SG79xxA / SG79xx
TM
®
Negative Fixed Voltage Regulator
P
RODUCT
D
ATASHEET
DESCRIPTION
The SG79xxA/SG79xx series of negative
regulators offer self-contained, fixed-
voltage capability with up to 1.5A of load
current and input voltage up to -30V. With
a variety of output voltages this regulator
series is an optimum complement to the
SG7800A/SG7800 positive three terminal
regulators.
These units feature a unique band gap
reference which allows the SG79xxA
series to be specified with an output
voltage tolerance of ±1.5%.
The SG79xxA versions also offer much
improved line regulation characteristics.
All protective features of thermal
shutdown, current limiting, and safe-area
control have been designed into these units
and since these regulators require only a
single output capacitor (SG79xx series) or a
capacitor and 5mA minimum load (SG120
series) for satisfactory performance, ease of
application is assured.
Although designed as fixed-voltage
regulators, the output voltage can be
increased through the use of a simple
voltage divider. The low quiescent drain
current of the device insures good regulation
when this method is used.
These devices are available in
hermetically sealed TO-257 (both case
grounded ‘G’ and isolated ‘IG’), TO-3, TO-
39 and LCC packages.
KEY FEATURES
Output Voltage Set Internally to
±1.5% on SG79xxA
Output Current to 1.5A
Excellent Line and Load Regulation
Foldback Current Limiting
Thermal Overload Protection
Voltages Available: -5V, -12V, -15V
Contact Factory for Other Voltage
Options
Available in Surface Mount Package
HIGH RELIABILITY FEATURES
- SG79xxA/SG79xx
Available to MIL-STD - 883,
¶ 1.2.1
MIL-M38510/11501BXA - JAN7905T
MIL-M38510/11505BYA - JAN7905K
MIL-M38510/11502BXA - JAN7912T
MIL-M38510/11506BYA - JAN7912K
MIL-M38510/11503BXA - JAN7915T
MIL-M38510/11507BYA - JAN7915K
MIL-M38510/11508BYA - JAN7924K
MSC-AMSG level "S" Processing Available
Available to DSCC
– Standard Microcircuit Drawing (SMD)
WWW .
Microsemi
.C
OM
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
SG79
XX
SG79
XX
Copyright
©
1997
Rev. 1.6, 2010-07-16
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
SG79xxA / SG79xx
TM
®
Negative Fixed Voltage Regulator
P
RODUCT
D
ATASHEET
ABSOLUTE MAXIMUM RATINGS
Device Output Voltage
-5V
-12V
-15V
Input Voltage
-35V
-35V
-40V
Input Voltage Differential
(Output Shorted to Ground)
35V
35V
35V
WWW .
Microsemi
.C
OM
Operating Junction Temperature .........................................................................................................................................................150°C
Storage Temperature Range ................................................................................................................................................. -65°C to 150°C
Lead Temperature (Soldering 10 seconds) ..........................................................................................................................................300°C
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of
specified terminal
.
THERMAL DATA
K
TO-3 3-Pin Metal Can
3.0°C/W
35°C/W
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
θ
JC
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
T
TO-39 3-Pin Metal Can
15°C/W
120°C/W
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
θ
JC
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
G
TO-257 3-Pin Hermetic
3.5°C/W
42°C/W
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
θ
JC
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
IG
TO-257 3-Pin Hermetic (Isolated)
4.0°C/W
42°C/W
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
θ
JC
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
L
Leadless Chip Carrier 20-Pin Ceramic
35°C/W
120°C/W
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
θ
JC
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
Copyright
©
1997
Rev. 1.6, 2010-07-16
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
SG79xxA / SG79xx
TM
®
Negative Fixed Voltage Regulator
P
RODUCT
D
ATASHEET
APPLICATIONS
WWW .
Microsemi
.C
OM
Figure 9 –
Fixed Output Regulator
Note:
Figure 10 –
Circuit for Increasing Output Voltage
1. C1 is required only if regulator is separated from
Note: C3 optional for improved transient response and ripple
rectifier filter.
rejection.
2. Both C1 and C2 should be low E.S.R. types such
R
1
+
R
2
as solid tantalum. If aluminum electrolytic
V
OUT
=
V REGULATOR
R
1
capacitors are used, at least 10 times values
shown should be selected.
V REG
3. If large output capacities are used, the regulators
R
2
=
must be protected from momentary input shorts. A
15mA
high current diode.
(
)
(
)
RECOMMENDED OPERATING CONDITIONS
Parameter
Operating Junction Temperature Range (Note 2)
Note 2: Range over which the device is functional.
SG79xx / 79xxA
Min
Typ
Max
-55
150
Units
°C
A
PPLICATIONS
Copyright
©
1997
Rev. 1.6, 2010-07-16
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
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