STMICROELECTRONICS LM337K

LM137
LM337
Three-terminal adjustable negative voltage regulators
Features
■
Output voltage adjustable down to VREF
■
1.5 A guaranteed output current
■
0.3 %/V typical load regulation
■
0.01 %/V typical line regulation
■
Current limit constant with temperature
■
Ripple rejection: 77 dB
■
Standard 3-lead transistor packages
■
Excellent thermal regulation: 0.002 %/V
■
50 ppm/°C temperature coefficient
TO-220
Description
The LM137 series are adjustable 3-terminal
negative voltage regulators capable of supplying
in excess -1.5 A over a -1.2 to -37 V output
voltage range. They are exceptionally easy to use
and require only two external resistors to set the
output voltage. Further, both line and load
regulation are better than standard fixed
regulators. Also, LM137 regulators are supplied in
standard transistor packages which are easily
mounted and handled. In addition to higher
performance than fixed regulators, the LM137
series offer full overload protection available only
in integrated circuits.
Table 1.
July 2008
TO-3
Included on the chip are current limit, thermal
overload protection and safe area protection. All
overload protection circuitry remains fully
functional even if the adjustment terminal is
disconnected.
Device summary
Part numbers
Order codes
Temperature range
LM137
LM137K
-55 °C to 150 °C
LM337
LM337K
0 °C to 125 °C
Rev 3
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www.st.com
18
Contents
LM137 - LM337
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6
Thermal regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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LM137 - LM337
1
Diagram
Figure 1.
Schematic diagram
Diagram
3/18
Pin configuration
LM137 - LM337
2
Pin configuration
Figure 2.
Pin connections (top view)
TO-220
4/18
TO-3
LM137 - LM337
Maximum ratings
3
Maximum ratings
Table 2.
Absolute maximum ratings
Symbol
Value
Unit
Input output voltage differential
40
V
IO
Output current
1.5
A
PD
Power dissipation
VI - VO
Parameter
Internally limited
TSTG
Storage temperature range
TOP
Operating junction temperature range
- 65 to 150
LM137
- 55 to 150
LM337
0 to 125
°C
°C
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 3.
Thermal data
Symbol
Parameter
TO-220
TO-3
Unit
RthJC
Thermal resistance junction-case max.
3
4
°C/W
RthJA
Thermal resistance junction-ambient max.
70
35
°C/W
5/18
Electrical characteristics
LM137 - LM337
4
Electrical characteristics
Table 4.
Electrical characteristics of LM137 (TJ = -55 to 150 °C, VI - VO = 5 V, IO = 0.5 A unless
otherwise specified) (1)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
-1.225
-1.25
-1.275
-1.2
-1.25
-1.3
IO = 0.1 A
0.01
0.02
IO = 20 mA
0.01
0.02
|VO| ≤ 5 V
15
25
mV
|VO| ≥ 5 V
0.3
0.5
%
0.002
0.02
%/W
65
100
µA
2
5
µA
0.02
0.05
%/V
|VO| ≤ 5 V
20
50
mV
|VO| ≥ 5 V
0.3
1
%
|VI - VO| ≤ 40 V
2.5
5
|VI - VO| ≤ 10 V
1.2
3
Ta = 25°C
VREF
Reference voltage
KVI
Line regulation (2)
KVO
Load regulation (2)
Thermal regulation
|VI - VO| = 3 to 40 V, TJ = Tmin to Tmax
|IO| = 10mA to |IO(max)| P ≤ Pmax
Ta = 25°C
|VI - VO| = 3 to 40 V
Ta = 25°C
|IO| = 10mA to |IO(max)|
Adjustment pin current
ΔIADJ
Adjustment pin current
change
Ta = 25°C, |IO| = 10 mA to |IO(max)|
|VI - VO| = 3 to 40 V
KVI
Line regulation (2)
|VI - VO| = 3 to 40 V
KVO
Load regulation (2)
|IO| = 10mA to |IO(max)|
|IO(min)| Minimum load current
IOS
Short circuit output current
VNO
RMS output noise
(% of VO)
RVF
Ripple rejection ratio
KVT
Temperature stability
KVH
Long term stability
V
%/V
Ta = 25°C, pulse 10 ms
IADJ
mA
|VI - VO| ≤ 15 V
1.5
2.2
|VI - VO| = 40 V, TJ =25°C
0.24
0.4
A
Ta = 25°C, f = 10 Hz to 10 kHz
0.003
VO = -10 V, f = 120 Hz
CADJ = 10 µF
%
60
dB
66
77
0.6
Ta = 125°C, 1000 H
0.3
%
1
1. Although power dissipation is internally limited, these specifications are applicable for power dissipation of:
15 W for TO-220 and 20 W for TO-3 Package; IO(max) is 1.5 A
2. 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.
6/18
Unit
%
LM137 - LM337
Table 5.
Symbol
Electrical characteristics
Electrical characteristics of LM337 (TJ = 0 to 150 °C unless otherwise specified). (1)
Parameter
Test conditions
Min.
Typ.
Max.
-1.213
-1.25
-1.287
-1.2
-1.25
-1.3
IO = 0.1 A
0.01
0.04
IO = 20 mA
0.01
0.04
|VO| ≤ 5 V
15
50
mV
|VO| ≥ 5 V
0.3
1
%
0.003
0.04
%/W
65
100
µA
2
5
µA
0.02
0.07
%/V
|VO| ≤ 5 V
20
70
mV
|VO| ≥ 5 V
0.3
1.5
%
|VI - VO| ≤ 40 V
2.5
10
|VI - VO| ≤ 10 V
1.5
6
Ta = 25°C
VREF
Reference voltage
KVI
Line regulation (2)
KVO
Load regulation (2)
Thermal regulation
|VI - VO| = 3 to 40 V, TJ = Tmin to Tmax
|IO| = 10mA to |IO(max)|, P ≤ Pmax
Ta = 25°C
|VI - VO| = 3 to 40 V
Ta = 25°C
|IO| = 10mA to |IO(max)|
Adjustment pin current
ΔIADJ
Adjustment pin current
change
Ta = 25°C, |IO| = 10 mA to |IO(max)|
|VI - VO| = 3 to 40 V
KVI
Line regulation (2)
|VI - VO| = 3 to 40 V
KVO
Load regulation (2)
|IO| = 10mA to |IO(max)|
|IO(min)| Minimum load current
IOS
Short circuit output current
VNO
RMS output noise
(% of VO)
RVF
Ripple rejection ratio
KVT
Temperature stability
KVH
Long term stability
V
%/V
Ta = 25°C, pulse 10 ms
IADJ
mA
|VI - VO| ≤ 15 V
1.5
2.2
|VI - VO| = 40 V, TJ =2 5°C
0.15
0.4
A
Ta = 25°C, f = 10 Hz to 10 kHz
0.003
VO = -10 V, f = 120 Hz
CADJ = 10 µF
%
60
dB
66
77
0.6
Ta = 125°C, 1000 H
Unit
0.3
%
1
%
1. Although power dissipation is internally limited, these specifications are applicable for power dissipation of:
15 W for TO-220 and 20 W for TO-3 package; IO(max) is 1.5 A.
2. 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.
7/18
Typical characteristics
LM137 - LM337
5
Typical characteristics
Figure 3.
Load regulation
Figure 4.
Current limit
Figure 5.
Adjustment current
Figure 6.
Dropout voltage
Figure 7.
Temperature stability
Figure 8.
Minimum operating current
8/18
LM137 - LM337
Figure 9.
Ripple rejection vs output voltage
Typical characteristics
Figure 10. Ripple rejection vs frequency
Figure 11. Ripple rejection vs output current
Figure 12. Output impedance
Figure 13. Line transient response
Figure 14. Load transient response
9/18
Thermal regulation
6
LM137 - LM337
Thermal regulation
When power is dissipated in an IC, a temperature gradient occurs across the IC chip
affecting the individual IC circuit components. With an IC regulator, this gradient can be
especially severe since power dissipation is large.
Thermal regulation is the effect of these temperature gradients on output voltage (in
percentage output change) per watt of power change in a specified time. Thermal regulation
error is independent of electrical regulation or temperature coefficient, and occurs within 5
ms to 50 ms after a change in power dissipation. Thermal regulation depends on IC layout
as well as electrical design. The thermal regulation of a voltage regulator is defined as the
percentage change of VO, per watt, within the first 10ms after a step of power, is applied.
The LM137 specification is 0.02 %/W max. In Figure 1, a typical LM337’s output drifts only 3
mV for 0.03% of VO = – 10 V) when a 10 W pulse is applied for 10 ms. This performance is
thus well inside the specification limit of 0.02 %/W x 10 W = 0.2% max. When the 10 W
pulse is ended the thermal regulation again shows a 3 mV step as the LM137 chip cools off.
Note that the load regulation error of about 8 mV (0.08 %) is additional to the thermal
regulation error.
In Figure 2, when the 10 W pulse is applied for 100 ms, the output drifts only slightly beyond
the drift in the first 10 ms and the thermal error stays well within 0.1% (10 mV).
10/18
LM137 - LM337
7
Typical application
Typical application
Figure 15. Adjustable negative voltage regulator
* C1 = 1 µF solid tantalum or 10µF aluminium electrolytic required for stability.
** C2 = 1 µF solid tantalum is required only if regulator is more than 10 cm from power supply filter capacitors
Figure 16. Adjustable lab voltage regulator
* The 10 µF capacitors are optimal to improve ripple rejection.
11/18
Typical application
LM137 - LM337
Figure 17. Current regulator
Figure 18. Negative regulator with protection diodes
* When CL is larger than 20 µF, D1 protects the LM137 in case the input supply is shorted.
** When C2 is larger than 10 µF and VO is larger than - 25 V, D2 protects the LM137 in case the output is
shorted.
12/18
LM137 - LM337
Typical application
Figure 19. - 5.2 V regulator with electronic shutdown (1)
1. Minimum output = - 1.3 V when control input is low.
Figure 20. Current regulator
13/18
Package mechanical data
8
LM137 - LM337
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
14/18
LM137 - LM337
Package mechanical data
TO-220 mechanical data
Dim.
mm.
Min.
Typ.
inch.
Max.
Min.
Typ.
Max.
A
4.40
4.60
0.173
0.181
C
1.23
1.32
0.048
0.051
D
2.40
2.72
0.094
0.107
0.70
0.019
0.027
D1
E
1.27
0.49
0.050
F
0.61
0.88
0.024
0.034
F1
1.14
1.70
0.044
0.067
F2
1.14
1.70
0.044
0.067
G
4.95
5.15
0.194
0.203
G1
2.4
2.7
0.094
0.106
H2
10.0
10.40
0.393
0.409
L2
16.4
0.645
L4
13.0
14.0
0.511
0.551
L5
2.65
2.95
0.104
0.116
L6
15.25
15.75
0.600
0.620
L7
6.2
6.6
0.244
0.260
L9
3.5
3.93
0.137
0.154
DIA.
3.75
3.85
0.147
0.151
P011C
15/18
Package mechanical data
LM137 - LM337
TO-3 mechanical data
mm.
Dim.
Min.
A
inch.
Typ.
Max.
Min.
Typ.
11.85
B
0.96
Max.
0.466
1.05
1.10
0.037
0.041
0.043
C
1.70
0.066
D
8.7
0.342
E
20.0
0.787
G
10.9
0.429
N
16.9
0.665
P
26.2
R
3.88
1.031
4.09
U
0.152
39.5
V
1.555
30.10
1.185
A
P
D
C
O
N
B
V
E
G
U
0.161
R
P003C/C
16/18
LM137 - LM337
Revision history
9
Revision history
Table 6.
Document revision history
Date
Revision
Changes
19-Jul-2004
1
First issue.
10-Jan-2005
2
Modified pin connection for TO-3.
17-Jul-2008
3
Added: Table 1 on page 1.
17/18
LM137 - LM337
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