ACE55534AMA+ datasheet, PDF - EEWORLD Datasheet

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ACE55534AMA+: Description400mA LDO Dropout Voltage Regulator; File Size175KB，6 Pages; ManufacturerACE [ACE Technology Co., Ltd.]

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400mA LDO Dropout Voltage Regulator

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ACE555

Technology

Description

400mA LDO Dropout Voltage Regulator

ACE555 is a series of low dropout three terminal regulators with a dropout of 1.22V at 400mA load

current.

Other than a fixed version（Vout＝1.8V,2.5V,2.85V,3.3V,5V）, ACE555 has an adjustable version, which

can provide an output voltage from 1.25 to 13.8V with only two external resistors.

ACE555 offers thermal shut down and current limit functions, to assure the stability of chip and power

system. And it uses trimming technique to guarantee output voltage accuracy within

±2％.

ACE555 is available in SOT-89-3 power Package. Lead free package is also available on command.

Features

•

Other than a fixed version and an adjustable version, output value can be customized on command.

Maximum output current is 400mA

Output voltage accuracy is within

±1％

Range of operation input voltage: Max 18V

Line regulation: 0.2％

Load regulation: 0.4％

Environment Temperature: -50℃~140℃

Application

Power Management for Computer Mother Board, Graphic Card

LCD Monitor and LCD TV

DVD Decode Board

Absolute Maximum Ratings

Parameter

Input voltage

Power Dissipation

SOT-89-3

Junction temperature

Environment Temperature

Storage temperature

Symbol

Max

0.5

150

140

65 to 150

Unit

VER 1.2

ACE555

Technology

Detailed Description

400mA LDO Dropout Voltage Regulator

ACE555 is a series of low dropout voltage, three terminal regulators. Its application circuit is very simple:

the fixed version only needs two capacitors and the adjustable version only needs two resistors and two

capacitors to work. It is composed of some modules including start-up circuit, bias circuit, bandgap,

thermal shutdown, current limit, power transistors and its driver circuit and so on.

The thermal shut down and current limit modules can assure chip and its application system working

safety when the environment temperature is larger than 140

℃

or output current is larger than 600mA.

The bandgap module provides stable reference voltage, whose temperature coefficient is compensated

by careful design considerations. The temperature coefficient is under 100ppm/

℃

. And the accuracy of

output voltage is guaranteed by trimming technique,

Typical Application

ACE555 has an adjustable version and five fixed versions, Chart1 is its typical application.

ACE555

Vin

Cin

10uF

Vin

GND

22uF

Cout

Vout

Application Hints

1.Recommend using 10uF tan capacitor as bypass capacitor(C1) for all application circuit.

2.Recommend using 22uF tan capacitor to assure circuit stability.

3.Using a bypass capacitor(CAdj) between the adjust terminal and ground can improve ripple rejection,

This bypass capacitor prevents ripple from being amplified as the output voltage is increased.The

impedance of CAdj should be less than the resistor’s(R1) which is between output and adjust pins to

prevent ripple from being amplified at any ripple frequency. As R1 is normally in the range of 200Ω~350

Ω,the

value of CAdj should satisfy this equation:2*Fripple*CAdj<R1. Recommend using 10uF tan

capacitor.

VER 1.2

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