AME1085ACBT AME, AME1085ACBT Datasheet - Page 8

• Manufacturer Part Number: AME1085ACBT
• Description: Low Dropout (LDO) Regulators Pos. Adj. / 3A LDO
• Manufacturer: AME

Specifications of AME1085ACBT

• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 7 V
• Output Type: Adjustable
• Dropout Voltage (max): 1.4 V
• Output Current: 3 A
• Line Regulation: 0.2 %
• Load Regulation: 0.3 %
• Maximum Operating Temperature: + 125 C
• Mounting Style: Through Hole
• Package / Case: TO-220
• Minimum Operating Temperature: 0 C
• Reference Voltage: 1.262 V
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

AME1085
n Application Description
1. Output Voltage Adjustment
put by comparing the output voltage to an internally gen-
erated reference voltage. On the adjustable version, the
V
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:
provided internally.
2. Thermal Protection
temperature to 150
only guaranteed to a maximum junction temperature of
+125
AME1085 in TO-220 package are given by
8
REF
Like most regulators, the AME1085 regulates the out-
On fixed versions of AME1085, the voltage divider is
AME1085 has thermal protection which limits junction
The power dissipation and junction temperature for
C
V
IN
1
is available externally as 1.25V between V
o
V
C.
OUT
Note: T
= V
P
T
V
JUNCTION
D
OUT
REF
= (V
AME, Inc.
IN
JUNCTION
= V
50 A
( 1 +
IN
I
ADJ
o
= T
C. However, device functionality is
- V
REF
ADJ
must not exceed 125
AMBIENT
OUT
R2
R1
(1+ R2
) x I
) + I
R1
+ ( P
OUT
OUT
) + I
ADJ
D
x R2
ADJ
x
x R2
JA
V
)
REF
o
C
OUT
V
OUT
R1
R2
and
3. Current Limit Protection
Current protection is triggered at typical 4.5A.
4. Stability and Load Regulation
provide compensation feedback to the internal gain stage.
This is to ensure stability at the output terminal. Typi-
cally, a 10 F tantalum or 50 F aluminum electrolytic is
sufficient.
(Note: It is important that the ESR for this capacitor does not ex-
ceed 0.5 .)
limit and increasing its value will increase stability. C
= 100 F or more is typical for high current regulator de-
sign.
accomplished when the top of the resistor divider (R1) is
connected directly to the output pin of the AME1085.
When so connected, R
ratio. For fixed output versions, the top of R1 is internally
connected to the output and ground pin can be connected
to low side of the load.
V
AME1085 is protected against overload conditions.
AME1085 requires a capacitor from V
The output capacitor does not have a theoretical upper
For the adjustable version, the best load regulation is
IN
IN
Positive Voltage Regulator
ADJ
P
OUT
is not multiplied by the divider
3A Low Dropout
(Connect R1 to case)
R2
Line Resistance
R1
R2 to load
Connect
Parasitic
R
P
OUT
to GND to
Rev.N.02
OUT
R
L