PD - 94664
Adjustable Positive Linear Regulator
Thru-Hole (TO-257AA)
O M 7 5 8 5 A ST
5962 - 0323703MTA
Product Summary
Part Number
OM7585AST
Output Voltage
+1.5V to +5.5V
Output Current
5.0A
TO-257AA
Description
The OM7585AST is an adjustable positive linear
regulator with a 5A maximum current capability. This
part is specifically designed for low voltage appli-
cations where fast transient response is required.
Utilizing a 3-pin thru-hole package configuration,
these devices are ideally suited for military/aero-
space applications and other harsh environmental
extremes.
Features
n
Fast Transient Response
n
Current Limit Protection
n
Thermal Protection
n
Hermetic TO-257AA Package
n
DSCC Qualified
n
Screened to MIL-PRF-38535
Absolute Maximum Ratings
Parameter
Output Currrent
Input Voltage
Power Dissipation @ Tc = 25°C
Thermal Resistance, Junction to Case
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature Soldering (10second maximum)
Symbol
I
O
V
IN
P
D
R
θJC
T
J
T
STG
T
L
Value
5.0
7.0
26.5
5.0
-55 to +125
-65 to +150
300
Units
A
V
W
°C/W
°C
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1
05/02/03
OM7585AST
Electrical Characteristics -55°C
≤
T
A
≤
125°C (Unless Otherwise Specified)
Parameter
Reference Voltage (
Note 1 )
Line Regulation
( Note 2 )
Symbol
V
REF
V
RLINE
V
RLOAD
V
DROP
I
SC
I
ADJ
I
MIN
HV
IN
/
HV
OUT
V
REG
Test Conditions
V
IN
= 4.25V, I
OUT
= 10mA, 25°C
2.75V
≤
V
IN
≤
7.0V, I
OUT
= 5.0A
2.75V
£
V
IN
£
7.0V, I
OUT
= 10mA
V
IN
= 4.25V, 10mA
£
I
O
£
5.0A, 25°C
V
IN
= 4.25V, 10mA
£
I
O
£
5.0A, -55°C, 125°C
HV
REF
= 1%, I
OUT
= 5.0A
V
IN
= 6.75V
V
IN
= 4.25V, I
OUT
= 10mA
2.75V
£
V
IN
£
7.0V, 10mA
≤
I
OUT
≤
5.0A
2.75V
≤
V
IN
≤
7.0V
f = 120Hz, C
OUT
= 100mF tant,
V
IN
= 4.25V, I
OUT
= 5.0A,
V
IN
= 7.0V, I
OUT
= 5.0A
Pulse Width = 30ms, P
D
= 26.5W
Min.
1.238
1.21
-
-
-
-
5.0
-
-
-
60
-
Max.
1.264
1.275
8.5
17
24
1.4
-
120
5.0
10
200
0.02
Units
V
Load Regulation (
Notes1 & 2 )
Dropout Voltage (
Note 3 )
Current Limit
Adjust Pin Current
Adjust Pin Current (
Note 4
)
Minimim Load Current (
Note 5 )
Ripple Rejection
Thermal Regulation @ 25°C
mV
V
A
µA
mA
dB
%/W
Notes
1.
Low duty cycle pulse testing with Kelvin sense connections is required in order to maintain accurate data. Load
regulation and output voltage are measured at a constant junction temperature.
2.
Line and load regulation are guaranteed up to maximum power dissipation. Power dissipation is determined by input/
output differntial
and the output current. Guraranteed maximum output power will not be available over the full input/
output voltage range.
3.
Dropout voltage is defined as the minimum differential voltage between V
I
N
and V
OUT
required to maintain regulation
at V
OUT
.
It is measured when the output voltage drops 1% below its nominal value.
4. I
FULL LOAD
is defined as the maximum value of output load current as a function of input-to-output voltage.
I
FULL LOAD
is equal to 5A for the OM7585AST. The OM7585AST has a constant current limit with changes
in input-to-output voltage.
5.
Minimum load current is defined as the minimum current required at the output in order for the output voltage to
maintain regulation. The resistor values selected for the voltage divider automatically maintains this current.
2
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OM7585AST
Fig 1:
Typical Dropout Voltage Vs Output Current
Fig 2:
Typical Reference Voltage Vs Temperature
Fig 3:
Typical Minimum Load Current Vs Temperature
Fig 4:
Typical Adjust Pin Current Vs Temperature
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3
OM7585AST
V
IN
IN
OUT
+
C1
10µF
OM7585A
ADJ
I
ADJ
R2
V
REF
R1
+
C2
10µF
V
OUT
V
OUT
= V
REF
(1+R2/R1) + I
ADJ
(R2)
Fig 5:
Typical Application
Layout Consideration
It is recommended that output capacitors be located as close as possible to the V
OUT
terminal of the
device to prevent any high frequency oscillation that may result due to excessive stray inductance.
Case Outline and Dimensions
—
TO-257AA
Package Pin Description
Pin # Pin Symbol
1
2
ADJ
V
OUT
Function
A resistor from this pin to the V
OUT
pin and ground sets the output voltage.
The output of the regulator. A minimum
of 10µF capacitor must be connected
from this pin to ground to ensure stability.
The input pin of the regulator. Typically
a large storage capacitor is connected
from this pin to ground to ensure that the
input voltage does not sag below the
minimum drop out voltage during the
load transient response.
1 2 3
3
V
IN
Part Numbering Nomenclature
OM
Omnirel
7585A
Device
S
S=Isolated
T
Package
M
Screening
WORLD HEADQUARTERS:
233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105
IR LEOMINSTER:
205 Crawford St., Leominster, Massachusetts 01453, Tel: (978) 534-5776
Data and specifications subject to change without notice.
05/03
4
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