LM337SP [STMICROELECTRONICS]
NEGATIVE VOLTAGE REGULATORS THREE-TERMINAL ADJUSTABLE; 负稳压器三端可调
| 型号： | LM337SP |
| 厂家： | 
ST |
| 描述： | NEGATIVE VOLTAGE REGULATORS THREE-TERMINAL ADJUSTABLE |
| 文件： | 总14页 (文件大小：247K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LM137/LM237
LM337
THREE-TERMINAL ADJUSTABLE
NEGATIVE VOLTAGE REGULATORS
.
OUTPUT VOLTAGE ADJUSTABLE DOWN TO
Vref
.
.
.
.
1.5A GUARANTEED OUTPUT CURRENT
0.3%/V TYPICAL LOAD REGULATION
0.01%/V TYPICAL LINE REGULATION
CURRENT LIMIT CONSTANT WITH TEM-
PERATURE
RIPPLE REJECTION : 77dB
STANDARD 3-LEAD TRANSISTOR PACK-
AGES
.
.
TO-3
TO-220
TO-39
.
EXCELLENT
0.002%/V
THERMAL
REGULATION:
.
50ppm/°C TEMPERATURE COEFFICIENT
DESCRIPTION
The LM137 series are adjustable 3-terminal nega-
tive voltage regulators capable of supplying in ex-
cess- 1.5Aovera -1.2 to -37Voutput voltagerange.
They are exceptionally easy to use and require only
two external resistors to set the output voltage. Fur-
ther, 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. Included on the chip are
current limit, thermal overload protection and safe
area protection. All overload protection circuitry re-
mainsfullyfunctional even ifthe adjustment terminal
is disconnected.
PIN CONNECTIONS
TO-3
(bottom view)
TO-39
(bottom view)
TO-220
(front view)
1 - Adj
2 - Output
3 - Input
1 - Output
2 - Adj
Case is input
1 - Adj
2 - Output
3 - input
Heatsink surface connected to input
March 1993
1/14
LM137-LM237-LM337
ABSOLUTE MAXIMUM RATING
Symbol
Parameter
Value
40
Unit
V
VI - VO Input Output Voltage Differential
IO
Output Current
TO-220/TO-3
TO-39
1.5
A
0.5
Toper
LM137
-55 to 150
-25 to 150
0 to 125
-65 to 150
Internally Limited
oC
LM237
LM337
Tstg
Ptot
oC
W
THERMAL CHARACTERISTICS
Symbol
Parameter
Typ.
Max.
4
Unit
oC/W
Rthj-case Junction-case Thermal Resistance
TO-3
TO-220
TO-39
TO-3
3
15
35
70
160
Rthj-amb Junction-ambient Thermal Resistance
oC/W
TO-220
TO-39
ORDER CODES
PART NUMBER
TEMPERATURE
RANGE
PACKAGE
TO-3
TO-220
TO-39
LM137
LM237
LM337
-55 to 150 oC
-25 to 150 oC
0 to 125 oC
LM137K
LM237K
LM337K
LM137H
LM237H
LM337H
LM237SP
LM337SP
2/14
LM137-LM237-LM337
SCHEMATIC DIAGRAM
3/14
LM137-LM237-LM337
ELECTRICAL CHARACTERISICS
LM137: -55 oC < Tj < 150 oC
LM237: -25 oC < Tj < 150 oC
o
LM337: 0 C < Tj < 150 oC
VI - VO = 5V, IO = 0.5 A (unless otherwise specified)
Symbol
Parameter
LM137/LM237
Min. Typ. Max.
LM337
Typ.
Unit
Min.
Max.
Vref
Reference Voltage
Tamb = 25 oC
-1.225 -1.25 -1.275 -1.213 -1.25 -1.287
V
T
min ≤ Tj ≤ Tmax
3V ≤ |VI - VO| ≤ 40V, 10mA ≤ |IO| ≤ |IO(max)
|
P ≤ Pmax
-1.2
-1.25
-1.3
-1.2
-1.25
-1.3
KVI
Line Regulation
(Tamb = 25 oC, 3V ≤ |VI -VO| ≤ 40V) - Note 2
IO = 0.1 A
IO = 20 mA
0.01
0.01
0.02
0.02
0.01
0.01
0.04
0.04
%/V
%/V
KVO
Load Regulation
(Tamb = 25 oC, 10mA ≤ |IO| ≤ |IO(max)|) - Note 2
|VO| ≤ 5V
|VO| ≥ 5V
15
0.3
25
0.5
15
0.3
50
1
mV
%
Thermal Regulation (Tamb = 25 oC, pulse 10 ms)
0.002 0.02
0.003 0.04
%/W
µA
Iadj
Adjustment Pin Current
65
2
100
5
65
2
100
5
∆Iadj
Adjustment Pin Current Change
(Tamb = 25 oC, 10mA ≤ |IO| ≤ |IO(max)|,
3V ≤ |VI -VO| ≤ 40V)
µA
KVI
Line Regulation (3V ≤ |VI -VO| ≤ 40V) - Note 2
0.02
0.05
0.02
0.07
%/V
KVO
Load Regulation
(10mA ≤ |IO| ≤ |IO(max)|) - Note 2
|VO| ≤ 5V
20
0.3
50
1
20
0.3
70
1.5
mV
%
|VO| ≥ 5V
|IO(min)
|
Minimum Load Current
|VI -VO| ≤ 40V
2.5
1.2
5
3
2.5
1.5
10
6
mA
mA
|VI -VO| ≤ 10V
IOS
Short Circuit Output Current
|VI -VO| ≤ 15V (TO-3 and TO-220)
1.5
0.5
0.24
0.15
2.2
1.5
0.5
0.15
0.1
2.2
A
A
A
A
|VI -VO| ≤ 15V (TO-39)
o
|VI -VO| = 40V, T = 25 C (TO-3 and TO-220)
0.4
0.2
0.4
0.2
j
o
|VI -VO| = 40V, T = 25 C (TO-39)
j
VNO
Rvf
RMS Output Noise (% of VO)
0.003
0.003
%
Tamb = 25 oC, 10Hz ≤ f ≤ 10KHz
Ripple Rejection Ratio
VO = - 10 V, f = 120 Hz
Cadj = 10 µF
60
77
60
77
dB
dB
66
66
KVT
KVH
Temperature Stability
Long Term Stability (Tamb = 125 oC, 1000H)
0.6
0.3
0.6
0.3
%
%
1
1
Notes : 1. Although power dissipation is internally limited, these specifications are applicable for power dissipation of :
•
•
•
2W for TO-39
15W for TO-220
20W for TO-3 Package
IO(max) is :
•
•
1.5A for TO-3 and TO-220
0.5A for TO-39
2. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in out-
put voltage due to heating effects are covered under the specification for thermal regulation.
4/14
LM137-LM237-LM337
5/14
LM137-LM237-LM337
6/14
LM137-LM237-LM337
THERMAL REGULATION
When power is dissipated in an IC, a temperature
gradient occurs across the IC chip affecting the in-
dividual IC circuit components. With anIC regulator,
this gradient can be especially severe since power
dissipation is large.
The LM137 specification is 0.02 %/W max.In figure
1, atypicalLM337’s output drifts only 3mV for0.03%
of VO = – 10V) when a 10W pulse is applied for
10ms. This performance is thus well inside the spe-
cificationlimit of 0.02%/W x10W =0.2% max. When
the 10W pulse isended the thermal regulation again
shows a 3mV step as the LM137 chip cools off.
Note that the load regulation error of about
8mV(0.08%) is additional to the thermal regulation
error.
Thermal regulation is the effect of these tempera-
ture gradients on output voltage (in percentage out-
put change) per watt of power change in a specified
time. Thermal regulation error is independent of
electrical regulation or temperature coefficient, and
occurs within 5ms to 50ms after a change in power
dissipation. Thermal regulation depends on IC
layoutaswell as electrical design. The thermalregu-
lation of a voltage regulator is defined as the per-
centage change of VO, perwatt, withinthe first 10ms
after a step of power, is applied.
In figure 2, when the 10W pulse is applied for
100ms, the output drifts onlyslightly beyond the drift
in the first 10ms and the thermal error stays well
within 0.1% (10mV).
Figure 1.
Figure 2.
LM 337, V0 = – 10V
VI – V0 = – 40V
LM 337, V0 = – 10V
VI – V0 = – 40V
IL = 0A → 0.25A → 0A
Vertical sensitivity 5mV/div.
IL = 0A → 0.25A → 0A
Horizontal sensitivity 20msN/div.
7/14
LM137-LM237-LM337
TYPICAL APPLICATIONS
ADJUSTABLE NEGATIVE VOLTAGE REGULATOR
*
*
C1 = 1µF solid tantalum or 10µF aluminium electrolytic required for stability.
C2 = 1µF solid tantalum is required only if regulator is more than 10cm from power supply filter capacitor.
*
ADJUSTABLE LAB VOLTAGE REGULATOR
*
The 10µF capacitors are optimal to improve ripplerejection.
8/14
LM137-LM237-LM337
CURRENT REGULATOR
NEGATIVE REGULATOR WITH PROTECTION DIODES
*
*
When CL is larger than 20µF, D1 protects the LM137 in case the input supply is shorted.
When C2 is larger than 10µF and V0 is larger than – 25V, D2 protects the LM137 in casethe output is shorted.
*
9/14
LM137-LM237-LM337
* – 5.2V REGULATOR WITH ELECTRONIC SHUTDOWN
*
Minimum output ≡ – 1.3V when control input is low.
ADJUSTABLE CURRENT REGULATOR
10/14
LM137-LM237-LM337
TO-3 MECHANICAL DATA
mm
inch
DIM.
MIN.
11.00
0.97
TYP.
MAX.
13.10
1.15
MIN.
0.433
0.038
0.059
0.327
0.748
0.421
0.649
0.984
0.157
1.515
1.187
TYP.
MAX.
0.516
0.045
0.065
0.351
0.787
0.437
0.677
1.023
0.161
1.547
1.193
A
B
C
D
E
G
N
P
R
U
V
1.50
1.65
8.32
8.92
19.00
10.70
16.50
25.00
4.00
20.00
11.10
17.20
26.00
4.09
38.50
30.00
39.30
30.30
A
D
P
C
G
R
P003F
11/14
LM137-LM237-LM337
TO-220 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
4.60
1.32
2.72
MIN.
0.173
0.048
0.094
MAX.
0.181
0.051
0.107
A
C
4.40
1.23
2.40
D
D1
E
1.27
0.050
0.49
0.61
1.14
1.14
4.95
2.4
0.70
0.88
1.70
1.70
5.15
2.7
0.019
0.024
0.044
0.044
0.194
0.094
0.393
0.027
0.034
0.067
0.067
0.203
0.106
0.409
F
F1
F2
G
G1
H2
L2
L4
L5
L6
L7
L9
DIA.
10.0
10.40
16.4
0.645
13.0
2.65
15.2
6.2
14.0
2.95
15.9
6.6
0.511
0.104
0.598
0.244
0.137
0.147
0.551
0.116
0.625
0.260
0.165
0.151
3.5
4.2
3.75
3.85
L2
Dia.
L5
L9
L7
L6
L4
P011C
12/14
LM137-LM237-LM337
TO39 MECHANICAL DATA
mm
inch
DIM.
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
B
D
E
F
G
H
I
12.7
0.500
0.49
6.6
8.5
9.4
0.019
0.260
0.334
0.370
5.08
0.200
1.2
0.9
0.047
0.035
L
45o (typ.)
D
A
G
I
H
L
P008B
13/14
LM137-LM237-LM337
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specificationsmentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronicsproductsare notauthorized foruse ascritical componentsin life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.
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14/14
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