LM150/LM250
LM350
THREE-TERMINAL 3 A
ADJUSTABLE VOLTAGE REGULATORS
s
s
s
s
s
s
GUARANTEED 3A OUTPUT CURRENT
ADJUSTABLE OUTPUT DOWN TO 1.2V
LINE REGULATION TYPICALLY 0.005%/V
LOAD REGULATION TYPICALLY 0.1%
GUARANTEED THERMAL REGULATION
CURRENT LIMIT CONSTANT WITH
TEMPERATURE
STANDARD 3-LEAD TRANSISTOR
PACKAGE
TO-3
s
SCHEMATIC DIAGRAM
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July 2003
1/9
LM150-LM250-LM350
ABSOLUTE MAXIMUM RATINGS
Symbol
P
tot
V
I
- V
O
T
stg
T
lead
T
oper
Power Dissipation
Input-Output Voltage Differential
Storage Temperature Range
Lead Temperature (Soldering, 10 seconds)
Operating Junction Temperature Range
LM150
LM250
LM350
Parameter
Value
Internally Limited
35
-65 to 150
300
-55 to 150
-25 to 150
0 to 125
V
°C
°C
°C
Unit
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
Symbol
R
thj-case
R
thj-amb
Parameter
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
Value
1.5
35
Unit
°C/W
°C/W
PIN CONNECTION
(Bottom view)
ORDERING CODES
TYPE
LM150
LM250
LM350
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TO-3
TO-3
LM150K
LM250K
LM350K
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TEMPERATURE RANGE
-55°C to 150°C
-25°C to 150°C
0°C to 125°C
2/9
LM150-LM250-LM350
ELECTRICAL CHARACTERISTICS OF LM150/LM250
(T
J
= -55 to 150°C for LM150,
T
J
= -25 to 150°C for LM250, V
I
-V
O
= 5V, I
O
= 1.5 A. Although power dissipation is internally limited, these
specifications apply to power dissipation up to 30W, unless otherwise specified).
Symbol
K
VI
K
VO
Parameter
Line Regulation (Note 1)
Load Regulation (Note 1)
Thermal Regulation
Adjustment Pin Current
Adjustment Pin Current
Change
Reference Voltage
Line Regulation (Note 1)
Load Regulation (Note 1)
Temperature Stability
Minimum Load Current
Current Limit
RMS Output Noise
(% of V
O
)
Ripple Rejection Ratio
Long Term Stability
T
a
= 25°C,
Test Conditions
V
I
- V
O
= 3 to 35 V
V
O
≤
5 V
V
O
≥
5 V
T
a
= 25°C
I
O
= 10 mA to 3 A
Pulse = 20 ms
I
L
= 10 mA to 3 A
V
I
- V
O
= 3 to 35 V
1.19
Min.
Typ.
0.005
5
0.1
0.002
50
0.2
1.24
0.02
20
0.3
1
3.5
DC
V
I
- V
O
= 30 V
3
Max.
0.01
15
0.3
0.01
100
5
1.29
0.05
50
1
Unit
%/V
mV
%
%/W
µA
µA
V
%/V
mV
%
I
adj
∆I
adj
V
ref
K
VI
K
VO
K
VT
I
O(min)
I
O(max)
V
NO
R
vf
K
VH
V
I
- V
O
= 3 to 35 V, I
O
= 10 mA to 3 A
P
≤
30 W
V
I
- V
O
= 3 to 35 V
I
O
= 10 mA to 3 A
T
J
= T
min
to T
max
V
I
- V
O
≤
35 V
V
I
- V
O
≤
10 V
T
a
= 25°C
V
O
≤
5 V
V
O
≥
5 V
f = 10 Hz to 10 KHz
V
O
= 10 V, f = 120 Hz
C
adj
= 10 µF
T
a
= 125°C
Note 1: Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects are taken into account
separately by thermal rejection.
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86
0.3
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5
1
s)
(
%
A
%
mA
0.001
dB
%
3/9
LM150-LM250-LM350
ELECTRICAL CHARACTERISTICS OF LM350
(T
J
= 0 to 150°C for LM150, V
I
-V
O
= 5V, I
O
= 1.5 A.
Although power dissipation is internally limited, these specifications apply to power dissipation up to 30W,
unless otherwise specified).
Symbol
K
VI
K
VO
Parameter
Line Regulation (Note 1)
Load Regulation (Note 1)
Thermal Regulation
Adjustment Pin Current
Adjustment Pin Current
Change
Reference Voltage
Line Regulation (Note 1)
Load Regulation (Note 1)
Temperature Stability
Minimum Load Current
Current Limit
RMS Output Noise
(% of V
O
)
Ripple Rejection Ratio
Long Term Stability
T
a
= 25°C,
Test Conditions
V
I
- V
O
= 3 to 35 V
V
O
≤
5 V
V
O
≥
5 V
T
a
= 25°C
I
O
= 10 mA to 3 A
Pulse = 20 ms
I
L
= 10 mA to 3 A
V
I
- V
O
= 3 to 35 V
1.19
Min.
Typ.
0.005
5
0.1
0.002
50
0.2
1.24
0.02
20
0.3
1
3.5
DC
V
I
- V
O
= 30 V
3
Max.
0.03
25
0.5
0.02
100
5
1.29
0.05
70
1.5
Unit
%/V
mV
%
%/W
µA
µA
V
%/V
mV
%
I
adj
∆I
adj
V
ref
K
VI
K
VO
K
VT
I
O(min)
I
O(max)
V
NO
R
vf
K
VH
V
I
- V
O
= 3 to 35 V, I
O
= 10 mA to 3 A
P
≤
30 W
V
I
- V
O
= 3 to 35 V
I
O
= 10 mA to 3 A
T
J
= T
min
to T
max
V
I
- V
O
≤
35 V
V
I
- V
O
≤
10 V
T
a
= 25°C
V
O
≤
5 V
V
O
≥
5 V
f = 10 Hz to 10 KHz
V
O
= 10 V, f = 120 Hz
C
adj
= 10 µF
T
a
= 125°C
Note 1: Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects are taken into account
separately by thermal rejection.
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86
0.3
ct
u
10
1
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(
%
A
%
mA
0.001
dB
%
4/9
LM150-LM250-LM350
TYPICAL APPLICATIONS
1.2V to 25V ADJUSTABLE REGULATOR
∆
Needed if device is far from filter capacitors.
* Optional-improves transient response. Output capacitors in the range of 1µF to 100µF of aluminium or tantalum electrolytic are commonly
used to provide improved output impedance and rejection of transients
** V
O
= 1.25V (1 + R
2
/R
1
)
*** R
1
= 240Ω for LM150 and LM250
APPLICATION HINTS
In operation, the LM350 develops a nominal 1.25V reference voltage, V
(ref)
, between the output and
adjustment terminal. The reference voltage is impressed across program resistor R
1
and, since the
voltage is constant, a constant current I
1
then flows through the output set resistor R
2
, giving an output
voltage of
V
O
= V
(ref)
(1+ R
2
/R
1
) + I
adj
R
2
Figure 1 :
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Since the 50µA current from the adjustment terminal represents an error term, the LM350 was designed
to minimize I
adj
and make it very constant with line and load changes. To do this, all quiescent operating
current is returned to the output establishing a minimum load current requirement. If there is insufficient
load on the output, the output will rise.
5/9
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