ACE1085
Technology
Description
3A Low Dropout Linear Regulator
ACE1085 is a series of low dropout three terminal regulators with a dropout of 1.3V at 3A load current.
Other than a fixed version (Vout＝1.8V,2.5V,3.3V,5.0V）, ACE1085 has an adjustable version, The
adjustable version can set the output voltage with two external resistors.
ACE1085 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％.
The ACE1085 series is available in standard packages of TO-263-2L, TO-263-3L, TO-220 and TO-252.
Features
●
Other than a fixed version and an adjustable version, output value can be customized on command.
●
Maximum output current is 3A
●
Output voltage accuracy is within
±2％
（±1％
Customized）
●
Range of operation input voltage: Max 18V
●
Line regulation: 0.2％ (Typical)
●
Load regulation: 0.2％ (Typical)
●
Environment Temperature: -50℃~140℃
Application
●
Power Management for Computer Mother Board, Graphic Card
●
Battery Charger
●
Post Regulators for Switching Supplies
●
Microprocessor Supply
Absolute Maximum Ratings
Parameter
Input voltage
Junction temperature
Environment Temperature
Storage temperature
Symbol
V
IN
T
J
T
A
T
S
Max
Unit
18
V
O
150
C
O
140
C
O
- 65 to 150 C
Packaging Type
TO-220
TO-263-3L
TO-263-2L
TO-252
1
2
3
1
2
3
1
2
3
1
2
3
VER 1.2
1
ACE1085
Technology
Fixed Version
Pin Symbol Definition
1
GND
Ground
2
Vout
Output
3
Vin
Input
3A Low Dropout Linear Regulator
Adjustable Version
Pin Symbol Definition
1
ADJ
Adjustable
2
Vout
Output
3
Vin
Input
Ordering information
Selection Guide
ACE1085 XX XX +
H
Halogen - free
Pb - free
1WM : TO-263-2
2WM : TO-263-3L
YM : TO-252
ZM : TO-220
Output Voltage :
1.8V / 2.5V ….. 5.0V / Default: Adjustable Version
Block Diagram
Recommended Work Conditions
Item
Min Nom Max Unit
Input Voltage Range
18
V
Environment Temperature -50
140
℃
VER 1.2
2
ACE1085
Technology
Electrical Characteristics
3A Low Dropout Linear Regulator
TJ=25℃
Parameter
Reference
Voltage
Symbol
Vref
Test Conditions
Iout=10mA,Vin-Vout=3V,
10mA≤Iout≤3A ,1.5V≤Vin-Vout≤5V
ACE1085-1.80V, Iout=0mA,Vin=4.8V,Tj=25℃
10mA≤Iout≤3A ,3.4V≤Vin≤7V
ACE1085-2.50V, Iout=0mA,Vin=4.8V,Tj=25℃
10mA≤Iout≤3A ,4.1V≤Vin≤7V
ACE1085-3.3V,Iout=0mA,Vin=6.3V,Tj=25℃
10mA
≤Iout≤3A
,4.9V≤Vin≤8V
ACE1085-5.0V, Iout=0mA,Vin=8.0V,Tj=25℃
10mA
≤Iout≤3A
,6.6V≤Vin≤10V
ACE1085-ADJ,Iout=10mA , 2.85V≤Vin≤10V
ACE1085-1.8V, Iout=10mA, 3.4V≤Vin≤10V
Min
1.238
1.225
1.782
1.764
2.475
2.45
3.267
3.234
4.95
4.90
Typ
1.25
1.25
1.80
1.80
2.50
2.50
3.3
3.3
5.0
5.0
0.035
1
1
1
1
0.2
3
3
3
3
1.3
Mum Unit
1.262
1.275
1.818
1.836
2.525
2.55
3.333
3.366
5.05
5.10
0.2
5
5
5
5
0.4
15
15
15
15
1.5
V
V
V
V
V
mV
mV
mV
mV
mV
%
mV
mV
mV
mV
V
A
10
10
mV
mV
Output Voltage
Vout
Line Regulation
(Note1)
ΔVout
ACE1085-2.5V, Iout=10mA, 4.1V≤Vin≤10V
ACE1085-3.3V, Iout=10mA, 4.9V≤Vin≤10V
ACE1085-5.0V, Iout=10mA, 6.6V≤Vin≤10V
ACE1085-ADJ, Vin-Vout=3V, 10mA≤Iout≤3A
ACE1085-1.8V, Vin-Vout=3V, 0≤Iout≤3A
Load Regulation
(Note1,2)
ΔVout
ACE1085-2.5V, Vin-Vout=3V, 0≤Iout≤3A
ACE1085-3.3V, Vin-Vout=3V, 0≤Iout≤3A
ACE1085-5.0V, Vin-Vout=3V, 0≤Iout≤3A
Dropout Voltage
(Note3)
Current Limit
Minimum Load
Current (Note4)
Quiescent
Current
Adjust Pin
Current
(Adjustable
Version)
Vin-Vout
ΔVout, ΔVref
=1%，Iout=3A
Vin-Vout=3V, Tj=25℃
3.2
4.5
3
4
llimit
ACE1085-ADJ
Vin=10V
Iq
IAdj
Vin=4.25V,Iout=10mA
45
110
uA
Ripple
Rejection
Adjust Pin
Current Change
Temperature
Stability
Ichange
F=120Hz,Cout=25uF( tan),Iout=3A,Vin-Vout=3V
10mA≤Iout≤3A, 1.5V≤Vin-Vout
≤6V
0.2
5
dB
uA
Iout=10mA, Vin-Vout=1.5V
0.5
%
VER 1.2
3
ACE1085
℃
/W
Technology
Thermal
Resistance
junction to case
TO-252
TO-263
TO-220
3A Low Dropout Linear Regulator
12.5
3
3
θ
JC
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
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.
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).
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
Vin
ACE1085
Vout
ADJ
125 ohm
10uF
Tan
R2
R1
Vout
22uF
Tan
Vout=Vref * (1+R2/R1)+Iadj * R2
VER 1.2
4
ACE1085
Technology
3A Low Dropout Linear Regulator
ACE1085
Typical application of ACE1085
Application Hints
1. Recommend using 10uF tan capacitor as bypass capacitor 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
120Ω~200Ω,the value of CAdj should satisfy this equation: 2*Fripple*CAdj<R1. Recommend using 10uF
tan capacitor.
Output Voltage of Adjustable Version
The ACE1085 adjustable version provide 1.25V Reference Voltage. Any output voltage between
1.25V~13.8V can be available by choosing two external resistors (connection method is shown in chart 1).
In chart 1, R1,R2 is the two external resistors.
Explanation
The output voltage of adjustable version satisfies this followed equation:
Vout=VRef*(1+R2/R1)+IAdj*R2. We can ignore IAdj because IAdj(about 50uA) is much less than the
current of R1(about 4mA).
How to choose R1：The value of R1 should be in the range of 120Ω½200Ω to assure chip working
normally without any load. To assure the electrical performance showed in table 1, the output current
should be larger than 5mA. If R1 is too large, the minimum output current should be larger than 4mA , The
best working condition is to assure that the output current exceeds 10mA.
VER 1.2
5
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