Datasheet > MIC2267

MIC2267

更新时间： 2023-12-06 20:11:51

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
19页	879K
描述
The MIC2267 is a USB Power Maximizer which transfers the maximum power from the limited USB curr

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MIC2267 数据手册

MIC2267

Input Current Limiting

Synchronous Buck Regulator

USB Power Maximizer™

General Description

Features

• Input voltage range: 3.0V to 5.5V

The MIC2267 is a USB Power Maximizer™ which

transfers the maximum power from the limited USB current

source by shaping the input current limit profile. It

incorporates a high efficiency, integrated synchronous step

down regulator. Internal 150mΩ switches and adjustable

operating frequency allows the MIC2267 to achieve

greater than 90% efficiency across a broad load range. It

replaces the USB current limit switch, 5V buck regulator

and minimizes capacitance for many USB applications.

The adjustable frequency control can be utilized to move

harmonics away from sensitive frequency bands.

• Output voltage adjustable down to 1.0V

• Up to 96% efficiency at 500mA output

• Efficiency >90% across a broad load range

• Fast transient response

• Adjustable frequency from 400kHz to 1.5MHz

• Adjustable input current limiting 100mA to over 1A

• 100% maximum duty cycle

• Fully integrated MOSFET switches

• Micropower shutdown

• Thermal shutdown and output current limit protection

• 12-pin 3mm x 3mm MLF^®

The MIC2267 allows the input current limit profile to be

shaped for various applications. With a current mode

control with external compensation, the MIC2267 transient

response can be optimized over load and output

capacitance making it highly flexible for many applications.

• Junction temperature range: −40°C to +125°C

Additional features include 1µA shutdown current, output

current limit and thermal shutdown protection. The

MIC2267 is available in a 12-pin 3mm x 3mm MLF^®with a

junction operating range from –40°C to +125°C.

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Applications

• USB power

• Wireless router cards

• General buck converter applications

_______________________________________________________________________________________________________

Typical Application

Efficiency vs.

Output Current

100

V_IN= 4.2V

V_IN= 5.5V

V_OUT= 3.3V

0.5

1.5

OUTPUT CURRENT (A)

MIC2267 USB Input Current Limiting Synchronous Buck Regulator

Efficiency 5V_INto 3.3V_OUT

USB Power Maximizer is a trademark of Micrel, Inc.

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

M9999-011711-A

January 2011

12 3 4 5 6 7...19

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