Datasheet > AME5258-AEV120

AME5258-AEV120

更新时间： 2022-12-19 06:16:43

品牌	Logo	应用领域
AMETHERM		转换器
页数	文件大小	规格书
17页	293K
描述
1.5MHz, 600mA Synchronous Buck Converter

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AME5258-AEV120 数据手册

AME

1.5MHz, 600mA

Synchronous Buck Converter

AME5258

n General Description

n Applications

The AME5258 is a high efficiency monolithic synchro-

nous buck regulator using a constant frequency, current

mode architecture. The device is available in an adjustable

version and fixed output voltages of 1.2V, 1.8V, 2.5V and

3.3V. Supply current with no load is 300mA and drops to

<1mA in shutdown. The 2.5V to 5.5V input voltage range

makes the AME5258 ideally suited for single Li-Ion bat-

tery-powered applications. 100% duty cycle provides low

dropout operation, extending battery life in portable sys-

tems. PWM pulse skipping mode operation provides very

low output ripple voltage for noise sensitive applications.

At very light load, the AME5258 will automatically skip

pulses in pulse skip mode operation to maintain output

regulation.

l Cellular Phones

l Digital Cameras

l Portable Electronics

l USB Devices

l MP3 Players

l LDO Replacement

n Typical Application

The AME5258 is simple to use. As with standard

LDO's,Input and output capacitor are required. The only

other element is a small, low cost, 2.2mH inductor.Low

output voltages are easily supported with the 0.6V feed-

back reference voltage. And 100% duty cycle when Vin

approaches Vout.

Fixed Output Voltage

2.2mH

V_IN

V_OUT

C_IN

4.7mF

CER

AME5258

C_OUT

10mF

CER

OUT

GND

n Features

l High Efficiency: Up to 96%

l 600mA Output Current at V_IN=3V

l 2.5V to 5.5V Input Voltage Range

l 1.5MHz Constant Frequency Operation

l No Schottky Diode Required

Figure 1: High Efficiency Step-Down Conventer

Adjustable Output Voltage

V_IN= 2.5V to 5.5V

V_IN

2.2mH

l Low Dropout Operation: 100% Duty Cycle

l 0.6V Reference Allows Low Output

Voltages

V_OUT

1.8V

600mA

C_IN

4.7mF

CER

AME5258

887K

22pF

l Shutdown Mode Draws<1mA Supply

Current

C_OUT

10mF

CER

GND

l Current Mode Operation for Excellent

Line and Load Transient Response

l Overtemperature Protection

l Internal Soft Start

442K

V_OUT=V_FB(R1+R2)/R2

l Space Saving 5-Pin SOT-25 Package

Figure 2: 1.8V at 600mA Step-Down Requlator

l Meet RoHS Standards

Rev.A.05

12 3 4 5 6 7...17

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