ACE ACE1085481WM+ 3a low dropout linear regulator Datasheet

ACE1085
3A Low Dropout Linear Regulator
Technology
Description
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
Symbol
Input voltage
Junction temperature
Environment Temperature
Storage temperature
VIN
TJ
TA
TS
Max
Unit
18
V
O
150
C
O
140
C
- 65 to 150 OC
Packaging Type
TO-220
TO-263-3L
1
1
2
2
3
TO-263-2L
1
2
3
TO-252
1
2
3
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
3A Low Dropout Linear Regulator
Technology
Electrical Characteristics
TJ=25℃
Parameter
Symbol
Test Conditions
Min
Typ
Mum Unit
Reference
Voltage
Vref
Iout=10mA,Vin-Vout=3V,
10mA≤Iout≤3A ,1.5V≤Vin-Vout≤5V
1.238
1.225
1.25
1.25
1.262
1.275
V
ACE1085-1.80V, Iout=0mA,Vin=4.8V,Tj=25℃
10mA≤Iout≤3A ,3.4V≤Vin≤7V
1.782
1.764
1.80
1.80
1.818
1.836
V
ACE1085-2.50V, Iout=0mA,Vin=4.8V,Tj=25℃
10mA≤Iout≤3A ,4.1V≤Vin≤7V
2.475
2.45
2.50
2.50
2.525
2.55
V
ACE1085-3.3V,Iout=0mA,Vin=6.3V,Tj=25℃
10mA ≤Iout≤3A ,4.9V≤Vin≤8V
3.267
3.234
3.3
3.3
3.333
3.366
V
ACE1085-5.0V, Iout=0mA,Vin=8.0V,Tj=25℃
10mA ≤Iout≤3A ,6.6V≤Vin≤10V
4.95
4.90
5.0
5.0
5.05
5.10
V
ACE1085-ADJ,Iout=10mA , 2.85V≤Vin≤10V
0.035
0.2
mV
ACE1085-1.8V, Iout=10mA, 3.4V≤Vin≤10V
1
5
mV
ACE1085-2.5V, Iout=10mA, 4.1V≤Vin≤10V
1
5
mV
ACE1085-3.3V, Iout=10mA, 4.9V≤Vin≤10V
1
5
mV
mV
Output Voltage
Line Regulation
(Note1)
Load Regulation
(Note1,2)
Dropout Voltage
(Note3)
Vout
ΔVout
ΔVout
Vin-Vout
Current Limit
Minimum Load
Current (Note4)
Quiescent
Current
Adjust Pin
Current
(Adjustable
Version)
Adjust Pin
Current Change
Temperature
Stability
ACE1085-5.0V, Iout=10mA, 6.6V≤Vin≤10V
1
5
ACE1085-ADJ, Vin-Vout=3V, 10mA≤Iout≤3A
0.2
0.4
%
ACE1085-1.8V, Vin-Vout=3V, 0≤Iout≤3A
3
15
mV
ACE1085-2.5V, Vin-Vout=3V, 0≤Iout≤3A
3
15
mV
ACE1085-3.3V, Vin-Vout=3V, 0≤Iout≤3A
3
15
mV
ACE1085-5.0V, Vin-Vout=3V, 0≤Iout≤3A
3
15
mV
ΔVout, ΔVref =1%,Iout=3A
1.3
1.5
V
Vin-Vout=3V, Tj=25℃
llimit
3.2
4.5
A
ACE1085-ADJ
3
10
mV
Iq
Vin=10V
4
10
mV
IAdj
Vin=4.25V,Iout=10mA
45
110
uA
Ripple
Rejection
F=120Hz,Cout=25uF( tan),Iout=3A,Vin-Vout=3V
Ichange
10mA≤Iout≤3A, 1.5V≤Vin-Vout ≤6V
Iout=10mA, Vin-Vout=1.5V
dB
0.2
5
uA
0.5
%
VER 1.2
3
ACE1085
3A Low Dropout Linear Regulator
Technology
Thermal
Resistance
junction to case
TO-252
TO-263
TO-220
θJC
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
Vin
Vout
Vout
ADJ
R1
125 ohm
10uF
Tan
22uF
Tan
R2
Vout=Vref * (1+R2/R1)+Iadj * R2
VER 1.2
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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 120Ω~200Ω 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
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ACE1085
Technology
3A Low Dropout Linear Regulator
Typical Performance Characteristic
Dropout Voltage VS. Output Current
Iout (A)
Reference Voltage VS. Thermal Protection
T (℃)
Load Transient Response
Reference Voltage VS. Temperature
T (℃)
Output Voltage VS. Output Current
Iout (A)
Line Transient Response
VER 1.2
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ACE1085
Technology
3A Low Dropout Linear Regulator
Packing Information
TO-252
VER 1.2
7
ACE1085
Technology
3A Low Dropout Linear Regulator
Packing Information
TO-220
VER 1.2
8
ACE1085
Technology
3A Low Dropout Linear Regulator
Packing Information
TO-263-2L
VER 1.2
9
ACE1085
Technology
3A Low Dropout Linear Regulator
Packing Information
TO-263-3L
VER 1.2
10
ACE1085
Technology
3A Low Dropout Linear Regulator
Notes
ACE does not assume any responsibility for use as critical components in life support devices or systems
without the express written approval of the president and general counsel of ACE Electronics Co., LTD.
As sued herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and shoes failure to perform when properly used in
accordance with instructions for use provided in the labeling, can be reasonably expected to result in
a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can
be reasonably expected to cause the failure of the life support device or system, or to affect its safety
or effectiveness.
ACE Technology Co., LTD.
http://www.ace-ele.com/
VER 1.2
11
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