LM337MT [MOTOROLA]
MEDIUM CURRENT THREE.TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATOR; 中等电流THREE.TERMINAL可调负电压稳压
| 型号： | LM337MT |
| 厂家： | 
MOTOROLA |
| 描述： | MEDIUM CURRENT THREE.TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATOR |
| 文件： | 总8页 (文件大小：162K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Order this document by LM337M/D
MEDIUM CURRENT
THREE–TERMINAL
ADJUSTABLE NEGATIVE
VOLTAGE REGULATOR
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.
SEMICONDUCTOR
TECHNICAL DATA
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.
T SUFFIX
PLASTIC PACKAGE
CASE 221A
• 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
Pin 1. Adjust
2. V
1
in
2
3. V
out
3
Standard Application
I
PROG
R2
+
+
C
*
1.0µF
C
**
1.0µF
in
O
R1
120
I
Adj
Adjust
V
V
out
in
LM337M
–V
in
–V
out
*C is required if regulator is located more than 4
″
from power supply filter.
in
ORDERING INFORMATION
Operating
**A 1.0
µF solid tantalum or 10 µF aluminum electrolytic is recommended.
**C is necessary for stability. A 1.0
µF solid tantalum or 10
µF aluminum
O
**electrolytic is recommeded.
Device
Package
Temperature Range
R2
R1
V
–1.25 V 1
LM337MT
T = 0° to +125°C
J
Plastic Power
out
Motorola, Inc. 1996
Rev 1
LM337M
MAXIMUM RATINGS
Rating
Symbol
V –V
Value
Unit
Vdc
W
Input–Output Voltage Differential
Power Dissipation
40
I
O
P
D
Internally Limited
0 to +125
Operating Junction Temperature Range
Storage Temperature Range
T
J
°C
T
stg
–65 to +150
°C
ELECTRICAL CHARACTERISTICS (|V – V | = 5.0 V, I = 0.1; T = T
to T
[Note 1], P
per Note 2, unless otherwise noted.)
I
O
O
J
low
high
max
Characteristics
Figure
Symbol
Min
Typ
Max
Unit
Line Regulation (Note 3)
= 25°C, 3.0 V ≤ |V –V | ≤ 40 V
1
Reg
–
0.01
0.04
%/V
line
T
A
I
O
Load Regulation (Note 3)
= 25°C, 10 mA ≤ I ≤ 0.5 A
2
–
Reg
load
T
A
O
|V | ≤ 5.0V
–
–
15
0.3
15
1.0
mV
O
|V | ≥ 5.0V
%/V
O
O
Thermal Regulation
Reg
–
0.03
0.04
% V /W
O
therm
10 ms Pulse, T = 25°C
A
Adjustment Pin Current
3
I
–
–
65
100
5.0
µA
µA
Adj
Adjustment Pin Current Change
1, 2
∆I
Adj
2.0
2.5 V ≤ |V –V | ≤ 40 V, 10 mA ≤ I ≤ 0.5 A,
I
O
A
L
P
D
≤ P
, T = 25°C
max
Reference Voltage
3
V
ref
V
3.0 V ≤ |V –V | ≤ 40 V, 10 mA ≤ I ≤ 0.5 A,
I
O
A
high
O
P
D
T
≤ P
, T = 25°C
–1.213 –1.250 –1.287
max
to T
–1.20
–1.25
–1.30
low
Line Regulation (Note 3)
3.0 V ≤ |V –V | ≤ 40 V
1
2
Reg
–
0.02
0.07
%/V
mV
line
I
O
Load Regulation (Note 3)
10 mA ≤ I ≤ 0.5 A
Reg
load
O
|V | ≤ 5.0 V
–
–
20
0.3
70
1.5
%/V
O
O
|V | ≥ 5.0 V
O
Temperature Stability (T
≤ T ≤ T
)
3
3
T
–
0.6
–
%/V
low
J
high
S
O
Minimum Load Current to Maintain Regulation
(|V –V | ≤ 10 V)
I
mA
A
Lmin
–
–
1.5
2.5
6.0
10
I
O
(|V –V | ≤ 40 V)
I
O
Maximum Output Current
|V –V | ≤ 15 V, P ≤ P
3
I
max
0.5
0.1
0.9
0.25
–
–
I
I
O
O
D
D
max
max
|V –V | ≤ 40 V, P ≤ P
, T = 25°C
J
RMS Noise, % of V
–
4
N
–
0.003
–
%/V
O
O
T
A
= 25°C, 10 Hz ≤ f ≤ 10 kHz
Ripple Rejection, V = –10 V, f = 120 Hz (Note 4)
RR
dB
O
Without C
–
66
60
77
–
–
Adj
C
= 10 µF
Adj
Long Term Stability, T = T
(Note 5)
3
–
S
–
–
0.3
1.0
%/1.0 k
Hrs
J
high
T
A
= 25°C for Endpoint Measurements
Thermal Resistance, Junction–to–Case
R
7.0
–
°C/W
ΘJC
NOTES: 1. T
to T
= 0° to +125°C
= 7.5 W
low
high
2. P
max
3 Load and line regulation are specified at constant junction temperature. Changes in V due to heating effects must be taken into account separately.
O
Pulse testing with low duty cycle is used.
4. C , when used, is connected between the adjustment pin and ground.
Adj
5. Since Long Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability
from lot to lot.
2
MOTOROLA ANALOG IC DEVICE DATA
LM337M
Schematic Diagram
Adjust
60
100
2.0k
2.5k
810
21k
V
out
10k
220
50k
2.0k
750
60k
100k
15pF
18k
4.0k
6.0k
100
1.0k
2.2k
18k
240
30k
2.0
pF
5.0pF
100pF
5.0k
0.2
100k
15
155
600
2.4k
500
15
500
0.1
V
in
Figure 1. Line Regulation and ∆I
Adj
/Line Test Circuit
R2
1%
+
C
1.0µF
C
1.0µF
I
O
in
Adj
120
1%
R1
R
L
Adjust
* Pulse Testing Required:
1% Duty Cycle is suggested.
V
V
in
out
LM337M
V
OH
V
V
IH
V
OL
IL
*
|V –V
|
OL OH
Line Regulation (%/V ) =
x 100
O
|V
|
OH
V
EE
3
MOTOROLA ANALOG IC DEVICE DATA
LM337M
Figure 2. Load Regulation and ∆I
/Load Test Circuit
Adj
* Pulse Testing required:
1% Duty Cycle is suggested.
R2
1%
C
+
O
C
1.0µF
in
1.0µF
120
1%
I
Adj
R1
*
Adjust
R
L
(max
Load)
–V (min Load)
O
V
V
out
in
LM33M
–V
in
I
V
(max Load)
L
O
V
(min Load) – V (max Load)
O
O
Load Regulation (mV) = V (min Load) – V (max Load)
Load Regulation (%/V ) =
x 100
O
O
O
V
(min Load)
O
Figure 3. Standard Test Circuit
1%
R2
+
C
O
C
1.0µF
1.0µF
in
V
V
O
I
R
L
V
I
ref
Adj
R1
120
Adjust
V
V
in
out
I
LM337M
L
To Calculate R2:
V
O
R2 =
R
1
– 1
Adj
V
ref
Pulse Testing Required: 1% Duty Cycle is suggested.
This assumes I
is negligible.
Figure 4. Ripple Rejection Test Circuit
+
C
10µF
Adj
R2
1%
+
V
C
in
O
C
1.0µF
1.0µF
O
R
L
Adjust
D1 *
1N4002
120
R1
V
V
out
in
LM337M
V
= –1.25 V
out
14.3V
4.3V
*D Discharges C
Adj
if Output is shorted to Ground.
1
f = 120 Hz
4
MOTOROLA ANALOG IC DEVICE DATA
LM337M
Figure 5. Load Regulation
Figure 6. Current Limit
4
0.2
0
I
= 0.5 A
L
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
–1.4
3
2
1
0
T
= 25°C
J
T
= 150°C
J
T
= 55°C
J
V
= –15 V
= –10 V
in
V
out
–50 –25
0
25
50
75
100 125
C)
150
0
10
20
30
40
T , JUNCTION TEMPERATURE (
°
V – V , INPUT VOLTAGE DIFFERENTIAL (Vdc)
J
I
O
Figure 7. Adjustment Pin Current
Figure 8. Dropout Voltage
3.0
2.5
2.0
1.5
1.0
80
75
70
65
60
V
∆
= –5.0 V
out
V
= 100 mV
out
55
50
I
= 500 mA
L
I
= 200 mA
L
45
40
I
= 20 mA
L
–50 –25
0
25
50
75
100 125
C)
150
–50 –25
0
25
50
75
100 125
C)
150
T , JUNCTION TEMPERATURE (
°
T , JUNCTION TEMPERATURE (
°
J
J
Figure 9. Temperature Stability
Figure 10. Minimum Operating Current
1.270
1.8
1.6
1.4
1.2
1.0
T
= –55°C
J
1.260
1.250
1.240
T
= 25°C
J
T
= 150°C
J
0.8
0.6
0.4
0.2
0
1.230
0
10
V –V , INPUT–OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
in out
20
30
40
–50 –25
0
25
50
75
100 125
C)
150
T , JUNCTION TEMPERATURE (
°
J
5
MOTOROLA ANALOG IC DEVICE DATA
LM337M
Figure 11. Ripple Rejection versus Output Voltage
Figure 12. Ripple Rejection versus Output Current
100
100
80
60
40
20
0
C
= 10
µ
F
Adj
C
= 10
Adj
µF
Adj
80
Without C
60
40
Without C
Adj
V
– V
= 5.0 V
= 500 mA
in
out
V
V
= –15 V
= –10 V
in
I
L
out
f = 120 Hz
= 25
20
0
f = 120 Hz
= 25
T
°C
J
T
°C
J
0
–5
–10
–15
–20
–25
–30
–35
–40
0.01
0.1
I , OUTPUT CURRENT (A)
O
1.0
10
V
, OUTPUT VOLTAGE (V)
O
Figure 13. Ripple Rejection versus Frequency
Figure 14. Output Impedance
1
0
100
80
60
40
20
0
10
V
= –15 V
= –10 V
= 500 mA
1.0 µF
in
V
out
I
C
L
10
C
= 10 µF
L =
J
Adj
T
= 25
°C
–1
–2
–3
10
10
10
Without C
Adj
Without C
Adj
C
= 10
µF
V
= –15 V
= –10 V
= 500 mA
= 25°C
Adj
in
V
out
I
L
T
J
10
100
1.0 k
10 k
100 k
1 M
10
100
1.0 k
10 k
100 k 1.0 M
10 M
f, FREQUENCY (Hz)
f, FREQUENCY (Hz)
Figure 15. Line Transient Response
Figure 16. Load Transient Reponse
0.6
0.4
0.2
0.8
Without C
Adj
0.6
0.4
0.2
0
Without C
Adj
C
= 10 µF
–0.2
Adj
0
–0.2
–0.4
–0.4
–0.6
C
= 10 µF
Adj
V
= –15 V
= –10 V
in
0
V
= –10 V
= 50 mA
= 25°C
= 1.0 µF
out
V
out
= 50 mA
I
T
L
J
I
T
0
–0.5
–1.0
–0.5
NL
= 25°C
= 1.0 µF
J
C
–1.0
–1.5
L
C
L
0
10
20
t, TIME (
30
40
0
10
20
t, TIME (µs)
30
40
µs)
6
MOTOROLA ANALOG IC DEVICE DATA
LM337M
APPLICATIONS INFORMATION
Basic Circuit Operation
The LM337M is a three–terminal floating regulator. In
operation, the LM337M develops and maintains a nominal
degrading regulation. The ground end of R can be returned
near the load ground to provide remote ground sensing and
improve load regulation.
2
–1.25 V reference (V ) between its output and adjustment
terminals. This reference voltage is converted to a
ref
External Capacitors
A
1.0 µF tantalum input bypass capacitor (C ) is
in
programming current (I
constant current flows through R to ground. The regulated
2
output voltage is given by:
) by R (see Figure 17), and this
PROG
1
recommended to reduce the sensitivity to input line
impedance.
The adjustment terminal may be bypassed to ground to
improve ripple rejection. This capacitor (C ) prevents ripple
Adj
R
R
2
1
from being amplified as the output voltage is increased. A
10 µF capacitor should improve ripple rejection about 15 dB
at 120 Hz in a 10 V application.
V
out
= V (1 +
ref
) + I
R
Adj 2
Since the current into the adjustment terminal (I
represents an error term in the equation, the LM337M was
designed to control I to less than 100 µA and keep it
)
Adj
An output capacitance (C ) in the form of a 1.0 µF
O
tantalum or 10 µF aluminum electrolytic capacitor is required
Adj
constant. To do this, all quiescent operating current is
returned to the output terminal. This imposes the requirement
for a minimum load current. If the load current is less than this
minimum, the output voltage will rise.
Since the LM337M is a floating regulator, it is only the
voltage differential across the circuit which is important to
performance, and operation at high voltages with respect to
ground is possible.
for stability.
Protection Diodes
When external capacitors are used with any IC regulator it
is sometimes necessary to add protection diodes to prevent
the capacitors from discharging through low current points
into the regulator.
Figure 18 shows the LM337M with the recommended
protection diodes for output voltages in excess of –25 V or
highcapacitance values (C > 25 µF, C
> 10 µF). DiodeD
O
Adj
1
prevents C from discharging thru the IC during an input
O
Figure 17. Basic Circuit Configuration
short circuit. Diode D protects against capacitor C
2
Adj
discharging through the IC during an output short circuit. The
combination of diodes D and D prevents C from
+
1
2
Adj
R
2
discharging through the IC during an input short circuit.
I
PRONG
I
Adj
+
C
V
out
O
R
Adjust
1
V
Figure 18. Voltage Regulator with
Protection Diodes
ref
V
–
in
LM337M
V
out
+
+
R
2
C
Adj
V
= –1.25 V Typically
ref
+
+
V
out
C
C
O
in
Load Regulation
Adjust
LM337M
R
D
2
1
The LM337M is capable of providing extremely good load
regulation, but a few precautions are needed to obtain
maximum performance. For best performance, the
–V
in
–
V
V
out
1N4002
in
programming resistor (R ) should be connected as close to
1
D
the regulator as possible to minimize line drops which
effectively appear in series with the reference, thereby
1
1N4002
7
MOTOROLA ANALOG IC DEVICE DATA
LM337M
OUTLINE DIMENSIONS
T SUFFIX
PLASTIC PACKAGE
CASE 221A–06
ISSUE Y
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION Z DEFINES A ZONE WHERE ALL
BODY AND LEAD IRREGULARITIES ARE
ALLOWED.
SEATING
PLANE
–T–
C
S
B
F
T
INCHES
MIN
MILLIMETERS
4
DIM
A
B
C
D
F
G
H
J
K
L
N
Q
R
S
MAX
0.620
0.405
0.190
0.035
0.147
0.105
0.155
0.025
0.562
0.060
0.210
0.120
0.110
0.055
0.255
0.050
–––
MIN
14.48
9.66
4.07
0.64
3.61
2.42
2.80
0.46
12.70
1.15
4.83
2.54
2.04
1.15
5.97
0.00
1.15
–––
MAX
15.75
10.28
4.82
0.88
3.73
2.66
3.93
0.64
14.27
1.52
5.33
3.04
2.79
1.39
6.47
1.27
–––
0.570
0.380
0.160
0.025
0.142
0.095
0.110
0.018
0.500
0.045
0.190
0.100
0.080
0.045
0.235
0.000
0.045
–––
A
K
Q
Z
1
2
3
U
H
L
R
J
V
T
U
V
G
D
Z
0.080
2.04
N
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the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specificallydisclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
datasheetsand/orspecificationscananddovaryindifferentapplicationsandactualperformancemayvaryovertime. Alloperatingparameters,including“Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
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ordeathmayoccur. ShouldBuyerpurchaseoruseMotorolaproductsforanysuchunintendedorunauthorizedapplication,BuyershallindemnifyandholdMotorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arisingoutof,directlyorindirectly,anyclaimofpersonalinjuryordeathassociatedwithsuchunintendedorunauthorizeduse,evenifsuchclaimallegesthatMotorola
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re registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
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LM337M/D
◊
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