ACE1085

3A Low Dropout Linear Regulator

VER 1.2

4

Thermal

Resistance

junction to case

TO-252

TO-263

TO-220

12.5

3

3

℃

/W

Note1:The Parameters of Line Regulation and Load Regulation in Table1 are tested under constant junction temperature.

Note2:When Iout varies between 0~3A,Vin-Vout varies between 1.5V~6V 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.

Note3:Dropout Voltage is tested

under Iout=3A and

the 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.

Note4:Minimum Load Current is defined as the minimum output current required to maintain regulation.

When 1.5V≦Vin-Vout≦6V，the device is guaranteed to regulate if the output current is greater than 10mA.

Detailed Description

ACE1085 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 3.2A.

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 Circuit

ACE1085 has an adjustable version and fixed versions, Chart 1 is its typical application.

Vin

ACE1085

Vout

Vin

Vout

ADJ

R1

125 ohm

10uF

22uF

Tan

Tan

R2

Vout=Vref * (1+R2/R1)+Iadj * R2