Datasheet > MIC2224

MIC2224

更新时间： 2023-12-06 20:09:45

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
13页	383K
描述
The MIC2224 is a high efficiency 2MHz PWM?synchronous buck switching regulator optimized for?power

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MIC2224 数据手册

MIC2224

High Efficiency 2MHz PWM Buck Converter with

DAC Input and 40mΩ Bypass Switch

General Description

Features

The MIC2224 is a high efficiency 2MHz PWM synchronous

buck switching regulator optimized for powering 2.5G and

3G CDMA RF Power Amplifiers. The output voltage of

MIC2224 can be dynamically adjusted with an external

DAC to maximize PA efficiency versus required output

power. When the PA requires the highest power, the DAC

can be used to enable a low on-resistance, 40mΩ, bypass

switch that powers the PA directly from the battery.

• 2.7V to 5.5V input voltage range

• DAC-adjustable output voltage down to 0.3V

• 600mA output current in PWM mode

• Internally protected 40mΩ bypass switch

• Allows direct connection of battery to load

• Over 95% efficient

• Fully integrated MOSFET switches

• Constant 2MHz PWM operation

• Internal soft-start

• 1% line and load regulation

• <1µA shutdown current

• Under-voltage lockout

• Thermal shutdown and current limit protection

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

The 2MHz PWM operation of MIC2224 allows the smallest

possible components. It also allows the device to easily

meet stringent W-CDMA V_OUTresponse specifications.

The MIC2224 operates from a 2.7V to 5.5V input, making

it ideal for single cell Li-Ion applications. The device

features built-in power MOSFETs that can supply up to

600mA of output current in PWM mode, or over 1A in

bypass mode. The MIC2224 can operate with a maximum

duty cycle of 100% for use in low-dropout conditions.

The MIC2224 has a junction temperature range of

–40°C to +125°C and is available in a 10-pin 3mm x 3mm

MLF^®package.

Applications

• Cellular phones

• PDAs

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Typical Application

4.7µH

MIC2224

5.4

V_IN2.6V to 5.5V

V_OUT

2, 3

V_IN= 4.2V

4.8

VIN

8, 9

4.2

AVIN

VOUT

Bypass

Mode

3.6

1µF

ENABLE

DAC

3.0

2.4

1.8

DAC

AGND PGND

1.2

GND

0.6

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

2MHz PWM Converter with DAC Input

V_DAC(V)

and 40mꢀ Bypass Switch

MLF and MicroLeadFrame are registered trademarks or Amkor Technology, 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

M9999-091106

September 2006

12 3 4 5 6 7...13

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与MIC2224相关器件

型号	品牌	获取价格	描述	数据表
MIC2224_06	MICREL	获取价格	High Efficiency 2MHz PWM Buck Converter with
MIC2224YML	MICROCHIP	获取价格	2.5A SWITCHING REGULATOR, 2200kHz SWITCHING FREQ-MAX, PDSO10
MIC2224YML	MICREL	获取价格	High Efficiency 2MHz PWM Buck Converter with DAC Input and 40mOHM Bypass Switch
MIC2224YMLTR	MICROCHIP	获取价格	2.5A SWITCHING REGULATOR, 2200kHz SWITCHING FREQ-MAX, PDSO10, 3 X 3 MM, LEAD FREE, MLF-10
MIC2224YML-TR	MICROCHIP	获取价格	2.5A SWITCHING REGULATOR, 2200kHz SWITCHING FREQ-MAX, PDSO10
MIC2225	MICREL	获取价格	2MHz 600mA Synchronous Buck Regulator with 300mA LDO
MIC2225_08	MICREL	获取价格	2MHz 600mA Synchronous Buck Regulator with 300mA LDO
MIC2225-4KYMT	MICREL	获取价格	2MHz 600mA Synchronous Buck Regulator with 300mA LDO
MIC2225-4KYMT	ROCHESTER	获取价格	1A SWITCHING REGULATOR, 2200kHz SWITCHING FREQ-MAX, PDSO10, 2 X 2 MM, GREEN, MLF-10
MIC2225-4KYMT	MICROCHIP	获取价格	Switching Regulator, 1A, 2200kHz Switching Freq-Max, PDSO10

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