MOTOROLA LM337T2, LM337AT, LM337AD2TR4, LM337AD2T, LM337D2TR4 Datasheet
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Order this document by LM337/D
Device
Operating
Temperature Range
Package
ORDERING INFORMATION
LM337D2T
LM337T
Surface Mount
Insertion Mount
LM337BD2T
LM337BT
TJ = –40° to +125°C
Surface Mount
Insertion Mount
TJ = 0° to +125°C
SEMICONDUCTOR
TECHNICAL DATA
THREE–TERMINAL
ADJUSTABLE NEGATIVE
VOLTAGE REGULATOR
Pin 1. Adjust
2. V
in
3. V
out
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
3
1
2
D2T SUFFIX
PLASTIC PACKAGE
CASE 936
(D2PAK)
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
3
1
2
1
MOTOROLA ANALOG IC DEVICE DATA
The LM337 is an adjustable 3–terminal negative voltage regulator
capable of supplying in excess of 1.5 A 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 LM337 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 LM337 can be used as a precision current regulator.
• Output Current in Excess of 1.5 A
• Output Adjustable between –1.2 V and –37 V
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting Constant with Temperature
• Output Transistor Safe–Area Compensation
• Floating Operation for High Voltage Applications
• Eliminates Stocking many Fixed Voltages
• Available in Surface Mount D
2
PAK and Standard 3–Lead Transistor
Package
Standard Application
V
out
+
–1.25 Vǒ1
)
R
2
R
1
Ǔ
*Cin is required if regulator is located more than 4 inches from power supply filter.
*A 1.0
µ
F 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.
LM337
I
PROG
Cin*
1.0
µ
F
+
–V
in
V
in
V
out
–V
out
CO**
1.0 µF
+
I
Adj
R
1
120
R
2
Motorola, Inc. 1996 Rev 1
LM337
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
Rating Symbol Value Unit
Input–Output Voltage Differential VI–V
O
40 Vdc
Power Dissipation
Case 221A
TA = +25°C P
D
Internally Limited W
Thermal Resistance, Junction–to–Ambient θ
JA
65 °C/W
Thermal Resistance, Junction–to–Case θ
JC
5.0 °C/W
Case 936 (D2PAK)
TA = +25°C P
D
Internally Limited W
Thermal Resistance, Junction–to–Ambient θ
JA
70 °C/W
Thermal Resistance, Junction–to–Case θ
JC
5.0 °C/W
Operating Junction Temperature Range T
J
–40 to +125 °C
Storage Temperature Range T
stg
–65 to +150 °C
ELECTRICAL CHARACTERISTICS (|V
I–VO
| = 5.0 V; IO = 0.5 A for T package; TJ = T
low
to T
high
[Note 1]; I
max
and P
max
[Note 2].)
Characteristics
Figure Symbol Min Typ Max Unit
Line Regulation (Note 3), TA = +25°C, 3.0 V ≤ |VI–VO| ≤ 40 V 1 Reg
line
– 0.01 0.04 %/V
Load Regulation (Note 3), TA = +25°C, 10 mA ≤ IO ≤ I
max
|VO| ≤ 5.0 V
|VO| ≥ 5.0 V
2 Reg
load
–
–
15
0.3
50
1.0
mV
% V
O
Thermal Regulation, TA = +25°C (Note 6), 10 ms Pulse Reg
therm
– 0.003 0.04 % VO/W
Adjustment Pin Current 3 I
Adj
– 65 100 µA
Adjustment Pin Current Change, 2.5 V ≤ |VI–VO| ≤ 40 V,
10 mA ≤ IL ≤ I
max
, PD ≤ P
max
, TA = +25°C
1, 2 ∆I
Adj
– 2.0 5.0 µA
Reference Voltage, TA = +25°C, 3.0 V ≤ |VI–VO| ≤ 40 V,
10 mA ≤ IO ≤ I
max
, PD ≤ P
max
, TJ = T
low
to T
high
3 V
ref
–1.213
–1.20
–1.250
–1.25
–1.287
–1.30
V
Line Regulation (Note 3), 3.0 V ≤ |VI–VO| ≤ 40 V 1 Reg
line
– 0.02 0.07 %/V
Load Regulation (Note 3), 10 mA ≤ IO ≤ I
max
|VO| ≤ 5.0 V
|VO| ≥ 5.0 V
2 Reg
load
–
–
20
0.3
70
1.5
mV
% V
O
Temperature Stability (T
low
≤ TJ ≤ T
high
) 3 T
S
– 0.6 – % V
O
Minimum Load Current to Maintain Regulation
(|VI–VO| ≤ 10 V)
(|VI–VO| ≤ 40 V)
3 I
Lmin
–
–
1.5
2.5
6.0
10
mA
Maximum Output Current
|VI–VO| ≤ 15 V, PD ≤ P
max
, T Package
|VI–VO| ≤ 40 V, PD ≤ P
max
, TJ = +25°C, T Package
3 I
max
–
–
1.5
0.15
2.2
0.4
A
RMS Noise, % of VO, TA = +25°C, 10 Hz ≤ f ≤ 10 kHz N – 0.003 – % V
O
Ripple Rejection, VO = –10 V, f = 120 Hz (Note 4)
Without C
Adj
C
Adj
= 10 µF
4 RR
–
66
60
77
–
–
dB
Long–Term Stability, TJ = T
high
(Note 5), TA = +25°C for
Endpoint Measurements
3 S – 0.3 1.0 %/1.0 k
Hrs.
Thermal Resistance Junction–to–Case, T Package R
θJC
– 4.0 – °C/W
NOTES: 1.T
low
to T
high
= 0° to +125°C, for LM337T, D2T. T
low
to T
high
= –40° to +125°C, for LM337BT, BD2T.
2.I
max
= 1.5 A, P
max
= 20 W
3.Load and line regulation are specified at constant junction temperature. Change in VO because of heating effects is covered under the Thermal
Regulation specification. Pulse testing with a low duty cycle is used.
4.C
Adj
, 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.
6.Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die. These
effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these temperature gradients
on the output voltage and is expressed in percentage of output change per watt of power change in a specified time.
LM337
3
MOTOROLA ANALOG IC DEVICE DATA
Representative Schematic Diagram
Figure 1. Line Regulation and ∆I
Adj
/Line Test Circuit
*
V
OH
V
OL
Line Regulation ( %ńV)
+
|VOL–VOH|
|VOH|
x 100
LM337
100
2.5k
2.0k
60
810
10k
15pF
800
220
5.0k
75
0
60k 100k
18k
800
4.0k
6.0k
1.0k
9.6k
3.0k
2.2k
100
18k
21k
270
100pF
5.0pF
240
2.0
pF
250
8.0k
20k
100k
5.0k
0.2
15
600
2.9k
4.0k
500
2.4k
15
155
0.05
V
in
500
Adjust
V
out
2.0k
25pF
15pF
C
in
1.0 µF
R21%
C
O
+
R
L
Adjust
V
in
V
out
R
1
120
1%
V
EE
* Pulse testing required.
1% Duty Cycle
is suggested.
1.0 µF
V
IH
V
IL
I
Adj
This device contains 39 active transistors.
30k
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