PD-94470A
Ultra Low Dropout Positive
Adjustable Linear Regulator
Hermetic Package
Product Summary
Part Number
OM8505SC
OM8505SF
Dropout
0.4 V
0.4 V
I
O
3.0A
3.0A
OM8505SC
OM8505SF
+5.0Vin / +4.1 to +5.1Vout at 3.0A
Vin
Package
5.0V
MO-078AA
5.0V 8-lead Flatpack
MO-078AA
Features:
The OM8505 is an ultra low dropout adjustable linear regu-
lator designed specifically for hi-rel applications. Housed
in either a 5 pin through hole or 8 lead surface mount
package, these regulators provide high reliability in mili-
tary/defense applications. The ultra low dropout voltage of
0.4V @ 3A makes the part particularly useful for applica-
tions requiring low noise and higher efficiency.
n
Ultra low dropout voltage of 0.4 volt
significantly reduces power consumption
n
Low noise, higher efficiency
n
Remote shutdown permits power
sequencing to be easily implemented
n
Hermetic MO-078AA (TO-258AA) and 8-
lead flat pack ensure higher reliability
n
Available H-level screened
Absolute Maximum Ratings
Symbol
Io
V in
Vout
P
TOT
RTHJC
R
THJC
TJ
TSTG
T
L
Parameter
Output Current
Input Voltage
Output Voltage Range
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
+7.0
+4.1 to +5
19
6.5
6.5
-55 to +125
-65 to +150
300
Units
A
V
V
W
°C/W
°C/W
o
C
o
C
o
C
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1
8/20/02
OM8505SC, OM8505SF
Electrical Characteristics
@ T
A
= 25°C (Unless Otherwise Specified)
Parameter
Input Voltage Range-
Operating
Reference Voltage
Line Regulation
Load Regulation
Dropout Voltage
Current Limit
Ripple Rejection
Shutdown source current
Shutdown Pin Threshold
Output Voltage at Shutdown
Conditions
Io= 3.0A
Symbol
Min.
4.5
1.252
-100
-5
-20
Typ.
Max
6.5
1.305
+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
4.75
≤
Vin
≤
5.25, Io= 3.0A
4.5
≤
Vin
≤
5.5, Io= 50mA
Vin= 5.0V
10ma
≤
Iout
≤
3.0A
Io= 3.0A. Vin= 5.0V
Vin= 5.0V, Overcurrent
Latchup
F= 120 Hz., Vout= Vref
Vshdn= 5V
Isource= 200uA
Vin= 5.0V, Io= 50mA,
Shdn= +5.0V
Vref
Vline
Vload
Vdrop
Ilatch
1.265
Electrical Characteristics
T
A
= -55 to +125°C
Parameter
Input Voltage Range-
Operating
Reference Voltage
Line Regulation
Load Regulation
Dropout Voltage
Current Limit
Ripple Rejection
Shutdown Source Current
Shutdown Pin Threshold
Output Voltage at Shutdown
Conditions
Io= 3.0A
Symbol
Min.
4.5
1.225
-150
-150
-150
Typ.
Max
6.5
1.305
+150
+150
+150
0.4
3.0
65
Ishdn
Vshdn
Vout
(shdn)
Vout
Unit
V
V
mV
mV
mV
V
A
dB
uA
V
V
4.75
≤
Vin
≤
5.25, Io= 3.0A
4.5
≤
Vin
≤
5.5, Io= 50mA
Vin= 5.0V
10ma
≤
Iout
≤
3.0A
Io= 3.0A. Vin= 5.0V
Vin= 5.0V, Overcurrent
Latchup
F= 120 Hz., Vout= Vref
Vshdn= 5V
Isource= 200uA
Vin= 5.0V, Io= 50mA,
Shdn= +5.0V
Vref
Vline
Vload
Vdrop
Ilatch
1.265
200
1.0
-0.1
1.6
+0.1
Simplified Schematic
Vin
Drive
Adjust
Ground
Shutdown
Gnd
2
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OM8505SC, OM8505SF
OM8505 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
Adjust
Resistor
Vin
Vout
R1
220uF 6.3V
SHDN
GND
ADJ
1.0uF
Ceramic
X7R
Tantalum
OM8505
100uF 16V
Tantalum
Vout = Vref x (1+R1/1000)
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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OM8505SC, OM8505SF
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
Adjust
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.
Pin Connections
Terminal
Description
1,2
GND
3
Shutdown
4
Adjust
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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OM8505SC, OM8505SF
Part Number Nomenclature
OM
Omnirel
8505
Device
X
X
X
Screening
S=Isolated
Package
N=Non-Isolated
Part Number
OM8505SCP
OM8505SCH
OM8505SFP
OM8505SFH
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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