ONSEMI LM337MT

Order this document by LM337M/D
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
•
•
•
•
•
•
•
MEDIUM CURRENT
THREE–TERMINAL
ADJUSTABLE NEGATIVE
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Output Adjustable Between –1.2 V and –37 V
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Pin 1. Adjust
2. Vin
3. Vout
Output Transistor Safe–Area Compensation
Floating Operation for High Voltage Applications
1
2
3
Standard 3–Lead Transistor Packages
Eliminates Stocking Many Fixed Voltages
Standard Application
IPROG
R2
+
Cin *
1.0µF
+
CO **
R1
120
1.0µF
IAdj
Adjust
Vin
–Vin
LM337M
Vout
–Vout
*Cin is required if regulator is located more than 4″ from power supply filter.
**A 1.0 µF solid tantalum or 10 µF aluminum electrolytic is recommended.
**CO is necessary for stability. A 1.0 µF solid tantalum or 10 µF aluminum
**electrolytic is recommeded.
Vout
ǒ Ǔ
+ –1.25 V 1 ) R2
R1
ORDERING INFORMATION
Device
LM337MT
Operating
Temperature Range
Package
TJ = 0° to +125°C
Plastic Power
 Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
Rev 1
1
LM337M
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
VI–VO
40
Vdc
Power Dissipation
PD
Internally Limited
W
Operating Junction Temperature Range
TJ
0 to +125
°C
Tstg
–65 to +150
°C
Input–Output Voltage Differential
Storage Temperature Range
ELECTRICAL CHARACTERISTICS (|VI – VO| = 5.0 V, IO = 0.1; TJ = Tlow to Thigh [Note 1], Pmax per Note 2, unless otherwise noted.)
Figure
Symbol
Min
Typ
Max
Unit
Line Regulation (Note 3)
TA = 25°C, 3.0 V ≤ |VI–VO| ≤ 40 V
1
Regline
–
0.01
0.04
%/V
Load Regulation (Note 3)
TA = 25°C, 10 mA ≤ IO ≤ 0.5 A
|VO| ≤ 5.0V
|VO| ≥ 5.0V
2
Regload
–
–
15
0.3
15
1.0
mV
%/VO
Thermal Regulation
10 ms Pulse, TA = 25°C
–
Regtherm
–
0.03
0.04
% VO/W
Adjustment Pin Current
3
IAdj
–
65
100
µA
Adjustment Pin Current Change
2.5 V ≤ |VI–VO| ≤ 40 V, 10 mA ≤ IL ≤ 0.5 A,
PD ≤ Pmax, TA = 25°C
1, 2
∆IAdj
–
2.0
5.0
µA
Reference Voltage
3.0 V ≤ |VI–VO| ≤ 40 V, 10 mA ≤ IO ≤ 0.5 A,
PD ≤ Pmax, TA = 25°C
Tlow to Thigh
3
Vref
Line Regulation (Note 3)
3.0 V ≤ |VI–VO| ≤ 40 V
1
Regline
Load Regulation (Note 3)
10 mA ≤ IO ≤ 0.5 A
|VO| ≤ 5.0 V
|VO| ≥ 5.0 V
2
Regload
Temperature Stability (Tlow ≤ TJ ≤ Thigh)
3
TS
Minimum Load Current to Maintain Regulation
(|VI–VO| ≤ 10 V)
(|VI–VO| ≤ 40 V)
3
ILmin
Maximum Output Current
|VI–VO| ≤ 15 V, PD ≤ Pmax
|VI–VO| ≤ 40 V, PD ≤ Pmax, TJ = 25°C
3
RMS Noise, % of VO
TA = 25°C, 10 Hz ≤ f ≤ 10 kHz
–
N
Ripple Rejection, VO = –10 V, f = 120 Hz (Note 4)
Without CAdj
CAdj = 10 µF
4
RR
Long Term Stability, TJ = Thigh (Note 5)
TA = 25°C for Endpoint Measurements
3
Thermal Resistance, Junction–to–Case
–
Characteristics
V
–1.213
–1.20
–1.250
–1.25
–1.287
–1.30
–
0.02
0.07
–
–
20
0.3
70
1.5
–
0.6
–
–
–
1.5
2.5
6.0
10
0.5
0.1
0.9
0.25
–
–
–
0.003
–
–
66
60
77
–
–
S
–
0.3
1.0
%/1.0 k
Hrs
RΘJC
–
7.0
–
°C/W
%/V
mV
%/VO
%/VO
mA
Imax
A
%/VO
dB
NOTES: 1. Tlow to Thigh = 0° to +125°C
2. Pmax = 7.5 W
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. CAdj, when used, is connected between the adjustment pin and ground.
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
800
Vout
15pF
50k
60k
100k
2.0k
15pF
800
750
220
25pF
10k
18k
4.0k
6.0k
100
18k
20k
8.0k
240
5.0pF
100pF
30k
2.0
pF
250
2.2k
270
9.6k
3.0k
1.0k
5.0k
0.2
100k
4.0k
600
2.9k
15
155
2.4k
500
15
500
0.1
Vin
Figure 1. Line Regulation and ∆IAdj/Line Test Circuit
R2
1%
+
Cin
1.0µF
CO
IAdj
R1
Adjust
* Pulse Testing Required:
1% Duty Cycle is suggested.
Vin
LM337M
120
1%
1.0µF
RL
Vout
VOH
VIH
VOL
VIL
*
Line Regulation (%/VO) =
VEE
MOTOROLA ANALOG IC DEVICE DATA
|VOL – VOH|
x 100
|VOH|
3
LM337M
Figure 2. Load Regulation and ∆IAdj/Load Test Circuit
R2
* Pulse Testing required:
1% Duty Cycle is suggested.
1%
CO +
Cin
1.0µF
IAdj
R1
120
1%
1.0µF
*
Adjust
Vin
–Vin
Vout
LM33M
RL
(max
Load)
–VO (min Load)
IL
VO (max Load)
Load Regulation (mV) = VO (min Load) – VO (max Load)
VO (min Load) – VO(max Load)
x 100
VO (min Load)
Load Regulation (%/VO) =
Figure 3. Standard Test Circuit
1%
R2
+
Cin
VI
CO
1.0µF
1.0µF
VO
RL
Vref
IAdj
R1
120
Adjust
Vin
LM337M
To Calculate R2:
R2 =
VO
Vref
Vout
IL
– 1 R1
Pulse Testing Required: 1% Duty Cycle is suggested.
This assumes IAdj is negligible.
Figure 4. Ripple Rejection Test Circuit
+
R2
Cin
CAdj
1%
CO
1.0µF
Adjust
Vin
10µF
LM337M
R1
120
D1 *
+
1.0µF
RL
VO
1N4002
Vout
Vout = –1.25 V
14.3V
*D1 Discharges CAdj if Output is shorted to Ground.
4.3V
f = 120 Hz
4
MOTOROLA ANALOG IC DEVICE DATA
LM337M
Figure 6. Current Limit
4
0.2
0
IL = 0.5 A
–0.2
–0.4
–0.6
–0.8
Vin = –15 V
Vout = –10 V
–1.0
IO, OUTPUT CURRENT (A)
∆ V O , OUTPUT VOLTAGE CHANGE (%)
Figure 5. Load Regulation
3
TJ = 25°C
2
TJ = 150°C
–1.2
–1.4
–50
–25
0
25
50
75
100 125
TJ, JUNCTION TEMPERATURE (°C)
0
150
0
10
20
30
VI – VO, INPUT VOLTAGE DIFFERENTIAL (Vdc)
Figure 7. Adjustment Pin Current
40
Figure 8. Dropout Voltage
3.0
V in –Vout , INPUT–OUTPUT VOLTAGE
DIFFERENTIAL (Vdc)
80
IAdj, ADJUSTMENT CURRENT ( µ A)
TJ = 55°C
1
75
70
65
60
55
50
45
Vout = –5.0 V
∆Vout = 100 mV
2.5
2.0
IL = 500 mA
IL = 200 mA
1.5
IL = 20 mA
1.0
40
–50
–25
0
25
50
75
100
125
150
–50
–25
0
25
50
75
100
125
150
TJ, JUNCTION TEMPERATURE (°C)
TJ, JUNCTION TEMPERATURE (°C)
Figure 9. Temperature Stability
Figure 10. Minimum Operating Current
IB , QUIESCENT CURRENT (mA)
Vref, REFERENCE VOLTAGE (V)
1.270
1.260
1.250
1.240
1.8
TJ = –55°C
1.6
TJ = 25°C
1.4
1.2
TJ = 150°C
1.0
0.8
0.6
0.4
0.2
0
1.230
–50
–25
0
25
50 75
100 125
TJ, JUNCTION TEMPERATURE (°C)
MOTOROLA ANALOG IC DEVICE DATA
150
0
10
20
30
40
Vin–Vout, INPUT–OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
5
LM337M
Figure 11. Ripple Rejection versus Output Voltage
Figure 12. Ripple Rejection versus Output Current
100
CAdj = 10 µF
80
60
RR, RIPPLE REJECTION (dB)
RR, RIPPLE REJECTION (dB)
100
Without CAdj
40
Vin – Vout = 5.0 V
IL = 500 mA
f = 120 Hz
TJ = 25°C
20
0
0
–5
–10
–15
–20
–25
–30
VO, OUTPUT VOLTAGE (V)
–35
CAdj = 10 µF
80
Without CAdj
60
40
20
Vin = –15 V
Vout = –10 V
f = 120 Hz
TJ = 25°C
0
0.01
–40
0.1
1.0
IO, OUTPUT CURRENT (A)
Figure 13. Ripple Rejection versus Frequency
Figure 14. Output Impedance
101
CAdj = 10 µF
60
40
Without CAdj
20
Vin = –15 V
Vout = –10 V
IL = 500 mA
TJ = 25°C
100
1.0 k
10 k 100 k 1.0 M
f, FREQUENCY (Hz)
100
10–1
Vin = –15 V
Vout = –10 V
IL = 500 mA
CL = 1.0 µF
TJ = 25°C
Without CAdj
10–2
CAdj = 10µF
10–3
10
10 M
100
Figure 15. Line Transient Response
0.6
0.4
Without CAdj
0
–0.2
–0.4
CAdj = 10 µF
Vout = –10 V
IL = 50 mA
TJ = 25°C
CL = 1.0 µF
0
–0.5
–1.0
0
10
20
t, TIME (µs)
10 k
100 k
1M
Figure 16. Load Transient Reponse
0.8
0.2
1.0 k
f, FREQUENCY (Hz)
∆ Vout , OUTPUT VOLTAGE
DEVIATION (V)
∆ Vout , OUTPUT VOLTAGE
DEVIATION (V)
0
10
∆ Vin , INPUT VOLTAGE
CHANGE (V)
Z O , OUTPUT IMPEDANCE ( Ω )
80
I L , LOAD
CURRENT (A)
RR, RIPPLE REJECTION (dB)
100
6
10
30
40
0.6
0.4
Without CAdj
0.2
0
CAdj = 10 µF
–0.2
–0.4
–0.6
Vin = –15 V
Vout = –10 V
INL = 50 mA
TJ = 25°C
CL = 1.0 µF
0
–0.5
–1.0
–1.5
0
10
20
t, TIME (µs)
30
40
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
–1.25 V reference (Vref) between its output and adjustment
terminals. This reference voltage is converted to a
programming current (IPROG) by R1 (see Figure 17), and this
constant current flows through R2 to ground. The regulated
output voltage is given by:
R2
Vout = Vref (1 +
) + IAdj R2
R1
Since the current into the adjustment terminal (IAdj)
represents an error term in the equation, the LM337M was
designed to control IAdj to less than 100 µA and keep it
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.
Figure 17. Basic Circuit Configuration
+
IAdj
Adjust
Vin
LM337M
Vref
R2
IPRONG
+
CO
degrading regulation. The ground end of R2 can be returned
near the load ground to provide remote ground sensing and
improve load regulation.
External Capacitors
A 1.0 µF tantalum input bypass capacitor (Cin) is
recommended to reduce the sensitivity to input line
impedance.
The adjustment terminal may be bypassed to ground to
improve ripple rejection. This capacitor (CAdj) prevents ripple
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.
An output capacitance (CO) in the form of a 1.0 µF
tantalum or 10 µF aluminum electrolytic capacitor is required
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
high capacitance values (CO > 25 µF, CAdj > 10 µF). Diode D1
prevents CO from discharging thru the IC during an input
short circuit. Diode D2 protects against capacitor CAdj
discharging through the IC during an output short circuit. The
combination of diodes D1 and D2 prevents CAdj from
discharging through the IC during an input short circuit.
Vout
R1
Figure 18. Voltage Regulator with
Protection Diodes
–
Vout
+
R2
Vref = –1.25 V Typically
Load Regulation
The LM337M is capable of providing extremely good load
regulation, but a few precautions are needed to obtain
maximum performance. For best performance, the
programming resistor (R1) should be connected as close to
the regulator as possible to minimize line drops which
effectively appear in series with the reference, thereby
MOTOROLA ANALOG IC DEVICE DATA
+
CAdj
+
+
Adjust
–Vin
Vout
CO
Cin
R1
D2
LM337M
Vin
–
Vout
1N4002
D1
1N4002
7
LM337M
OUTLINE DIMENSIONS
T SUFFIX
PLASTIC PACKAGE
CASE 221A–06
ISSUE Y
–T–
B
C
F
T
S
SEATING
PLANE
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.
4
A
Q
1 2 3
U
H
K
Z
L
R
V
J
G
D
N
DIM
A
B
C
D
F
G
H
J
K
L
N
Q
R
S
T
U
V
Z
INCHES
MIN
MAX
0.570
0.620
0.380
0.405
0.160
0.190
0.025
0.035
0.142
0.147
0.095
0.105
0.110
0.155
0.018
0.025
0.500
0.562
0.045
0.060
0.190
0.210
0.100
0.120
0.080
0.110
0.045
0.055
0.235
0.255
0.000
0.050
0.045
–––
–––
0.080
MILLIMETERS
MIN
MAX
14.48
15.75
9.66
10.28
4.07
4.82
0.64
0.88
3.61
3.73
2.42
2.66
2.80
3.93
0.46
0.64
12.70
14.27
1.15
1.52
4.83
5.33
2.54
3.04
2.04
2.79
1.15
1.39
5.97
6.47
0.00
1.27
1.15
–––
–––
2.04
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8
◊
*LM337M/D*
MOTOROLA ANALOG IC DEVICE
DATA
LM337M/D