SG137A/SG137
500mA Negative Adjustable Regulator
Description
The SG137A family of negative adjustable regulators
deliver up to 500mA output current over an output
voltage range of -1.2 V to -37 V. The device includes
significant improvements, such as better line and load
regulation, and a maximum output voltage error of 1%.
The SG137 family uses the same chip design and
guarantees maximum output voltage error of ±2%.
Every effort is made to make these devices easy to use
and difficult to damage. Internal current and power
limiting coupled with true thermal limiting prevents
device damage due to overloads or shorts even if the
regulator is not fastened to a heat sink.
The SG137A/137 family of products are ideal
complements to the SG117A/117 adjustable positive
voltage regulators.
Features
1% Output Voltage Tolerance
0.01%/V Line Regulation
0.5% Load Regulation
0.02%/W Thermal Regulation
High Reliability Features -
SG137A/SG137
Available to MIL-STD-883
MSC-AMS Level "S" Processing Available
Available to DSCC
– Standard Microcircuit Drawing (SMD)
SGR137A/SGR137 Rad-Tolerant Version
Available
Typical Application
R2*
+ C
2
5
µF
SOLID
TANTALUM
ADJ
-V
IN
V
IN
+ C
3
1
µF
SOLID
TANTALUM
R1
121W
SG137A
V
OUT
*R2 = R1(│V
OUT
│/1.25V-1)
-V
OUT
= 1.25 V (1+R2/R1)
Figure 1 ·
Typical Application
December 2014 Rev. 1.2
www.microsemi.com
© 2014 Microsemi Corporation- Analog Mixed Signal
1
500mA Negative Adjustable Regulator
12
11
10
9
OUTPUT VOLTAGE ERROR (%)
8
2% RESISTORS
7
6
1% RESISTORS
5
2% RESISTORS
4
1% RESISTORS
3
2
1
SG137A
SG137
2
4
6
10
20
40
100
OUTPUT VOLTAGE
Figure 2 ·
Resistor Precision vs. Output Voltage Error
Connection Diagrams and Ordering Information
Ambient
Temperature
Type
Package
Part Number
SG137AT-883B
SG137AT-DESC
-55°C to
125°C
3-Terminal
Metal Can
SG137AT
TO-39
SG137T-883B
SG137T-DESC
SG137T
3
2
1 20 19
18
17
16
15
14
1. V
OUT
*
2. V
OUT
*
3. N.C.
4. N.C.
5. N.C.
6. N.C.
7. N.C.
8. N.C.
9. N.C.
10. N.C.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
V
IN
N.C.
N.C.
N.C.
N.C
ADJ
N.C
N.C
N.C
N.C
Packaging
Type
Connection Diagram
ADJ
1
T
2
V
OUT
3
V
IN
CASE IS V
IN
SG137AL-883B
4
SG137AL-DESC
-55°C to
125°C
20-Pin
CERAMIC
Leadless Chip
Carrier
SG137AL
CLCC
SG137L-883B
SG137L-DESC
SG137L
5
6
7
8
L
9 10 11 12 13
L PACKAGE
(Top View)
PbSn Lead Finish
* Both V
OUT
pins must be externally
connected together at the device terminals.
2
Absolute Maximum Ratings1
Absolute Maximum Ratings1
Parameter
Power Dissipation
Input to Output Voltage Differential
Storage Temperature Range
Operating Junction Temperature
Lead Temperature (Soldering, 10 Seconds)
Value
Internally Limited
40
-65 to 150
150
300
Units
-
V
°C
°C
ESD Rating (Human Body Model)
2
Notes:
1.
Stresses above those listed in "ABSOLUTE MAXIMUM RATINGS", may cause permanent damage to the device. This is a
stress only rating and operation of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. All voltages are with respect to Ground. Currents are positive into, negative out
of specified terminal.
°C
kV
Thermal Data
Parameter
T Package:
Thermal Resistance-Junction to Leads, θ
JC
Thermal Resistance-Junction to Ambient, θ
JA
L Package:
Thermal Resistance-Junction to Leads, θ
JC
35
°C/W
°C/W
Thermal Resistance-Junction to Ambient, θ
JA
120
Notes:
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x θ
JA
).
The above numbers for θ
JC
are maximums for limiting the thermal resistance of the package in a standard mounting
configuration. The θ
JA
numbers are the guidelines for the thermal performance of the device/pcboard system. All of the above
assume no ambient airflow.
15
120
°C/W
°C/W
Value
Units
Recommended Operating Conditions
2,3
Symbol
Parameter
Recommended Operating Conditions
Min
V
OUT
Input Voltage Range
Operating Junction Temperature Range
SG137A/137
Note:
2.
Range over which the device is functional.
3.
These ratings are applicable for junction temperatures of less than 135°C.
-(│V
OUT
│+3.5V)
-55
Typ
Units
V
°C
Max
-36
150
3
500mA Negative Adjustable Regulator
Electrical Characteristics
Unless otherwise specified, these specifications apply over full operating ambient temperatures for
SG137A/SG137 with -55°C ≤ T
J
≤ 150°C, |V
IN
- V
OUT
| = 5.0V, and for I
OUT
= 100mA. Although power
dissipation is internally limited, these specifications are applicable for power dissipations of 2W, and I
MAX
=
0.5A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures
equal to the ambient temperature.
Symbol
Test Conditions
Min.
I
OUT
= 10mA, T
J
= 25°C
SG137A
Typ.
Max
Min.
SG137
Typ.
Max
Units
V
V
-1.238 -1.250 -1.262 -1.225 -1.250 -1.275
-1.220 -1.250 -1.280 -1.200 -1.250 -1.300
Reference Voltage
6
3V ≤ |V
IN
- V
OUT
| ≤ 40V, 10mA ≤ I
OUT
≤ I
MAX
3V ≤ |V
IN
- V
OUT
| ≤ 40V, I
OUT
≤ I
MAX
Line Regulation
4,6
T
J
= 25°C
10mA ≤ I
OUT
≤ I
MAX
|V
OUT
| ≤ 5V, T
J
= 25°C
Load Regulation
4
0.005
0.01
0.01
0.02
%/V
5
0.1
10
0.2
0.002
25
0.5
50
1
0.02
15
0.3
20
0.3
0.002
25
0.5
50
1
0.02
mV
%
mV
%
%/W
|V
OUT
| ≥ 5V, T
J
= 25°C
|V
OUT
| ≤ 5V
|V
OUT
| ≥ 5V
Thermal Regulation
5
T
J
= 25°C, 10ms pulse
V
OUT
= -10V, f =120Hz
Ripple Rejection
C
ADJ
= 0, T
J
= 25°C
C
ADJ
= 10µF
60
70
66
80
65
1.0
0.2
2.5
1.2
100
5
2
5.0
3
1.5
0.5
0.5
0.15
66
60
77
65
2
0.5
2.5
1.2
0.8
0.25
100
5
5
5.0
3.0
dB
dB
µA
µA
µA
mA
mA
A
A
Adjust Pin Current
Adjust Pin Current
6
Change
T
A
= 25°C
3V ≤ |V
IN
- V
OUT
| ≤ 40V
10mA ≤ I
OUT
≤ I
MAX
|V
IN
- V
OUT
| ≤ 40V
|V
IN
- V
OUT
| ≤ 10V
|V
IN
- V
OUT
| ≤ 15V
|V
IN
- V
OUT
| ≤ 40V, T
J
= 25°C
0.5
0.15
Minimum Load
Current
Current Limit
0.8
0.25
4
Electrical Characteristics
Electrical Characteristics
Unless otherwise specified, these specifications apply over full operating ambient temperatures for
SG137A/SG137 with -55°C ≤ T
J
≤ 150°C, |V
IN
- V
OUT
| = 5.0V, and for I
OUT
= 100mA. Although power
dissipation is internally limited, these specifications are applicable for power dissipations of 2W, and I
MAX
=
0.5A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures
equal to the ambient temperature.
SG137A
Symbol
Test Conditions
Min.
Temperature Stability
Long Term Stability
5
5
SG137
Units
Max
1.5
1
Min.
Typ.
0.6
0.3
0.003
1
Max
%
%
%
Typ.
0.6
T
J
= 125°C, 1000 Hours
T
J
= 25°C, 10Hz ≤ f ≤ 10kHz
5
0.3
0.003
RMS Output Noise (%
of V
OUT
)
Notes:
4.
Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage
due to heating effects are covered under the specification for thermal regulation.
5.
These parameters, although guaranteed, are not tested in production
6.
I
MAX
is V
IN
- V
OUT
= 3V / 500mA and V
IN
- V
OUT
= 40V / 150mA.
5
