Microchip MIC2111 Bedienungsanleitung

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MIC2111B

High-Performance, Multi-Mode,

Step-Down Controller

Micrel Inc. • 2180 Fortune Drive • SanJose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

October

13, 2015

Revision 2.1

General Description

Micrel’sMIC2111Bis a programmable-frequency, valley-

current/voltage-mode PWM controller that provides the

control and protection features necessary forpower

devices and drivers thatuse current sensing across the

inductor.The MIC2111Bcan provide single tri-state PWM

logic signal to work with either power-stage modules or

discrete driverandMOSFETs. The devicehas precision

enable and power-good(PG) functions for sequencing of

multiple power supplies. In addition, the solution is

compatible with intelligent power stages ina high-current,

step-down DC/DC converter.

Tooptimize system size and system efficiency, the

MIC2111Bfrequency can be programmed from 200kHz to

2MHz. The deviceoperates in power-saving mode at light

loads by reducing frequency. Optional outside audio range

operation is possible whenthe power-stage is configured

in light load mode.The solutionuses differential current

sensing for better current-limit accuracyand adedicated

differential amplifier for remote output sensing for accurate

output voltage control.The MIC2111Bhas a high-gain

transconductance amplifier for loop compensation.

External slope compensation can be added through a

resistor to avoid sub-harmonic oscillations.Otherfeatures

includeprogrammable OCP, output OVP, and thermal

OTP protections. The MIC2111Boffers Micrel’s proprietary

bi-directional, single wire fault communication for total

system protection.

The MIC2111Bis available in a 20-pin 3mm × 3mm TQFN

package and has a junction temperature range of –40°C to

+125°C.

Datasheets and support documentation are availableon

Micrel’s web site at: www.micrel.com

.

Features

•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 × 3mm TQFN package

Applications

•Servers and work stations

•Routers, switches, networking/telecom infrastructure

•Printers, scanners, graphics and video cards

•High current, high-performance POLs

Produktspezifikationen