AME, Inc.
1
AME1085
3A Low Dropout
Positive Voltage Regulator
!
Typical Application
!
Functional Block Diagram
"
Low dropout voltage
1.2V typically at 3A
"
Adjustable or 3.3V fixed voltage
"
Line regulation typically 0.015%
"
Load regulation typically 0.05%
"
Adjust pin (ADJ) current less than 90
A
"
Overcurrent protection
"
Thermal protection
"
Available in TO-263, TO-252, TO-220
The AME1085 is a 3A low-dropout positive voltage regu-
lator. It is available in fixed and adjustable output voltage
versions. Overcurrent and thermal protection are inte-
grated onto the chip. Output current will limit as it reaches
the pre-set current or temperature limit. At full rated out-
put current the dropout voltage is 1.4V (max.). AME1085
series regulators provide excellent regulation over line,
load and temperature variations.
"
High Efficiency Linear Regulators
"
Post Regulators for Switching Supplies
"
5V to 3.3V Voltage Converter
"
Battery Charger
!
General Description
!
Features
!
Applications
Thermal
Protection
Bandgap
Reference
Current
Limiting
Amplifier
Input
Output
ADJ/GND
Error
Amp.
AME1085
Load
10
F Tan
GND
V
OUT
4.75V to
5.25V
V
IN
10
F Tan
AME, Inc.
3
AME1085
3A Low Dropout
Positive Voltage Regulator
!
Ordering Information
* This differs from our standard part numbering scheme due to historical precedent.
Please consult AME sales office or authorized Rep./Distributor for other voltage accuracy and package type avail-
ability.
Part Number
Marking
Output Voltage Package Operating Temp. Range
AME1085ACBT
AME1085
ACBT
yyww
ADJ
TO-220
0
o
C to 70
o
C
AME1085DCBT
AME1085
DCBT
yyww
3.3
TO-220
0
o
C to 70
o
C
AME1085ACDT-3
AME1085
ACDT-3
yyww
ADJ
TO-263-3
0
o
C to 70
o
C
AME1085DCDT-3
AME1085
DCDT-3
yyww
3.3
TO-263-3
0
o
C to 70
o
C
AME1085ACDT
AME1085
ACDT
yyww
ADJ
TO-263-2
0
o
C to 70
o
C
AME1085DCDT
AME1085
DCDT
yyww
3.3
TO-263-2
0
o
C to 70
o
C
AME1085AMCT
AME1085
AMCT
yyww
ADJ
TO-252-2
0
o
C to 70
o
C
AME1085MCT*
AME1085
MCT
yyww
3.3
TO-252-2
0
o
C to 70
o
C
AME, Inc.
4
3A Low Dropout
Positive Voltage Regulator
AME1085
!
Absolute Maximum Ratings
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
Symbol
Maximum
Unit
V
IN
7
V
TO-220
2.5
TO-263
2.5
TO-252
15
TO-220
50
TO-263
60
TO-252
90
TO-220
3000
TO-252
1200
mW
TO-263
2800
Operating Junction Temperature Range
T
J
0 to 125
Storage Temperature Range
T
STG
- 65 to 150
Lead Temperature (10 Sec)
T
LEAD
260
Internal Power Dissipation
(
T = 100
o
C)
P
D
o
C
Parameter
Input Voltage
Thermal Resistance
(Junction to Case)
o
C/W
JC
Thermal Resistance
(Junction to Ambient)
JA
AME, Inc.
5
AME1085
3A Low Dropout
Positive Voltage Regulator
Parameter
Symbol
Min
Typ Max
Units
Reference voltage
V
IN
= 5V
T
J
=25
o
C
1.238
1.262
(adjustable voltage)
I
O
= 10mA
Over temp.
1.225
1.275
V
IN
= 2.75 - 7V
T
J
=25
o
C
-
0.015 0.2
I
O
= 10mA
Over temp.
-
0.035 0.2
V
IN
= 5V
T
J
=25
o
C
-
0.05
0.3
I
O
= 10mA - 3A
Over temp.
-
0.2
0.4
Dropout voltage
T
J
=25
o
C
-
1.2
1.4
V
OUT
,
V
REF
= 1%
Over temp.
-
1.3
-
Current limit
I
S
3.0
-
-
A
Temperature Coefficient
T
C
-
0.005
-
%/
o
C
Temperature stability
T
S
-
0.5
-
%
Minimum load current
I
O
10
-
-
mA
RMS output noise
V
N
-
0.003
-
%V
0
Ripple rejection ratio
R
A
-
72
-
dB
V
IN
= 5V, I
O
= 3A, Over temp.
T
J
=25
o
C
%
V
D
V
V
IN
= 5V
V
IN
= 2.75 - 7V, Over temp.
V
IN
= 2.75 - 7V, I
O
= 10mA - 3A
I
O
= 10mA - 3A
V
IN
= 5V, I
O
= 500mA, Over temp.
1.250
V
Reg
LINE
%
Load regulation
Reg
LOAD
Test Condition
Line regulation
V
REF
Parameter
Symbol
Min
Typ Max
Units
Output voltage
V
IN
= 5V
T
J
=25
o
C
3.267
3.333
(fixed voltage)
I
O
= 0A
Over temp.
3.234
3.366
V
IN
=4.5 - 7V
T
J
=25
o
C
-
0.015 0.2
I
O
= 0A
Over temp.
-
0.035 0.2
V
IN
= 5V
T
J
=25
o
C
-
0.05
0.3
I
O
= 0A - 3A
Over temp.
-
0.2
0.4
Dropout voltage
V
IN
= 4.5 - 7V
T
J
=25
o
C
-
1.2
1.4
V
OUT
,
V
REF
= 1%
I
O
= 0A - 3A
Over temp.
-
1.3
-
Current limit
I
S
3.0
-
-
A
Quiescent current
(fixed model)
Temperature Coefficient
T
C
-
0.005
-
%/
o
C
Temperature stability
T
S
-
0.5
-
%
RMS output noise
V
N
-
0.003
-
%V
0
Ripple rejection ratio
R
A
60
72
-
dB
V
IN
= 4.5 - 7V, I
O
= 0A - 3A
13
mA
-
12
T
J
=25
o
C
Test Condition
I
Q
V
IN
= 5V, Io=0A - 3A, Over temp.
Load regulation
Reg
LOAD
Line regulation
V
IN
= 5V, I
O
= 500mA, Over temp.
V
IN
= 4.5 - 7V, Over temp.
V
D
V
Vo
3.300
V
Reg
LINE
%
V
IN
= 5V, I
O
= 3A, Over temp.
%
!
Electrical Specifications
AME1085Axxx
AME1085Dxxx
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