SG7900A/SG7900 SERIES
SG7900A/SG7900
NEGATIVE FIXED VOLTAGE REGULATOR
DESCRIPTION
The SG7900A/SG7900 series of negative regulators offer self-contained,
fixed-voltage capability with up to 1.5A of load current. With a variety of
output voltages and four package options this regulator series is an
optimum complement to the SG7800A/SG7800, SG140 line of three
terminal regulators.
These units feature a unique band gap reference which allows the
SG7900A series to be specified with an output voltage tolerance of
±1.5%.
The SG7900A versions also offer much improved line regulation character-
istics.
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 (SG7900 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, especially for the SG120 series.
These devices are available in hermetically sealed TO-257, TO-3, TO-39
and LCC package.
FEATURES
•
•
•
•
•
•
•
•
Output voltage set internally to
±
1.5% on SG7900A
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
- SG7900A/SG7900
♦
Available to MIL-STD - 883
♦
MIL-M38510/11501BXA - JAN7905T
♦
MIL-M38510/11505BYA - JAN7905K
♦
MIL-M38510/11502BXA - JAN7912T
♦
MIL-M38510/11506BYA - JAN7912K
♦
MIL-M38510/11503BXA - JAN7915T
♦
MIL-M38510/11507BYA - JAN7915K
♦
LMI level "S" processing available
SCHEMATIC DIAGRAM
**
**
For normal
operation the (V
OS
)
Sense Pin must be
externally
connected to the
load.
05/01 Rev 1.5
Copyright
1999
1
11861 Western Avenue
∞
Garden Grove, CA 92841
(714) 898-8121
∞
FAX:
(714) 893-2570
L
INFINITY
Microelectronics Inc.
SG7900A/SG7900 SERIES
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Device
Output Voltage
-5V
-12V
-15V
Operating Junction Temperature
Hermetic (K, T, IG & L - Packages) ........................
Note 1. Values beyond which damage may occur.
NEGATIVE REGULATOR
Input Voltage
-35V
-35V
-40V
Input Voltage Differential
(Output shorted to ground)
35V
35V
35V
150°C
Storage Temperature Range .......................... -65°C to 150°C
Lead Temperature (Soldering, 10 Seconds) ................. 300°C
THERMAL DATA
K Package:
Thermal Resistance-
Junction to Case
,
θ
JC
................. 3.0°C/W
Thermal Resistance-
Junction to Ambient
,
θ
JA
............... 35°C/W
T Package:
Thermal Resistance-
Junction to Case
,
θ
JC
.................. 15°C/W
Thermal Resistance-
Junction to Ambient
,
θ
JA
............ 120°C/W
IG Package:
Thermal Resistance-
Junction to Case
,
θ
JC
................. 3.5°C/W
Thermal Resistance-
Junction to Ambient
,
θ
JA
.............. 42°C/W
L Package:
Thermal Resistance-
Junction to Case
,
θ
JC
.................. 35°C/W
Thermal Resistance-
Junction to Ambient
,
θ
JA
............ 120°C/W
Note A. Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
Note B. The above numbers for
θ
JC
are maximums for the limiting thermal
resistance of the package in a standard mounting configuration.
The
θ
JA
numbers are meant to be guidelines for the thermal
performance of the device/pc-board system. All of the above
assume no ambient airflow.
RECOMMENDED OPERATING CONDITIONS
(Note 2)
Operating Junction Temperature Range:
SG7900A/7900 ............................................. -55°C to 150°C
Note 2. Range over which the device is functional.
CHARACTERISTIC CURVES
FIGURE 1.
MAXIMUM AVERAGE POWER DISSIPATION
FIGURE 2.
QUIESCENT CURRENT VS. LOAD
FIGURE 3.
TEMPERATURE COEFFICIENT
05/01 Rev 1.5
Copyright
1999
2
11861 Western Avenue
∞
Garden Grove, CA 92841
(714) 898-8121
∞
FAX:
(714) 893-2570
L
INFINITY
Microelectronics Inc.
SG7900A/SG7900 SERIES
CHARACTERISTIC CURVES
(continued)
NEGATIVE REGULATOR
FIGURE 4.
SHORTCIRCUIT CURRENT VS. V
IN
FIGURE 5.
QUIESCENT CURRENT VS. V
IN
FIGURE 6.
SHORT CIRCUIT CURRENT VS. V
IN
FIGURE 7.
DROPOUT CHARACTERISTICS
FIGURE 8.
RIPPLE REJECTION VS. FREQUENCY
APPLICATIONS
FIGURE 9 - FIXED OUTPUT REGULATOR
FIGURE 10 - CIRCUIT FOR INCREASING OUTPUT VOLTAGE
NOTE: 1. C1 is required only if regulator is separated from rectifier filter.
2. Both C1 and C2 should be low E.S.R. types such as solid
tantalum. If aluminum electrolytics are used, at least 10 times
values shown should be selected.
3. If large output capacities are used, the regulators must be
protected from momentary input shorts. A high current diode
NOTE: C3 optional for improved transient response and ripple rejec
V
OUT
= V (REGULATOR)
R
1
+ R
2
R
1
R
2
=
V(REG)
15mA
05/01 Rev 1.5
Copyright
1999
3
11861 Western Avenue
∞
Garden Grove, CA 92841
(714) 898-8121
∞
FAX:
(714) 893-2570
L
INFINITY
Microelectronics Inc.
SG7900A/SG7900 SERIES
ELECTRICAL SPECIFICATIONS
-5.0V NEGATIVE REGULATOR
(Note 1)
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG7905A/SG7905 with -55°C
≤
T
A
≤
150°C,
V
IN
= -10V, I
O
= 500mA for the K and IG -Power Packages-, I
O
= 100mA for the T and L packages, C
IN
= 2µF, and C
OUT
= 1.0µF. Low duty cycle pulse
testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
SG7905A/SG7905
Parameter
Output Voltage
Line Regulation
(Note 1)
Load Regulation
(Note 1)
Test Conditions
T
J
= 25°C
V
IN
= -7.5V to -25V, T
J
= 25°C
V
IN
= -8V to -12V, T
J
= 25°C
Power Pkgs: I
O
= 5mA to 1.5A, T
J
= 25°C
I
O
= 250mA to 750mA, T
J
= 25°C
T - Pkg: I
O
= 5mA to 500mA, T
J
= 25°C
V
IN
= -8V to -20V
Power Pkgs: I
O
= 5mA to 1.0A, P
≤
20W
T - Pkg: I
O
= 5mA to 500mA, P
≤
2W
Over Temperature Range
T
J
= 25°C
with Line: V
IN
= -8V to -25V
with Load: I
O
= 5mA to 1.0A (Power Packages)
I
O
= 5mA to 500mA (T)
∆V
O
= 100mV, T
J
= 25°C
Power Pkgs: I
O
= 1.0A, T - Pkg: I
O
= 500mA
Power Pkgs: T
J
= 25°C
T - Pkg: T
J
= 25°C
Power Pkgs: V
IN
= -35V, T
J
= 25°C
T - Pkg: V
IN
= -35V, T
J
= 25°C
∆V
IN
= 10V, f = 120Hz, T
J
= 25°C
f = 10Hz to 100KHz
(Note 2)
1000hrs. at T
J
= 125°C
I
O
= 5mA
SG7905A
SG7905
Min. Typ. Max. Min. Typ. Max.
-4.92 -5.00 -5.08 -4.8 -5.0 -5.2
5
25
50
3
3
12
1
25
15
75
100
15
15
25
15
25
5
30
5
100
-4.85 -5.00 -5.15 -4.70 -5.00 -5.30
-4.85 -5.00 -5.15 -4.70 -5.00 -5.30
2.5
2.5
2.0
2.0
1.3
1.3
0.5
0.5
0.5
0.5
1.1
1.5
0.5
2.3
3.3
1.4
1.2
0.6
80
1.1
1.5
0.5
2.3
3.3
1.4
1.2
0.6
80
Units
V
mV
mV
mV
mV
mV
V
V
mA
mA
mA
mA
mA
V
A
A
A
A
dB
µV/V
mV
°C
Total Output Voltage
Tolerance
Quiescent Current
Quiescent Current Change
Dropout Voltage
Peak Output Current
Short Circuit Current
Ripple Rejection
Output Noise Voltage (rms)
Long Term Stability
Thermal Shutdown
54
25
20
175
54
25
20
175
Note 1. All regulation tests are made at constant junction temperature with low duty cycle testing.
2. This test is guaranteed but is not tested in production.
05/01 Rev 1.5
Copyright
1999
4
11861 Western Avenue
∞
Garden Grove, CA 92841
(714) 898-8121
∞
FAX:
(714) 893-2570
L
INFINITY
Microelectronics Inc.
SG7900A/SG7900 SERIES
ELECTRICAL SPECIFICATIONS
-12V NEGATIVE REGULATOR
(Note 1)
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG7912A/SG7912 with -55°C
≤
T
A
≤
150°C,
V
IN
= -19V, I
O
= 500mA for the K and IG -Power Packages-, I
O
= 100mA for the T and L packages, C
IN
= 2µF, and C
OUT
= 1.0µF. Low duty cycle pulse
testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
SG7912A/SG7912
Parameter
Output Voltage
Line Regulation
(Note 1)
Load Regulation
(Note 1)
Test Conditions
T
J
= 25°C
V
IN
= -14.5V to -30V, T
J
= 25°C
V
IN
= -16V to -22V, T
J
= 25°C
Power Pkgs: I
O
= 5mA to 1.5A, T
J
= 25°C
I
O
= 250mA to 750mA, T
J
= 25°C
T - Pkg: I
O
= 5mA to 500mA, T
J
= 25°C
V
IN
= -14.5V to -27V
Power Pkgs: I
O
= 5mA to 1.0A, P
≤
20W
T - Pkg: I
O
= 5mA to 500mA, P
≤
2W
Over Temperature Range
T
J
= 25°C
with Line: V
IN
= -14.5V to -30V
with Load: I
O
= 5mA to 1.0A (Power Packages)
I
O
= 5mA to 500mA (T)
∆V
O
= 100mV, T
J
= 25°C
Power Pkgs: I
O
= 1.0A, T - Pkg: I
O
= 500mA
Power Pkgs: T
J
= 25°C
T - Pkg: T
J
= 25°C
Power Pkgs: V
IN
= -35V, T
J
= 25°C
T - Pkg: V
IN
= -35V, T
J
= 25°C
∆V
IN
= 10V, f = 120Hz, T
J
= 25°C
f = 10Hz to 100KHz
(Note 2)
1000hrs. at T
J
= 125°C
I
O
= 5mA
SG7912A
SG7912
Min. Typ. Max. Min. Typ. Max.
-11.8 -12.0 -12.2 -11.5 -12.0 -12.5
4
60
10
120
3
3
30
60
12
20
90
120
40
4
10
60
10
10
40
240
-11.7 -12.0 -12.3 -11.4 -12.0 -12.6
-11.7 -12.0 -12.3 -11.4 -12.0 -12.6
4
4
3
3
1.0
1.0
0.5
0.5
0.5
0.5
1.1
1.5
0.5
2.3
3.3
1.4
1.2
0.6
80
1.1
1.5
0.5
2.3
3.3
1.4
0.2
0.6
80
Units
V
mV
mV
mV
mV
mV
V
V
mA
mA
mA
mA
mA
V
A
A
A
A
dB
µV/V
mV
°C
Total Output Voltage
Tolerance
Quiescent Current
Quiescent Current Change
Dropout Voltage
Peak Output Current
Short Circuit Current
Ripple Rejection
Output Noise Voltage (rms)
Long Term Stability
Thermal Shutdown
54
25
60
175
54
25
60
175
Note 1. All regulation tests are made at constant junction temperature with low duty cycle testing.
2. This test is guaranteed but is not tested in production.
05/01 Rev 1.5
Copyright
1999
5
11861 Western Avenue
∞
Garden Grove, CA 92841
(714) 898-8121
∞
FAX:
(714) 893-2570
L
INFINITY
Microelectronics Inc.
