SG137T Microsemi Analog Mixed Signal Group, SG137T Datasheet - Page 4

• Manufacturer Part Number: SG137T
• Description: IC VOLTAGE REG NEG ADJ TO-39
• Manufacturer: Microsemi Analog Mixed Signal Group

Specifications of SG137T

• Regulator Topology: Negative Adjustable
• Voltage - Output: -1.2 ~ -37 V
• Voltage - Input: Down to -36V
• Number Of Regulators: 1
• Current - Output: 100mA
• Current - Limit (min): 500mA
• Operating Temperature: -55°C ~ 150°C
• Mounting Type: Through Hole
• Package / Case: TO-39
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Voltage - Dropout (typical): -

2/92 Rev 1.1 2/94
Copyright
CHARACTERISTIC CURVES
APPLICATION INFORMATION
OUTPUT VOLTAGE
The output voltage is determined by two external resistors, R
R
The exact formula for the output voltage is:
V
2
OUT
FIGURE 1.
INPUT/OUTPUT DIFFERENTIAL
VS. OUTPUT CURRENT
FIGURE 4. *
OUTPUT VOLTAGE DEVIATION
VS. OUTPUT CURRENT
* The SG137A has load regulation compensation which
(see Figure 7).
makes the typical unit read close to zero. This band
represents the typical production spread.
= V
1994
REF
(
R
2
R
+ R
1
1
)
+ I
FIGURE 6
ADJ
(R
2
)
FIGURE 5.
INPUT/OUTPUT DIFFERENTIAL
VS. OUTPUT CURRENT
FIGURE 2.
REFERENCE VOLTAGE VS. TEMPERATURE
1
&
4
Where: V
In most applications, the second term is small enough to be
ignored, typically about 0.5% of V
tions, the exact formula should be used, with I
Solving for R
Smaller values of R
output voltage, but the no-load current drain on the regulator will
be increased. Typical values for R
giving 12.5 mA and 4.2mA no-load current respectively. There
is an additional consideration in selecting R
current specification of the regulator. The operating current of
R
2
REF
=
=Reference Voltage, I
2
V
yields:
V
R
REF
OUT
1
SG137A/SG137 SERIES
- V
1
and R
+ I
REF
FIGURE 3.
CURRENT VS. INPUT/OUTPUT DIFFERENTIAL
FIGURE 6.
ADJUSTMENT CURRENT VS. TEMPERATURE
ADJ
2
will reduce the influence of I
11861 Western Avenue
1
ADJ
OUT
are between 100 and 300
L
. In more critical applica-
= Adjustment Pin Current.
INFINITY Microelectronics Inc.
[phone]
1
the minimum load
ADJ
Garden Grove, CA 92841
equal to 65 A.
FAX: [phone]
ADJ
on the