OM7900IH Series
OM7900SR Series
ISOLATED HERMETIC TO-257AA FIXED
VOLTAGE NEGATIVE REGULATORS
Three Terminal, Fixed Voltage, 1.5 Amp
Precision Negative Regulators In Hermetic
JEDEC TO-257AA Package and D
2
Pac
FEATURES
•
•
•
•
•
•
Isolated Hermetic Package, JEDEC TO-257AA Outline
Output Voltages: -5V, -12V, -15V (Other Voltages Available)
Output Voltages Set Internally To ±1% or ±2%
Built-In Thermal Overload Protection
Short Circuit Current Limiting
Product Is Available Screened To MIL-STD-883
DESCRIPTION
These three terminal negative regulators are supplied in a hermetically sealed
metal package whose outline is similar to the industry standard TO-220 plastic pack-
age. All protective features are designed into the circuit, including thermal shutdown,
current limiting and safe-area control. With heat sinking, they can deliver over 1.5
amps of output current. These units feature internally trimmed output voltages to ±1%
or 2% of nominal voltage.
Standard voltages are -5V, -12V, and
-15V. However, other voltages are available up to -24 volts. These units are ideally
suited for Military applications where a hermetically sealed package is required.
ABSOLUTE MAXIMUM RATINGS
@ 25°C
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -35 V
Operating Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . - 55°C to + 150°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65°C to + 150°C
Typical Power/Thermal Characteristics:
Rated Power @ 25° C T
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.5W
T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3W
Thermal Resistance
θ
JC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2°C/W
θ
JA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42°C/W
Notes:
Product also available in Non-Isolated construction. To order this version,
delete “I” from part number.
Non-Isolated
Example:
Isolated
OM79XXIH
OM79XXH
Use letter “A” after part number to designate ±1% output voltage tolerance.
Example:
OM7905AIH
0 03 R5
Supersedes 4 11 R4
3.3
3.3 - 1
OM7900IH
OM7900SR
ELECTRICAL CHARACTERISTICS -5
Volt
Parameter
Output Voltage
Symbol
V
OUT
V
RLINE
V
IN
= -10V, I
o
= 500mA, -55°C
≤
T
A
≤
125°C (unless otherwise specified)
Min.
-4.95
Max.
-5.05
-5.15
12
Unit
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
Test Conditions
T
A
= 25°C
V
IN
= -7.5V to -20V
Line Regulation
(Note 1)
V
IN
= -8.0V to -12V
V
IN
= -7.5V to -20V
•
•
•
-4.85
25
5
12
20
Load Regulation
(Note 1)
V
RLOAD
I
O
= 5mA to 1.5 Amp
•
I
O
= 250mA to 750 mA
25
15
•
Standby Current Drain
I
SCD
∆I
SCD
(Line)
∆I
SCD
(Load)
V
DO
I
O (pk)
I
DS
∆V
IN
∆V
OUT
Output Noise Voltage
(Note 3)
Long Term Stability
(Note 3)
∆V
OUT
∆t
T
A
= 25°C, t = 1000 hrs.
N
O
∆V
OUT
= 100mV, I
O
=
1.0A
T
A
= 25°C
V
IN
= -35V
I
O
= 5mA to 1000mA
V
IN
= -7.0V to -20V
30
2.5
Standby Current Drain
Change With Line
Standby Current Drain
Change With Load
Dropout Voltage
Peak Output Current
Short Circuit Current
(Note 2)
Ripple Rejection
•
•
•
•
1.5
3.0
0.4
0.4
mA
2.5
3.3
1.2
V
A
A
A
dB
dB
•
f =120 Hz,
∆V
IN
= -10V
(Note 3)
T
A
= 25°C, f =10 Hz to 100KHz
63
2.8
•
60
40
µV/V
RMS
75
mV
ELECTRICAL CHARACTERISTICS -12 Volt
Parameter
Output Voltage
Symbol
V
OUT
V
RLINE
V
IN
= -19V, I
o
= 500mA, -55°C
≤
T
A
≤
125°C (unless otherwise specified)
Min.
-11.88
Max.
-12.12
-12.36
20
Unit
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
Test Conditions
T
A
= 25°C
V
IN
= -14.5V to -27V
•
•
-11.64
Line Regulation
(Note 1)
V
IN
= -14.5V to -27V
V
IN
= -16V to -22V
50
10
•
Load Regulation
(Note 1)
I
O
= 250mA to 750 mA
V
RLOAD
I
O
= 5mA to 1.5 Amp
30
32
•
•
60
16
30
3.5
Standby Current Drain
I
SCD
∆I
SCD
(Line)
∆I
SCD
(Load)
V
DO
I
O (pk)
I
DS
∆V
IN
∆V
OUT
N
O
∆V
OUT
∆t
∆V
OUT
= 100mV, I
O
=
1.0A
T
A
= 25°C, I
O
= 5mA to 1A
V
IN
= -35V
I
O
= 5mA to 1000mA
V
IN
= -14.5V to -27V
Standby Current Drain
Change With Line
Standby Current Drain
Change With Load
Dropout Voltage
Peak Output Current
Short Circuit Current
•
•
•
•
1.5
4.0
0.8
0.5
mA
1.8
3.3
1.2
V
A
A
A
dB
dB
3.3
(Note 2)
Ripple Rejection
f =120 Hz,
∆V
IN
= -10V
(Note 3)
T
A
= 25°C, f =10 Hz to 100KHz
T
A
= 25°C, t = 1000 hrs.
•
56
2.8
•
53
40
Output Noise Voltage
(Note 3)
Long Term Stability
(Note 3)
µV/V
RMS
120
mV
Notes:
1. Load and Line Regulation are specified at a constant junction temperature. Pulse testing with low duty cycle is used.
Changes in output voltage due to heating effects must be taken into account separately.
2. Short Circuit protection is only assured up to V
IN
= -35V.
3. If not tested, shall be guaranteed to the specified limits.
The • denotes the specifications which apply over the full operating temperature range.
3.3 - 2
OM7900IH Series
OM7900SR Series
ELECTRICAL CHARACTERISTICS -15 Volt
Parameter
Output Voltage
Symbol
V
OUT
V
RLINE
V
IN
= -23V, I
o
= 500mA, -55°C
≤
T
A
≤
125°C (unless otherwise specified)
Min.
-14.85
Max.
-15.15
-15.45
25
Unit
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
Test Conditions
T
A
= 25°C
V
IN
= -17.5V to -30V
Line Regulation
(Note 1)
V
IN
= -20V to -26V
V
IN
= -17.5V to -30V
•
•
•
-14.55
50
15
25
35
Load Regulation
(Note 1)
V
RLOAD
I
O
= 5mA to 1.5 Amp
•
I
O
= 250mA to 750 mA
75
21
•
Standby Current Drain
I
SCD
∆I
SCD
(Line)
∆I
SCD
(Load)
V
DO
I
O (pk)
I
DS
∆V
IN
∆V
OUT
Output Noise Voltage
(Note 3)
Long Term Stability
(Note 3)
∆V
OUT
∆t
T
A
= 25°C, t = 1000 hrs.
N
O
∆V
OUT
= 100mV, I
O
=
1.0A
T
A
= 25°C
V
IN
= -35V
I
O
= 5mA to 1000mA
V
IN
= -17.5V to -30V
45
6.0
Standby Current Drain
Change With Line
Standby Current Drain
Change With Load
Dropout Voltage
Peak Output Current
Short Circuit Current
(Note 2)
Ripple Rejection
•
•
•
•
1.5
6.5
0.8
0.5
mA
2.5
3.3
1.2
V
A
A
A
dB
dB
•
f =120 Hz,
∆V
IN
= -10V
(Note 3)
T
A
= 25°C, f =10 Hz to 100KHz
53
2.8
•
50
40
µV/V
RMS
150
mV
Notes:
1. Load and Line Regulation are specified at a constant junction temperature. Pulse testing with low duty cycle is used.
Changes in output voltage due to heating effects must be taken into account separately.
2. Short Circuit protection is only assured up to V
IN
= -35V.
3. If not tested, shall be guaranteed to the specified limits.
The • denotes the specifications which apply over the full operating temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS
PEAK OUTPUT CURRENT
3.5
3
2.5
1.5
2
T
j
= 25°C
I
OUT
= 500mA
T
j
= -55°C
DROPOUT VOLTAGE
2.5
100
RIPPLE REJECTION
2
I
OUT
= 1A
80
V
OUT
= 5V
60
1.5
1
T
j
= 150°C
1
I
OUT
= 0A
40
V
IN
- V = 8V
DC
+3.5V
rms
I
OUT
= 1A
T
j
= 25°C
0.5
∆V
OUT
= 100MV
0.5
∆V
OUT
= 100mV
20
3.3
10k
100k
0
0
5
10
0
-75 -50 -25
0
25
50 75 100 125 150
0
10
100
1k
Input To Output Differential (V)
Junction Temperature (°C)
Frequency (Hz)
3.3 - 3
OM7900IH Series
OM7900SR Series
TYPICAL APPLICATIONS
Input bypass capacitors are recommended for stable operation of the OM7900 series of regulators over
the input voltage and output current ranges. Output bypass capacitors will improve the transient response
of the regulator.
The bypass capacitors, (2.2µF on the input, 1µF on the output) should be ceramic or solid tantalum which
have good high frequency characteristics. If aluminum electrolytics are used, their values should be 10µF
or larger. The bypass capacitors should be mounted with the shortest leads, and if possible, directly
across the regulator terminals.
Fixed Output Regulator
2
OM79XX
1
+
3
Basic Current Regulator
V
IN
V
OUT
V
IN
2
OM79XX
1
3
2.2µF
1µF
+
2.2µF
I
Q
R1
I
OUT
V
OUT
+ I
Q
I
OUT
=
R1
MECHANICAL OUTLINE
.420
.410
.200
.190
.045
.035
.665
.645
.537
.527
.430
.410
.038 MAX.
PIN CONNECTION
Tab
.150
.140
3.3
.750
.500
.005
OM79XXIH
Isolated
Front View
Pin 1: Ground
Pin 2: Input
Pin 3: Output
Tab: Isolated
1 2 3
OM79XXH
Non-Isolated
Front View
Pin 1: Ground
Pin 2: Input
Pin 3: Output
Tab Input
.035
.025
.100 TYP.
.120 TYP.
Note:
• Case is metal/hermetically sealed
• Isolated Tab
• Outline similar to JEDEC TO-220 outline
OM7900IH Series
OM7900SR Series
MECHANICAL OUTLINE
SOLDERING FOOTPRINT
1 2
3
Pin 1:
Pin 2:
Pin 3:
Case
Ground
Input
Output
N/C
TYPICAL SOLDERING PROFILE
Figure 1 shows a typical soldering profile for the D2 and D3 Packages when soldering a to a printed circuit board. The
profile will vary from system to system and solders to solders. Factors that can affect the profile include the type of sol-
dering system used, density and type of components on the board or substrate material being used. This profile shows
temperature versus time. The two profiles described are based on a high density and a low density board. The type sol-
der used was 62/36/2 Tin Lead Silver with a melting point between 177-189ºC. An convection/infrared soldering reflow
system was used. The circuit and solder joints heat up first due to their mass followed by the components which typi-
cally run 30 degrees cooler than the solder joints.
TYPICAL HEATING PROFILE
PART NUMBER DESIGNATOR
OM
7900
S
R
M
Omnirel
Device
Type
Isolated
Package
Package
Style
Hi-Rel Screening
Level
205 Crawford Street, Leominster, MA 01453 USA (508) 534-5776 FAX (508) 537-4246
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