LT137A/LM137
LT337A/LM337
Negative Adjustable
Regulator
FEATURES
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DESCRIPTION
The LT
®
137A/LT337A negative adjustable regulators will
deliver up to 1.5A output current over an output voltage
range of –1.2V to –37V. Linear Technology has made
significant improvements in these regulators compared to
previous devices, such as better line and load regulation,
and a maximum output voltage error of 1%.
Every effort has been 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.
Maximum reliability is attained with Linear Technology’s
advanced processing techniques combined with a 100%
burn-in in the thermal limit mode. This assures that all
device protection circuits are working and eliminates field
failures experienced with other regulators that receive only
standard electrical testing.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Guaranteed 1% Initial Voltage Tolerance
Guaranteed 0.01%/V Line Regulation
Guaranteed 0.5% Load Regulation
Guaranteed 0.02%/W Thermal Regulation
100% Burn-in in Thermal Limit
APPLICATIONS
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Adjustable Power Supplies
System Power Supplies
Precision Voltage/Current Regulators
On-Card Regulators
TYPICAL APPLICATION
Negative Regulator
12
R2*
C2
5μF
SOLID
TANTALUM
V
IN
11
C3
1μF
SOLID
TANTALUM
–V
OUT
= 1.25V 1 +
R2
R1
OUTPUT VOLTAGE ERROR (%)
Output Voltage Error
1% RESISTORS
2% RESISTORS
+
+
10
9
8
7
6
5
4
3
2
1
0
1
2
4 6 8 10
20
40
OUTPUT VOLTAGE (V)
100
137A TA01b
ADJ
LT137A V
OUT
R1
121Ω
LM337
–V
IN
LT337A
137A TA01
*R2 = R1
|
V
OUT
|
1.25V
–1
137afb
1
LINER [ LINEAR TECHNOLOGY ]
