscillations. Other features Internal thermal shutdown and UVLO include programmable OCP, output OVP, and thermal 40C to +125C junction temperature range OTP protections. The MIC2111B offers Micrels proprietary bi-directional, single wire fault communication for total Available in 20-pin 3mm 3mm TQFN package system protection. Applications The MIC2111B is available in a 20-pin 3mm 3mm TQFN Servers and work stations package and has a junction temperature range of 40 C to Routers, switches, networking/telecom infrastructure +125C. Printers, scanners, graphics and video cards Datasheets and support documentation are available on High current, high-performance POLs Micrels web site at: www.micrel.com. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC2111B Typical Application MIC2111B and DrMOS for a 25A Synchronous Buck Converter Revision 2.1 October 13, 2015 2