Motorola LM337MT Datasheet
The LM337M is an adjustable three–terminal negative voltage regulator
capable of supplying in excess of 500 mA over an output voltage range of
–1.2 V to –37 V. This voltage regulator is exceptionally easy to use and
requires only two external resistors to set the output voltage. Further, it
employs internal current limiting, thermal shutdown and safe area
compensation, making it essentially blow–out proof.
The LM337M serves a wide variety of applications including local,
on–card regulation. This device can also be used to make a programmable
output regulator or by connecting a fixed resistor between the adjustment
and output. The LM337M can be used as a precision current regulator.
• Output Current in Excess of 500 mA
• Output Adjustable Between –1.2 V and –37 V
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
• Output Transistor Safe–Area Compensation
• Floating Operation for High Voltage Applications
• Standard 3–Lead Transistor Packages
• Eliminates Stocking Many Fixed Voltages
Order this document by LM337M/D
MEDIUM CURRENT
THREE–TERMINAL
ADJUSTABLE NEGATIVE
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Pin 1. Adjust
2. V
3. V
in
out
1
2
3
Standard Application
I
PROG
I
Adj
LM337M
V
out
R2
Adjust
+
R1
120
V
out
µ
F solid tantalum or 10 µF aluminum
–1.25 Vǒ1
)
Cin *+1.0
–V
in
*Cin is required if regulator is located more than 4
**A 1.0
**CO is necessary for stability. A 1.0
**electrolytic is recommeded.
MOTOROLA ANALOG IC DEVICE DATA
µ
F
V
in
µ
F solid tantalum or 10 µF aluminum electrolytic is recommended.
+
CO **
R2
R1
1.0µF
″
from power supply filter.
Ǔ
–V
out
ORDERING INFORMATION
Device Package
LM337MT Plastic Power
Motorola, Inc. 1996 Rev 1
Operating
Temperature Range
TJ = 0° to +125°C
1
MAXIMUM RATINGS
Rating Symbol Value Unit
Input–Output V oltage Differential VI–V
Power Dissipation P
Operating Junction Temperature Range T
Storage Temperature Range T
O
D
J
stg
LM337M
40 Vdc
Internally Limited W
0 to +125 °C
–65 to +150 °C
ELECTRICAL CHARACTERISTICS (|V
Characteristics
Line Regulation (Note 3)
TA = 25°C, 3.0 V ≤ |VI–VO| ≤ 40 V
Load Regulation (Note 3)
TA = 25°C, 10 mA ≤ IO ≤ 0.5 A
|VO| ≤ 5.0V
|VO| ≥ 5.0V
Thermal Regulation
10 ms Pulse, TA = 25°C
Adjustment Pin Current 3 I
Adjustment Pin Current Change
2.5 V ≤ |VI–VO| ≤ 40 V, 10 mA ≤ IL ≤ 0.5 A,
PD ≤ P
Reference Voltage
3.0 V ≤ |VI–VO| ≤ 40 V, 10 mA ≤ IO ≤ 0.5 A,
PD ≤ P
T
Line Regulation (Note 3)
3.0 V ≤ |VI–VO| ≤ 40 V
Load Regulation (Note 3)
10 mA ≤ IO ≤ 0.5 A
|VO| ≤ 5.0 V
|VO| ≥ 5.0 V
Temperature Stability (T
Minimum Load Current to Maintain Regulation
(|VI–VO| ≤ 10 V)
(|VI–VO| ≤ 40 V)
Maximum Output Current
|VI–VO| ≤ 15 V, PD ≤ P
|VI–VO| ≤ 40 V, PD ≤ P
RMS Noise, % of V
TA = 25°C, 10 Hz ≤ f ≤ 10 kHz
Ripple Rejection, VO = –10 V, f = 120 Hz (Note 4)
Without C
C
Adj
Long Term Stability, TJ = T
TA = 25°C for Endpoint Measurements
Thermal Resistance, Junction–to–Case – R
NOTES: 1.T
, TA = 25°C
max
, TA = 25°C
max
to T
low
high
≤ TJ ≤ T
low
max
, TJ = 25°C
max
O
Adj
= 10 µF
(Note 5)
high
to T
low
2.P
max
3 Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately.
Pulse testing with low duty cycle is used.
4.C
Adj
5.Since Long T erm Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability
from lot to lot.
= 0° to +125°C
high
= 7.5 W
, when used, is connected between the adjustment pin and ground.
– VO| = 5.0 V , IO = 0.1; TJ = T
I
low
to T
Figure Symbol Min Typ Max Unit
1 Reg
2 Reg
– Reg
1, 2 ∆I
3 V
1 Reg
2 Reg
) 3 T
high
3 I
3 I
– N – 0.003 – %/V
4 RR
3 S – 0.3 1.0 %/1.0 k
[Note 1], P
high
line
load
therm
Adj
Adj
ref
line
load
S
Lmin
max
ΘJC
per Note 2, unless otherwise noted.)
max
– 0.01 0.04 %/V
–
–
15
0.3
15
1.0
– 0.03 0.04 % VO/W
– 65 100 µA
– 2.0 5.0 µA
–1.213
–1.20
–1.250
–1.25
–1.287
–1.30
– 0.02 0.07 %/V
–
–
20
0.3
70
1.5
– 0.6 – %/V
–
–
0.5
0.1
–
66
1.5
2.5
0.9
0.25
60
77
6.0
10
– 7.0 – °C/W
mV
%/V
O
V
mV
%/V
O
O
mA
A
–
–
O
dB
–
–
Hrs
2
MOTOROLA ANALOG IC DEVICE DATA
LM337M
Schematic Diagram
750 60k 100k
4.0k
1.0k
9.6k
270
8.0k
2.9k
600
4.0k
18k
20k
100
2.5k
500
800
6.0k
100k
2.4k
50k
100pF
810
15pF
3.0k
10k
2.2k
15
2.0k
21k
2.0k
5.0pF
15pF
5.0k
500
800
25pF
18k
240
220
155
100
30k
2.0
pF
60
250
15
Adjust
V
0.2
0.1
V
out
in
Figure 1. Line Regulation and ∆I
C
1.0µF
in
* Pulse Testing Required:
1% Duty Cycle is suggested.
*
V
EE
MOTOROLA ANALOG IC DEVICE DATA
/Line Test Circuit
Adj
R2 1%
+
C
1.0
µ
I
Adj
Adjust
V
in
LM337M
V
IH
V
IL
R1
V
out
Line Regulation (%/VO) =
O
120
1%
F
R
|VOL – VOH|
|VOH|
L
V
OH
V
OL
x 100
3
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