The small physical size of the SOT-223 package does not allow sufficient space to provide the complete device part number. The actual devices will be labeled with
the package markings shown.
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2
LM2937-2.5, LM2937-3.3
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage
Continuous
Transient (t
≤
100 ms)
Internal Power Dissipation (Note 2)
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature Soldering
TO-220 (10 seconds)
TO-263 (10 seconds)
260˚C
230˚C
26V
60V
Internally Limited
150˚C
−65˚C to +150˚C
SOT-223 (Vapor Phase, 60 seconds) 215˚C
SOT-223 (Infrared, 15 seconds)
ESD Susceptibility (Note 3)
220˚C
2 kV
Operating Conditions
(Note 1)
Temperature Range (Note 2)
LM2937ES, LM2937ET
−40˚C
≤
T
A
≤
125˚C
−40˚C
≤
T
A
≤
85˚C
4.75V to 26V
LM2937IMP
Input Voltage Range
Electrical Characteristics
(Note 4)
V
IN
= V
NOM
+ 5V, I
OUTmax
= 500 mA for the TO-220 and TO-263 packages, I
OUTmax
=400mA for the SOT-223 package, C
OUT
=
10 µF unless otherwise indicated.
Boldface limits apply over the entire operating temperature range, of the indicated de-
vice,
all other specifications are for T
A
= T
J
= 25˚C.
Output Voltage (V
OUT
)
Parameter
Output Voltage
Conditions
5 mA
≤
I
OUT
≤
I
OUTmax
2.5
Typ
2.5V
Limit
2.42
2.38
2.56
2.62
Line Regulation(Note 5)
Load Regulation
Quiescent Current
4.75V
≤
V
IN
≤
26V,
I
OUT
= 5 mA
5 mA
≤
I
OUT
≤
I
OUTmax
7V
≤
V
IN
≤
26V,
I
OUT
= 5 mA
V
IN
= (V
OUT
+ 5V),
I
OUT
= I
OUTmax
V
IN
= 5V, I
OUT
= I
OUTmax
Output Noise
Voltage
Long Term Stability
Short-Circuit Current
Peak Line Transient
Voltage
Maximum Operational
Input Voltage
Reverse DC
Input Voltage
Reverse Transient
Input Voltage
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
outside of its rated Operating Conditions.
Note 2:
The maximum allowable power dissipation at any ambient temperature is P
MAX
= (125 − T
A
)/θ
JA
, where 125 is the maximum junction temperature for
operation, T
A
is the ambient temperature, and
θ
JA
is the junction-to-ambient thermal resistance. If this dissipation is exceeded, the die temperature will rise above
125˚C and the electrical specifications do not apply. If the die temperature rises above 150˚C, the regulator will go into thermal shutdown. The junction-to-ambient
thermal resistance
θ
JA
is 65˚C/W, for the TO-220 package, 73˚C/W for the TO-263 package, and 174˚C/W for the SOT-223 package. When used with a heatsink,
θ
JA
is the sum of the device junction-to-case thermal resistance
θ
JC
of 3˚C/W and the heatsink case-to-ambient thermal resistance. If the TO-263 or SOT-223
packages are used, the thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package (see Application Hints for
more information on heatsinking).
Note 3:
ESD rating is based on the human body model, 100 pF discharged through 1.5 kΩ.
Note 4:
Typicals are at T
J
= 25˚C and represent the most likely parametric norm.
3.3V
Typ
3.3
Limit
3.20
3.14
3.40
3.46
9.9
3.3
2
10
66
99
13.2
0.6
60
26
1.0
75
0.6
60
26
−30
−75
−15
−50
33
33
10
20
100125
Units
V (Min)
V(Min)
V(Max)
V(Max)
mV(Max)
mV(Max)
mA(Max)
mA(Max)
mA(Max)
µVrms
mV
A(Min)
V(Min)
V(Min)
V(Min)
V(Min)
7.5
2.5
2
10
66
75
10
1.0
75
25
25
10
20
100125
10 Hz–100 kHz,
I
OUT
= 5 mA
1000 Hrs.
t
f
<
100 ms, R
L
= 100Ω
V
OUT
≥
−0.6V, R
L
= 100Ω
t
r
<
1 ms, R
L
= 100Ω
−30
−75
−15
−50
3
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LM2937-2.5, LM2937-3.3
Electrical Characteristics
(Note 4)
(Continued)
Note 5:
The minimum input voltage required for proper biasing of these regulators is 4.75V. Below this level the outputs will fall out of regulation. This effect is not
the normal dropout characteristic where the output falls out of regulation due to the PNP pass transistor entering saturation. If a value for worst case effective input
to output dropout voltage is required in a specification, the values should be 2.37V maximum for the LM2937-2.5 and 1.6V maximum for the LM2937-3.3.
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