PD-94477A
1 M Rad(Si) Ultra Low Dropout
Linear Regulator
Hermetic Package
Product Summary
Part Number
OMR9603SC
OMR9603SF
Dropout
0.4 V
0.4 V
I
O
3.0A
3.0A
Vin
7.4V
7.4V
Vout
6.8V
6.8V
OMR9603SC
OMR9603SF
+ 7.4Vin to +6.8Vout at 3.0A
Package
MO-078AA
8-pin Flatpack
MO-078AA
Features:
The OMR9603 is a radiation hardened, ultra low dropout
linear regulator designed specifically for space applica-
tions. This product has been characterized to a total ioniz-
ing dose of 1 M Rad (Si) per MIL-STD-883, Method 1019,
Condition A at both high and low dose rates under biased
and unbiased conditions to account for ELDRS effects in
bipolar devices. The ultra low dropout voltage of 0.4V @
3A makes the part particularly useful for applications re-
quiring low noise and higher efficiency.
n
Total dose and low dose capabilitiy to 1M
n
n
n
n
n
Rad(Si) allows use in space applications
Ultra low dropout of 0.4 volt significantly
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
K-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
OMR9603SC, OMR9603SF
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
+150
+150
+150
0.4
3
65
Ishdn
Vshdn
Vout
(shdn)
200
1
-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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OMR9603SC, OMR9603SF
OMR9603 Ripple Rejection vs. Frequency
3A
120
100
80
(db)
60
40
20
0
100
1.5A
.75A
.50A
1,000
10,000
Frequency (Hz)
100,000
1,000,000
Vin
Vin
Vout
Vout
OMR9603
100uF 16V
Tantalum
SHDN
GND
1.0uF
Ceramic
X7R
220uF 6.3V
Tantalum
Ground
In order to maintain regulation and stability specified
additional input and output bulk capacitors are recom-
mended. Capacitors recommended above should be
low ESR tantalums with tolerances of +/- 20% max. In-
ternal 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 ap-
plying a voltage >1.6V to pin 4. The regulator will
restart when the SHDN pin is pulled below the shut-
down threshold of 1.0V. If remote shutdown is not
required, pin 4 shold be connected to GND to in-
sure a safe “off” state.
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3
OMR9603SC, OMR9603SF
Mechanical Outline MO-078AA
Base:
GLIDCOP
Pins:
Copper core, Alloy 52
Seals:
Glass
Pin Connections
Terminal
Description
1
Vin
2
GND
3
Vout
4
Shutdown
5
No Connection
Base
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.
0.755
0.745
0.755
0.745
8X 0.080
0.070
8 7 6 5
Pin Connections
Terminal
Description
1,2
GND
3
Shutdown
4
No Connection
5,6
Vout
7,8
Vin
1 2 3 4
8x
0.105
0.225
0.305
0.295
0.095
0.180
0.165
0.110
0.150
0.040
0.065
0.040
0.065
8X 0.020
0.016
4
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OMR9603SC, OMR9603SF
Part Number Nomenclature
OM
Omnirel
R
Radiation
Hardened/Tolerant
9603
Device
X
X
X
Screening
S=Isolated
Package
N=Non-Isolated
Part Number
OMR9603SCP
OMR9603SCK
OMR9603SFP
OMR9603SFK
Package Description
MO-078AA 5 - Lead
MO-078AA 5 - Lead
8 -Lead Flat Pack
8 -Lead Flat Pack
Screening
100% Final Electrical
Class K per MIL-PRF-38534
100% Final Electrical
Class K per MIL-PRF-38534
MIL-PRF-38534 Screening Requirements
TEST/INSPECTION
SCREENING LEVEL MIL-STD-883
Class K
Method
(Space Level)
Pre Seal Burn-In
Optional
1030
Nondestructive Bond Pull
100%
2023
Internal Visual
100%
2017
Temperature Cycle
100%
1010
Constant Acceleration
100%
2001
Mechanical Shock
100%
2002
PIND
100%
2020
Pre Burn-In Electrical
100%
Burn-In
100%
1015
Final Electrical
100%
Seal
100%
1014
Radiographic
100%
2012
External Visual
100%
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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