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PDF AME1085ACDT-3 Data sheet ( Hoja de datos )
| Número de pieza | AME1085ACDT-3 | |
| Descripción | 3A Low Dropout Positive Voltage Regulator | |
| Fabricantes | Analog Microelectronics | |
| Logotipo |  |
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Analog Microelectronics, Inc.
AME1085
3A Low Dropout
Positive Voltage Regulator
n General Description
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
output current the dropout voltage is 1.4V (max.).
AME1085 series regulators provide excellent regulation
over line, load and temperature variations.
n Key Features
l Low dropout voltage 1.2V typically at 3A
l Adjustable or 3.3V fixed voltage
l Line regulation typically 0.015%
l Load regulation typically 0.05%
l Adjust pin (ADJ) current less than 90υA
l Overcurrent protection
l Thermal protection
l Available in TO-220, TO-263, TO-252
n Applications
l High Efficiency Linear Regulators
l Post Regulators for Switching Supplies
l 5V to 3.3V Voltage Converter
l Battery Charger
n Functional Block Diagram
Input
Current
Limiting
Amplifier
Thermal
Protection
Output
n Typical Application
4.75V to 5.25V
AME1085
VIN VOUT
GND
10µF Tan
10µF Tan L o a d
Error
Amp.
Bandgap ADJ/GND
Reference
Figure 2
Figure 1
1
1 page  
Analog Microelectronics, Inc.
AME1085
3A Low Dropout
Positive Voltage Regulator
n Application Description
1. Output voltage adjustment
Like most regulators, the AME1085 regulates the
output by comparing the output voltage to an
internally generated reference voltage. On the
adjustable version, the VREF is available exter-
nally as 1.25V between VOUT and ADJ. The
voltage ratio formed by R1 and R2 should be
set to conduct 10mA (minimum output load).
The output voltage is given by the following
equation:
VOUT = VREF ( 1 +
R2
R1
) + IADJ x R2
On fixed versions of AME1085, the voltage di-
vider is provided internally.
V IN
C1
IN OUT
ADJ
IADJ
5 0 µA
VREF
VOUT
R1
R2
3. Current limit protection
AME1085 is protected against overload condi-
tions. Current protection is triggered at typi-
cally 4.5A.
4. Stability and load regulation
AME1085 requires a capacitor from VOUT to
GND to provide compensation feedback to the
internal gain stage. This is to ensure stability
at the output terminal. Typically, a 10µF tanta-
lum or 50µF aluminum electrolytic is sufficient.
Note: It is important that the ESR for this ca-
pacitor does not exceed 0.5Ω.
The output capacitor dose not have a theoreti-
cal upper limit and increasing its value will in-
crease stability. COUT = 100µF or more is typi-
cal for high current regulator design.
For the adjustable version, the best load regu-
lation is accomplished when the top of the
resistor divider (R1) is connected directly to the
output pin of the AME1085. When so con-
nected, RP is not multiplied by the divider ratio.
For fixed output versions, the top of R1 is in-
ternally connected to the output and ground
pin can be connected to low side of the load.
VOUT
=
VREF
(1+
R2
R1
)
+
IADJ
x
R2
Figure 3
V IN
2. Thermal protection
AME1085 has thermal protection which limits
junction temperature to 150OC. However, de-
vice functionality is only guaranteed to a maxi-
mum junction temperature of +125OC.
The power dissipation and junction temperature
for AME1085 in TO-220 package are given by
PD = (VIN - VOUT) x IOUT
TJUNCTION = TAMBIENT + ( PD x θJA)
Note: TJUNCTION must not exceed 125OC
RP
Parasitic
Line Resistance
IN OUT
ADJ
R1 RL
(Connect R1 to case)
R2
Connect
R2 to load
Figure 4
5
5 Page 
Analog Microelectronics, Inc.
AME1085
3A Low Dropout
Positive Voltage Regulator
n Package Dimension
TO-252 (DPAK) -EIAJ
SYMBOLS
A
B
C
D
E
F
G
H
I
J
K
L
MILLIMETERS
MIN
MAX
0.45 0.58
1.60 1.95
0.51 -
0.45 0.60
6.40 6.80
5.40 5.80
2.20 2.85
- * 2.30
- 0.90
- 0.97
5.20 5.50
0.89 2.03
INCHES
MIN
MAX
0.0177
0.023
0.06 0.0768
0.02 -
0.0177
0.0236
0.252
0.2677
0.2126
0.2283
0.0866
0.1122
- * 0.0906
- 0.0354
- 0.038
0.20 0.22
0.035
0.08
* : Typical value
NOTES :
1. CONTROLLING DIMENSION : MILLIMETERS.
2. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS
MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE
MATERIAL.
TO-252 (DPAK) JDEC
SYMBOLS
A
B
C
D
E
F
G
H
I
J
K
L
MILLIMETERS
MIN
MAX
0.45 0.58
1.60 1.95
0.51 -
0.45 0.60
6.40 6.80
5.40 5.80
2.20 2.85
- * 2.30
- 0.90
- 0.97
5.20 5.50
0.89 2.03
* : Typical value
INCHES
MIN
MAX
0.0177
0.023
0.06 0.0768
0.02 -
0.0177
0.252
0.2126
0.0866
-
0.0236
0.2677
0.2283
0.1122
* 0.0906
- 0.0354
- 0.038
0.20
0.035
0.22
0.08
NOTES :
1. CONTROLLING DIMENSION : MILLIMETERS.
2. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS
MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE
MATERIAL.
11
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