PD - 94771
Ultra Low Dropout, 10A
Adjustable Positive Linear Regulator
Surface Mount (SMD-6C)
Product Summary
Part Number
OM7581SM
OM7581SM
5962 - 0323702MXA
Output Voltage
+1.8V to +5.5V
Current
10A
Dropout
0.66V
Description
The OM7581SM is a 10A, ultra low dropout, adjust-
able linear regulator specifically designed for low
voltage, high current applications. Housed in a her-
metic package, the dropout of this device is 660mV
at full load and as low a 100mV at light loads. The
low dropout is achieved by an additional low cur-
rent input voltage. This unit is ideally suited for mili-
tary/defense, commercial aircraft, industrial control
and other harsh environments where a hermetically
sealed package is required.
SMD-6C
Features:
■
Dropout Voltage of 660mV at Full Load
■
Dropout Voltage of 100mV at Light Loads
■
■
■
■
Fast Transient Response
Adjustable Output: 1.8 to 5.5V
Remote Sense
Hermetic SMD-6C Package ensures
High Reliability
Absolute Maximum Ratings
Parameter
Output Currrent
Power Input Voltage
Control 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
PWR
V
CTRL
P
D
R
θJC
T
J
T
STG
T
L
Value
10
6.0
13
20
5.0
-55 to +125
-65 to +150
300
Units
A
V
W
°C/W
°C
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12/03/03
OM7581SM
Electrical Characteristics @T
A
= 25°C (Unless Otherwise Specified)
Parameter
Reference Voltage
V
ADJ
= 0V
Line Regulation
Load Regulation
Ground Pin Current
Adjust Pin Current
V
ADJ
= 0V
Ripple Rejection
Current Limit
Minimum V
CONTROL
Minimum V
PWR
Thermal Regulation
Dropout Voltage
V
CTRL
= V
PWR
= 5.0V (AVG), V
RIPPLE
= 1.0V
P-P
, f= 120Hz
I
OUT
= 4.0A TJ = 25°C
V
CTRL
= 2.75V, V
PWR
= 2.75V,
∆V
OUT
= 100mV, TJ
=
25°C
10.1
V
CTRL
=2.75V, V
PWR
=2.75V,
∆V
OUT
=100mV, TJ=-55°C & TJ=+125°C 10.1
V
PWR
= 3.3V, I
LOAD
= 10A
Q
V
CTRL
= 2.75V, I
LOAD
= 10A, TJ = 25°C
V
CTRL
= 2.75V, I
LOAD
= 10A, TJ = 125°C
V
CTRL
= 2.75V, I
LOAD
=10A, TJ = -55°C
V
PWR
= 5.0V, I
O
= 10A, P
D
≥
20W, pulse width = 30ms
--
--
--
--
--
11
--
--
--
--
--
--
--
--
1.35
0.66
0.85
0.85
0.02
%/W
V
A
60
80
--
dB
Test Conditions
V
CTRL
= 2.7V, V
PWR
= 2.0V, I
LOAD
= 10mA
V
CTRL
=2.7 to 12V, V
PWR
=1.75V to 5.5V, I
LOAD
=10mA to 10A
Q
V
CTRL
= 2.5 to 12V, V
PWR
= 3.0V to 5.5V, I
LOAD
= 1.0mA
Q
V
CTRL
= 2.75V, V
PWR
= 2.75V, I
LOAD
= 10mA to 10A
Q
V
CTRL
= 5.0V, V
PWR
= 3.3V, I
LOAD
= 0mA
Q
V
CTRL
= 2.75V, V
PWR
= 2.05V, I
LOAD
= 10mA
Min. Typ. Max. Units
1.243 1.250 1.257
1.237 1.250 1.263
--
--
--
--
--
--
1.0
1.0
3.0
6.0
--
50
3.0
10
10
10
170
120
µA
mA
V
mV
Minimum Load Current V
CTRL
= 5.0V, V
PWR
= 3.3V, V
ADJ
= 0V
QR
V
Control Pin Current
S
CTRL
= 2.75V, V
PWR
= 2.75V, I
LOAD
= 10A
Q
Dropout is caused by either minimum control voltage or minimum power voltage. Both
parameters are specified with respect to the output voltage. The specifications represent the
minimum input/output voltage required to maintain 1% regulation.
Footnotes
Q
- Denotes specifications which apply over the full operating temperature range.
R
- The minimum load current is minimum current required to maintain regulation. Normally the current in
the resistor divider used to set the output voltage is selected to meet the minimum load current
requirement.
S
- The control pin current is the drive current required for the output transistor. The control pin current is
approximately 0.01% output current. The minimum value is equal to quiescent current of the device.
2
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OM7581SM
Fig 1:
Typical Power Voltage Vs Output Current
Fig 2:
Typical Control Voltage Vs Output Current
Fig 3:
Typical Reference Voltage Vs Temperature
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OM7581SM
3.3V
Pin5
220uF
1uF ( x5 )
0.1uF
V
POWER
Sense
V
OUT
Pin1
Pin3
0.1uF
1uF ( x5 )
330uF
OM7581
5V
V
CONTROL
ADJ
Pin4
22uF
0.1uF
R1
Pin2
V
OUT
= 1.25V(1 + (R2/R1)) + I
ADJ
(R2)
I
ADJ
= 50uA @ 25°C
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.
Specfications for capacitors: 330µF Tantalum Low ESR, 220µF Electrolytic, 22µF Electrolytic
Case Outline and Dimensions
—
SMD-6C
Pin Assignment
Pin #
Pin Description
ADJUST
N/C
SENSE
V
CTRL
V
OUT
V
PWR
1
2
3
4
5
6
6
1
5
2
4
3
Part Numbering Nomenclature
OM
Omnirel
7581
Device
S
S=Isolated
M
Package
X
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.
12/03
4
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