UNISONIC TECHNOLOGIES CO., LTD
LM2937
500mA LOW DROPOUT
VOLTAGE REGULATOR
DESCRIPTION
LINEAR INTEGRATED CIRCUIT
The UTC
LM2937
is a positive voltage regulator capable of supplying
up to 500mA of load current. The use of a PNP power transistor
provides a low dropout voltage characteristic. With a load current of
500mA the minimum input to output voltage differential required for the
output to remain in regulation is typically 0.5V(1V guaranteed maximum
over the full operating temperature range). Special circuitry has been
incorporated to minimize the quiescent current to typically only 10mA
with a full 500mA load current when the input to output voltage
differential is greater than 3V.
The UTC
LM2937
requires an output bypass capacitor for stability.
As with most low dropout regulators, the ESR of this capacitor remains
a critical design parameter, but the LM2937 includes special
compensation circuitry that relaxes ESR requirements. The UTC
LM2937
is stable for all ESR below 3Ω.This allows the use of low ESR
chip capacitors.
Ideally suited for automotive applications, the UTC
LM2937
will
protect itself and any load circuitry from reverse battery connections,
two-battery jumps and up to +60V/-50V load dump transients. Familiar
regulator features such as short circuit and thermal shutdown protection
are also built in.
FEATURES
* Fully specified for operation over -40C~ +125C
* Output current in excess of 500mA
* Output trimmed for 5% tolerance under all operating conditions
* Typical dropout voltage of 0.5V at full rated load current
* Wide output capacitor ESR range, up to 3Ω
* Reverse battery protection
* Internal short circuit and thermal overload protection
* 60V input transient protection
* Mirror image insertion protection
* Built-in ON/OFF control function
ORDERING INFORMATION
Order Number
Lead Free
LM2937L-xx-AA3-R
LM2937L-xx-TA3-T
LM2937L-xx-TQ2-R
LM2937L-xx-TQ2-T
LM2937L-xx-TQ3-R
LM2937L-xx-TQ3-T
LM2937L-xx-TQ5-R
LM2937L-xx-TQ5-T
Halogen Free
LM2937G-xx-AA3-R
LM2937G-xx-TA3-T
LM2937G-xx-TQ2-R
LM2937G-xx-TQ2-T
LM2937G-xx-TQ3-R
LM2937G-xx-TQ3-T
LM2937G-xx-TQ5-R
LM2937G-xx-TQ5-T
Package
SOT-223
TO-220
TO-263
TO-263
TO-263-3
TO-263-3
TO-263-5
TO-263-5
Packing
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
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QW-R102-012.I
LM2937
ORDERING INFORMATION (Cont.)
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
PIN NO.
SOT-223/TO-220
TO-263/TO-263-3
1
2
3
-
-
PIN NAME
Input
GND
Output
N/C
ON/OFF
TO-263-5
4
3
5
1
2
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
TO-220
TO-263
TO-263-3
SOT-223
33
50
80
10
12
15
:3.3V
:5.0V
:8.0V
:10V
:12V
:15V
TO-263-5
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QW-R102-012.I
LM2937
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PARAMETER
LINEAR INTEGRATED CIRCUIT
SYMBOL
RATINGS
UNIT
Input Voltage
V
IN
26
V
Power Dissipation(Note 2)
P
D
Internally limited
Maximum Junction Temperature
T
J
+150
C
Storage Temperature
T
STG
-40 ~ +150
C
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.
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 125C and
the electrical specifications do not apply. If the die temperature rises above 150C, the LM2937 will go into
thermal shutdown.
THERMAL DATA
PARAMETER
SYMBOL
SOT-223
TO-220
TO-263/ TO-263-5
SOT-223
TO-220
TO-263/ TO-263-5
θ
JA
RATINGS
174
65
73
15
3
4
UNIT
Junction to Ambient
C/W
Junction to Case
θ
JC
ELECTRICAL CHARACTERISTICS
(V
IN
=V
NOM
+5V, I
OUT
=500mA, C
OUT
=10μF, T
J
=Ta=25C, unless otherwise specified.)
For LM2937-3.3V
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
Output Voltage
V
OUT
5mA≤I
OUT
≤500mA
3.21
Line Regulation
△
V
OUT
V
OUT
+2V≤V
IN
≤26V,
I
OUT
=5mA
Load Regulation
△
V
OUT
5mA≤I
OUT
≤500mA
(V
O
+2V)≤V
IN
≤26V,
I
OUT
=5mA
Quiescent Current
I
Q
V
IN
= V
OUT
+5V, I
OUT
=500mA
Output Noise Voltage
eN
10Hz-100kHz, I
OUT
=5mA
Long Term Stability
1000Hrs
I
OUT
=500mA
Dropout Voltage
V
D
I
OUT
=50mA
Short Circuit Current
I
SC
0.6
Peak Line Transient Voltage
T
IN
t
F
≤100ms,
R
L
=100Ω
60
Reverse DC Input Voltage
V
RIN
V
OUT
≥-0.6V,
R
L
=100Ω
-15
Reverse Transient Input Voltage
V
TRRI
t
F
<1ms, R
L
=100Ω
-50
TYP
3.30
9
3
2
10
100
12
0.5
110
1.0
75
-30
-75
MAX
3.39
30
30
10
20
1.0
250
UNIT
V
mV
mV
mA
mA
μVrms
mV
V
mV
A
V
V
V
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QW-R102-012.I
LM2937
ELECTRICAL CHARACTERISTICS (Cont.)
SYMBOL
V
OUT
△
V
OUT
△
V
OUT
I
Q
eN
For LM2937-5.0V
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Output Noise Voltage
Long Term Stability
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
5mA≤I
OUT
≤500mA
V
OUT
+2V≤V
IN
≤26V,
I
OUT
=5mA
5mA≤I
OUT
≤500mA
(V
OUT
+2V)≤V
IN
≤26V,
I
OUT
=5mA
V
IN
= V
OUT
+5V, I
OUT
=500mA
10Hz-100kHz, I
OUT
=5mA
1000Hrs
I
OUT
=500mA
I
OUT
=50mA
TEST CONDITIONS
tF≤100ms, RL=100Ω
VOUT
≥-0.6V,
RL=100Ω
tF<1ms, RL=100Ω
MIN
4.85
Dropout Voltage
V
D
MIN
0.6
60
-15
-50
MIN
7.76
TYP
5.00
15
5
2
10
150
20
0.5
110
TYP
1.0
75
-30
-75
TYP
8.00
24
8
2
10
240
32
0.5
110
1.0
75
-30
-75
TYP
10.00
30
10
2
10
300
40
0.5
110
1.0
75
-30
-75
MAX
5.15
50
50
10
20
1.0
250
MAX
UNIT
V
mV
mV
mA
mA
μVrms
mV
V
mV
UNIT
A
V
V
V
UNIT
V
mV
mV
mA
mA
μVrms
mV
V
mV
A
V
V
V
UNIT
V
mV
mV
mA
mA
μVrms
mV
V
mV
A
V
V
V
For LM2937-8.0V
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Output Noise Voltage
Long Term Stability
Dropout Voltage
Short Circuit Current
Peak Line Transient Voltage
Reverse DC Input Voltage
Reverse Transient Input Voltage
For LM2937-10.0V
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Output Noise Voltage
Long Term Stability
Dropout Voltage
Short Circuit Current
Peak Line Transient Voltage
Reverse DC Input Voltage
Reverse Transient Input Voltage
SYMBOL
V
OUT
△
V
OUT
△
V
OUT
I
Q
eN
V
D
I
SC
T
IN
V
RIN
V
TRRI
SYMBOL
V
OUT
△
V
OUT
△
V
OUT
I
Q
eN
V
D
I
SC
T
IN
V
RIN
V
TRRI
TEST CONDITIONS
5mA≤I
OUT
≤500mA
V
OUT
+2V≤V
IN
≤26V,
I
OUT
=5mA
5mA≤I
OUT
≤500mA
(V
OUT
+2V)≤V
IN
≤26V,I
OUT
=5mA
V
IN
= Vo+5V, I
OUT
=500mA
10Hz-100kHz, I
OUT
=5mA
1000Hrs
I
OUT
=500mA
I
OUT
=50mA
t
F
≤100ms,
R
L
=100Ω
V
OUT
≥-0.6V,
R
L
=100Ω
t
F
<1ms, R
L
=100Ω
TEST CONDITIONS
5mA≤I
OUT
≤500mA
V
OUT
+2V≤V
IN
≤26V,
I
OUT
=5mA
5mA≤I
OUT
≤500mA
(V
OUT
+2V)≤V
IN
≤26V,I
OUT
=5mA
V
IN
= V
OUT
+5V, I
OUT
=500mA
10Hz-100kHz, I
OUT
=5mA
1000Hrs
I
OUT
=500mA
I
OUT
=50mA
t
F
≤100ms
,R
L
=100Ω
V
OUT
≥-0.6V
,R
L
=100Ω
t
F
<1ms ,R
L
=100Ω
MAX
8.24
80
80
10
20
1.0
250
0.6
60
-15
-50
MIN
9.70
MAX
10.30
100
100
10
20
1.0
250
0.6
60
-15
-50
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QW-R102-012.I
LM2937
ELECTRICAL CHARACTERISTICS (Cont.)
SYMBOL
V
OUT
△
V
OUT
△
V
OUT
I
Q
eN
V
D
I
SC
T
IN
V
RIN
V
TRRI
SYMBOL
V
OUT
△
V
OUT
△
V
OUT
I
Q
eN
V
D
I
SC
T
IN
V
RIN
V
TRRI
For LM2937-12.0V
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Output Noise Voltage
Long Term Stability
Dropout Voltage
Short Circuit Current
Peak Line Transient Voltage
Reverse DC Input Voltage
Reverse Transient Input Voltage
For LM2937-15.0V
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Output Noise Voltage
Long Term Stability
Dropout Voltage
Short Circuit Current
Peak Line Transient Voltage
Reverse DC Input Voltage
Reverse Transient Input Voltage
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
MIN
5mA≤I
OUT
≤500mA
11.64
V
OUT
+2V≤V
IN
≤26V,
I
OUT
=5mA
5mA≤I
OUT
≤500mA
(V
OUT
+2V)≤V
IN
≤26V,I
OUT
=5mA
V
IN
= V
OUT
+5V, I
OUT
=500mA
10Hz-100kHz, I
OUT
=5mA
1000Hrs
I
OUT
=500mA
I
OUT
=50mA
0.6
t
F
≤100ms,
R
L
=100Ω
60
V
OUT
≥-0.6V,
R
L
=100Ω
-15
t
F
<1ms, R
L
=100Ω
-50
TEST CONDITIONS
MIN
5mA≤I
OUT
≤500mA
14.55
V
OUT
+2V≤V
IN
≤26V,
I
OUT
=5mA
5mA≤I
OUT
≤500mA
(V
OUT
+2V)≤V
IN
≤26V,I
OUT
=5mA
V
IN
= V
OUT
+5V, I
OUT
=500mA
10Hz-100kHz, I
OUT
=5mA
1000Hrs
I
OUT
=500mA
I
OUT
=50mA
0.6
t
F
≤100ms,
R
L
=100Ω
60
V
OUT
≥-0.6V,
R
L
=100Ω
-15
t
F
<1ms, R
L
=100Ω
-50
TYP
12.00
36
12
2
10
360
44
0.5
110
1.0
75
-30
-75
TYP
15.00
45
15
2
10
450
56
0.5
110
1.0
75
-30
-75
MAX
12.36
120
120
10
20
1.0
250
UNIT
V
mV
mV
mA
mA
μVrms
mV
V
mV
A
V
V
V
UNIT
V
mV
mV
mA
mA
μVrms
mV
V
mV
A
V
V
V
MAX
15.45
150
150
10
20
1.0
250
ON/OFF CONTROL (For 5 pins only)
SYMBOL
V
ON
V
OFF
I
ON/OFF
TEST CONDITIONS
I
OUT
≦0.5A
I
OUT
≦0.5A
V
ON/OFF
=2.0V, I
OUT
=0.5A
MIN
2.0
50
100
TYP
MAX
0.8
UNIT
V
V
μA
PARAMETER
ON/OFF Threshold Voltage ON
ON/OFF Threshold Voltage OFF
ON/OFF Threshold Current
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QW-R102-012.I
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