ACE555

400mA LDO Dropout Voltage Regulator

VER 1.2

3

Recommended Work Conditions

Item

Min

Nom

Max

Unit

Input Voltage Range

18

V

Ambient Temperature

-50

140

Electrical Characteristics

Symbol

Prameter

Condition

Min

Typical

Max

Units

ACE555-1.8V

1.764

1.80

1.836

V

ACE555-2.5V

2.45

2.5

2.55

V

ACE555-2.85V

2.793

2.85

2.907

V

ACE555-3.3V

3.234

3.3

3.366

V

Vout

Output Voltage

ACE555-5.0V

4.9

5

5.1

V

Vin=5V～15V

0.2

0.4

%

ΔVout

Line Regulation（note1）

ACE555-5.0V

(Vin=7V~15V)

0.2

0.4

%

ΔVout

Load Regulatiion（note1,2）

IL＝0～400mA

0.2

0.4

%

Dropout

Voltage

Input-Output Voltage

Differentia（note3）

ΔVout, ΔVref,=1%，

Iout=400mA

1.22

1.3

V

Current

Limit

Max Load Current

Vin-Vout=2V, Tj=25℃

600

mA

Iq

Quiescent Current

4

8

mA

ΔVout/

ΔT∙Vout

Temperature Stability

0.5

%

Note：1.The Parameters of Line Regulation and Load Regulation in Table1 are tested under constant junction temperature. The

Curve of Load Regulation vs. Temperature is shown in typical parameter curve that follows.

2.When Iout varies between 0~400mA,Vin-Vout varies between 1.5V~12V under constant junction temperature，the

parameter is satisfied the criterion in table. If temperature varies between -50 ≤TA≤140

℃℃，

it needs output current to be

larger than 10mA to satisfy the criterion.

3.Dropout Voltage is specified over the full output current range of the device, and it is tested under following testing

conditions: First step is to find out the Vout value (Vout1) when Vin1=Vout+1.5V, second step is to decrease Vin(Vin2)

until Vout value is equal to 99%*Vout1(Vout2). Vdropout=Vin2-Vout2.

4.Minimum Load Current is defined as the minimum output current required to maintain regulation. When

1.5V Vin

≦

-Vout 12V

≦

，

the device is guaranteed to regulate if the output current is greater than 10mA.