PD-94468A
Ultra Low Dropout
Linear Regulator
Hermetic Package
Product Summary
Part Number
OM8503SC
OM8503SF
Dropout
0.4 V
0.4 V
I
O
3.0A
3.0A
Vin
7.4V
7.4V
Vout
6.8V
6.8V
OM8503SC
OM8503SF
+7.4Vin to +6.8Vout at 3.0A
Package
MO-078AA
8-lead Flatpack
MO-078AA
Features:
The OM8503 is an ultra low dropout linear regulator de-
signed specifically for hi-rel applications. Housed in
either a 5 pin through hole or 8 lead surface mount pack-
age these regulators provide high reliability in military/
defense applications. The ultra low dropout voltage of 0.4V
@ 3A makes the part particularly useful for applications
requiring low noise and higher efficiency.
n
Ultra low dropout voltage of 0.4 volt sig-
n
n
n
n
nificantly reduces power consumption
Low noise, higher efficiency
Remote shutdown permits power
sequencing to be easily implemented
Hermetic MO-078AA (TO-258AA) and 8-
lead flat pack ensure higher reliability
Available H-level screened
Absolute Maximum Ratings
Symbol
Io
V in
P
TOT
RTHJC
R
THJC
TJ
TSTG
T
L
Parameter
Output Current
Input Voltage
Power Dissipation TC=25
o
C
Thermal Resistance, Junction to Case (MO-078AA)
Thermal Resistance, Junction to Case (8 lead flatpack)
Operating Junction
Storage Temperature Range
Lead Temperature
Value
3.5
+8.0
19
6.5
6.5
-55 to +125
-65 to +150
300
Units
A
V
W
°C/W
°C/W
o
C
o
C
o
C
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1
8/20/02
OM8503SC, OM8503SF
Electrical Characteristics
@ T
A
= 25°C (Unless Otherwise Specified)
Parameter
Output Voltage
Input Voltage Range-
Operating
Line Regulation
Load Regulation
Dropout Voltage
Current Limit
Ripple Rejection
Shutdown Source Current
Shutdown Pin Threshold
Output Voltage at Shutdown
Conditions
Vin= 7.4V, Io= 3.0A
Io= 3.0A
7.1
≤
Vin
≤
7.7, Io= 3.0A
6.7
≤
Vin
≤
8.1, Io= 50mA
Vin= 7.4V
10ma
≤
Iout
≤
3.0A
Io= 3.0A. Vout= 6.8V
Vin= 7.4V, Overcurrent
Latchup
F= 120 Hz., Vout= Vref
Vshdn= 5V
Isource= 200uA
Vin= 7.4V, Io= 50mA,
Shdn= +5.0V
Symbol
Vout
Min.
6.732
7.2
-100
-5
-20
Typ.
6.8
Max
6.868
8.0
+100
+5
+20
0.4
3.0
65
Ishdn
Vshdn
Vout
(shdn)
200
1.0
-0.1
1.6
+0.1
Unit
V
V
mV
mV
mV
V
A
dB
uA
V
V
Vline
Vload
Vdrop
Ilatch
Electrical Characteristics
T
A
= -55 to +125°C
Parameter
Output Voltage
Input Voltage Range-
Operating
Line Regulation
Load Regulation
Dropout Voltage
Current Limit
Ripple Rejection
Shutdown Source Current
Shutdown Pin Threshold
Output Voltage at Shutdown
Conditions
Vin= 7.4V, Io= 3.0A
Io= 3.0A
7.1
≤
Vin
≤
7.7, Io= 3.0A
6.7
≤
Vin
≤
8.1, Io= 50mA
Vin= 7.4V
10ma
≤
Iout
≤
3.0A
Io= 3.0A. Vout= 6.8V
Vin= 7.4V, Overcurrent
Latchup
F= 120 Hz., Vout= Vref
Vshdn= 5V
Isource= 200uA
Vin=7.4V, Io= 50mA,
Shdn= +5.0V
Symbol
Vout
Min.
6.46
7.2
-150
-150
-150
Typ.
6.8
Max
7.14
8.0
+150
+150
+150
0.4
3.0
65
Ishdn
Vshdn
Vout
(shdn)
200
1.0
-0.1
1.6
+0.1
Unit
V
V
mV
mV
mV
V
A
dB
uA
V
V
Vline
Vload
Vdrop
Ilatch
Simplified Schematic
Vin
Vout
Drive
Shutdown
Gnd
Ground
2
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OM8503SC, OM8503SF
OM8503 Ripple Rejection vs. Frequency
120
100
80
(db)
60
40
20
0
100
3A
1.5A
.75A
.50A
1,000
10,000
Frequency (Hz)
100,000
1,000,000
Vin
Vin
Vout
Vout
OM8503
100uF 16V
Tantalum
SHDN
GND
1.0uF
Ceramic
X7R
220uF 6.3V
Tantalum
Ground
In order to maintain regulation and stability speci-
fied additional input and output bulk capacitors are
recommended. Capacitors recommended above
should be low ESR tantalums with tolerances of +/
- 20% max. Internal to the product are a 4.7uF input
capacitor and a 4.7uF output capacitor in parallel
with a 0.33uF ceramic capacitor.
Shutdown:
The regulator can be shutdown by apply-
ing a voltage >1.6V to pin 4. The regulator will restart
when the SHDN pin is pulled below the shutdown
threshold of 1.0V. If remote shutdown is not required,
pin 4 shold be connected to GND to insure a safe
“off” state.
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3
OM8503SC, OM8503SF
Mechanical Outline MO-078AA
Base:
GLIDCOP
Pins:
Copper core, Alloy 52
Seals:
Glass
Base
Pin Connections
Terminal
Description
1
Vin
2
GND
3
Vout
4
Shutdown
5
No Connection
1 2 3 4 5
Mechanical Outline 8-Lead Flat Pack
Base:
1010-1018 C.R.S.
Pins:
#52 Alloy, Copper Cored
Seals:
Glass – 9013 or Equiv.
Finish:
100-250 Microinches
Electroless Nickel Over 50-250
Microinches Electrolytic Nickel.
Pin Connections
Terminal
Description
1,2
GND
3
Shutdown
4
No Connection
5,6
Vout
7,8
Vin
0.755
0.745
0.755
0.745
8X 0.080
0.070
8 7 6 5
1 2 3 4
0.110
8x
0.150
0.105
0.225
0.305
0.295
0.095
0.180
0.165
0.040
0.065
0.040
0.065
8X 0.020
0.016
4
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OM8503SC, OM8503SF
Part Number Nomenclature
OM
Omnirel
8503
Device
X
X
X
Screening
S=Isolated
Package
N=Non-Isolated
Part Number
OM8503SCP
OM8503SCH
OM8503SFP
OM8503SFH
Package Description
MO-078AA 5 - Lead
MO-078AA 5 - Lead
8 -Lead Flat Pack
8 -Lead Flat Pack
Screening
100% Final Electrical
Class H per MIL-PRF-38534
100% Final Electrical
Class H per MIL-PRF-38534
MIL-PRF-38534 Screening Requirements
TEST/INSPECTION
SCREENING LEVEL MIL-STD-883
Class H
Method
Pre Seal Burn-In
Nondestructive Bond Pull
Internal Visual
Temperature Cycle
Constant Acceleration
Mechanical Shock
PIND
Pre Burn-In Electrical
Burn-In
Final Electrical
Seal
Radiographic
External Visual
Optional
N/A
100%
100%
100%
100%
N/A
Optional
100%
100%
100%
N/A
100%
1030
2023
2017
1010
2001
2002
2020
1015
1014
2012
2009
WORLD HEADQUARTERS:
233 Kansas St., El Segundo, California 90245, Tel: (310) 2527105
IR LEOMINSTER:
205 Crawford St., Leominster, Massachusetts 01453, Tel: (978) 5345776
Data and specifications subject to change without notice.
8/2002
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5
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