Microchip MIC2111 Handleiding

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MIC2111B

High-Performance, Multi- Mode,

Step- Down Controller

Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 9440800 • fax + 1 (408) 4741000 • San --http://www.micrel.com

October

13, 2015

Revision 2.1

General Description

MicrelMIC2111B’s is a programmablefrequency, valley--

current/voltage-mode PWM controller that provides the

control and protection features necessary for power

devices and drivers use current sensing across the that

inductor.The MIC2111Bstate can provide single tri-PWM

logic signal to work with either powerstage modules or -

discrete driverThe devicehas precision and MOSFETs.

enable and powerfunctions for sequencing of -good (PG)

multiple power supplIn additionthe solution ies. , is

compatible with intelligent power stages in a high-current,

step-down DC/DC converter.

To optimize system size and system efficiency, the

MIC2111Bfrequ ency can be programmed from 200kHz to

2MHz. The device operates in power-saving mode at light

loads by reducing udio rangefrequency. Optional outside a

operation the is possible when power-stage is configured

in light load mode.The solutionuses different ial current

sensing for better currentlimit accuracy- and a dedicated

differential amplifier for remote output sensing for accurate

output voltage control.has a high The MIC2111B -gain

transconductance amplifier for loop compensation.

External slope compensation can added through be a

resistor to avoid sub-harmonic oscillations. Otherfeatures

include programmable OCP, output and thermal OVP,

OTP protections. The MIC2111B offers Micrel’s proprietary

bi-directional, single wire fault communication for total

system protection.

The MIC2111B 20-pis available in a in 3mm × 3mm TQ FN

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

•4 Supports load currents up to 0A

•--Programmable valleycurrent/voltagemode PWM

architecture

•3.3V logic PWM output compatible with power-stage

modules and DrMOS modules

•- Single tristate 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 softstart/softstop and prebiased safe

startup.

• Supports light load and outside audio modes

•Programmable slope compensation and loop

compensation

•- Enable input, powergood (PG) output for sequencing

•Programmable OCP, OTP, and output thermal OVP,

dedicated FAULTpin for system safe startup/stopb

• Internal thermal shutdown and UVLO

• °°–40C to +125C junction temperature range

•-TQ Available in 20pin 3mm × 3mm FN package

Applications

• Servers and work stations

• Routers, switchesnetworking/telecom infrastructure ,

• Printers, scanners, graphics and video cards

•- High current, highperformance POLs

Product specificaties