Datasheet > MIC2111BYMT

MIC2111BYMT

更新时间： 2024-11-06 01:21:23

品牌	Logo	应用领域
麦瑞 - MICREL		/
页数	文件大小	规格书
35页	3118K
描述
High-Performance, Multi-Mode, Step-Down Controller

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MIC2111BYMT 数据手册

MIC2111B

High-Performance, Multi-Mode,

Step-Down Controller

General Description

Features

Micrel’s MIC2111B 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 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

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

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 MIC2111B 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 MIC2111B offers Micrel’s proprietary

bi-directional, single wire fault communication for total

system protection.

• 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

The MIC2111B is available in a 20-pin 3mm × 3mm TQFN

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

+125°C.

• Servers and work stations

• Routers, switches, networking/telecom infrastructure

• Printers, scanners, graphics and video cards

• High current, high-performance POLs

Datasheets and support documentation are available on

Micrel’s 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 • http://www.micrel.com

Revision 2.1

October 13, 2015

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