Datasheet > MIC4721

MIC4721

更新时间： 2023-12-06 20:03:17

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
19页	814K
描述
The MIC4721 is a high efficiency PWM buck (step-down) regulators that provides up to 1.5A of out

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MIC4721 数据手册

MIC4721

1.5A 2MHz Integrated Switch

Buck Regulator

General Description

Features

The Micrel MIC4721 is a high efficiency PWM buck (step-

down) regulators that provides up to 1.5A of output

current. The MIC4721 operates at 2MHz and has

proprietary internal compensation that allows a closed loop

bandwidth of over 200KHz.

• 2.7 to 5.5V supply voltage

• 2MHz PWM mode

• Output current to 1.5A

• Up to 94% efficiency

• 100% maximum duty cycle

The low on-resistance internal p-channel MOSFET of the

MIC4721 allows efficiencies up to 94%, reduces external

components count and eliminates the need for an

expensive current sense resistor.

• Adjustable output voltage option down to 1V

• Ultra-fast transient response

• Ultra-small external components

Stable with a 1µH inductor and a 4.7µF output capacitor

• Fully integrated 1.5A MOSFET switch

• Micropower shutdown

The MIC4721 operates from 2.7V to 5.5V input and the

output can be adjusted down to 1V. The devices can

operate with a maximum duty cycle of 100% for use in low-

dropout conditions.

• Power Good pin

• Thermal shutdown and current limit protection

• Pb-free 10-pin MSOP package

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

The MIC4721 is available in the 10-pin MSOP package

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

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Applications

• FPGA/DSP/ASIC applications

• General point of load

• Broadband communications

• DVD/TV recorders

• Point of sale

• Printers/Scanners

• Set top boxes

• Computing peripherals

• Video cards

___________________________________________________________________________________________________________

Typical Application

5V to 3.3V Efficiency

1.5A 2MHz Buck Regulator

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

OUTPUT CURRENT (A)

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

M9999-052907-A

May 2007

12 3 4 5 6 7...19

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