FAIRCHILD LM337_10

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LM337
3-Terminal 1.5A Negative Adjustable Regulator
Features
Description
•
•
•
•
•
•
•
The LM337 is a 3-terminal negative adjustable regulator. It
supplies in excess of 1.5A over an output voltage range of
-1.2V to -37V. This regulator requires only two external
resistor to set the output voltage. Included on the chip are
current limiting, thermal overload protection and safe area
compensation.
Output Current in Excess of 1.5A
Output Voltage Adjustable Between -1.2V and -37V
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Output Transistor Safe Area Compensation
Floating Operation for High Voltage Applications
Standard 3-Pin TO-220 Package
TO-220
1
1. Adj 2. Input 3. Output
Internal Block Diagram
Vadj
1
Voltage
Reference
3 Output
+
Protection
Circuitry
2 Input
Rev. 1.0.3
©2010 Fairchild Semiconductor Corporation
LM337
Absolute Maximum Ratings
Parameter
Symbol
Value
Unit
Input-Output Voltage Differential
|VI - VO|
40
V
PD
Internally limited
W
Operating Temperature Range
TOPR
0 ~ +125
°C
Storage Temperature Range
TSTG
-65 ~ +125
°C
Power Dissipation
Electrical Characteristics
(VI - VO = 5V, IO = 40mA, 0°C ≤ TJ ≤ +125°C, PDMAX = 20W, unless otherwise specified)
Parameter
Line Regulation (Note1)
Load Regulation (Note1)
Adjustable Pin Current
Adjustable Pin Current Change
Reference Voltage
Temperature Stability
Minimum Load Current to Maintain
Regulation
Symbol
Rline
Rload
Min.
Typ.
Max.
TA = +25°C
3V ≤ I VI - VO I ≤ 40V
-
0.01
0.04
3V ≤ I VI - VO I ≤ 40V
-
0.02
0.07
TA = +25°C
10mA ≤ IO ≤ 0.5A
-
15
50
10mA ≤ IO ≤ 1.5A
-
15
150
-
50
100
μA
-
2
5
μA
IADJ
ΔIADJ
VREF
STT
IL(MIN)
RMS Noise, % of VOUT
eN
Ripple Rejection Ratio
RR
Long Term Stability
ST
Thermal Resistance Junction to
Case
Conditions
RθJC
TA = +25°C
10mA ≤ IO ≤ 1.5A
3V ≤I VI - VO I ≤ 40V
TA = +25°C
-1.213 -1.250 -1.287
3V ≤ I VI - VO I ≤ 40V
10mA ≤ IO ≤ 1.5A
-1.200 -1.250 -1.300
Unit
%/ V
mV
V
0°C ≤ ΤJ ≤ +125°C
-
0.6
-
3V ≤I VI - VO I ≤ 40V
-
2.5
10
3V ≤I VI - VO I ≤ 10V
-
1.5
6
TA = +25°C 10Hz ≤ f ≤10kHz
-
0.003
-
VO = -10V, f = 120Hz
-
60
-
CADJ = 10μF (Note2)
66
77
-
-
0.3
1
%
-
4
-
°C/W
TJ = 125°C ,1000Hours
-
%
mA
%
dB
Note:
1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
2. CADJ, when used, is connected between the adjustment pin and ground.
2
LM337
Typical Application
IPROG
R2
Ci
0. 1μF
+
+
Iadj
R1
Co
1μF
Vadj
-VI
VI
KA337
LM337
Vo
-Vo
Figure 1. Programmable Regulator
• Ci is required if regulator is located more then 4 inches from power supply filter.
A 1.0μF solid tantalum or 10μF aluminum electrolytic is recommended.
Co is necessary for stability. A 1.0μF solid tantalum or 10μF aluminum electrolytic is recommended.
• VO= -1.25V (1+R2/R1)
3
LM337
Mechanical Dimensions
Package
Dimensions in millimeters
TO-220 [SINGLE GAUGE]
4
LM337
Ordering Information
Product Number
Package
Operating Temperature
LM337T
TO-220
0°C to +125°C
5
LM337
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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