UTC LM2937-XX LINEAR INTEGRATED CIRCUIT
500mA LOW DROPOUT VOLTAGE
REGULATOR
DESCRIPTION
The UTC LM2937-XX 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-XX 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-XX is stable for
all ESR below 3
Ω
.This allows the use of low ESR chip
capacitors.
Ideally suited for automotive applications, the UTC
LM2937-XX 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.
1
T0-220
1
TO-263-5
1
T0-263
TO-220/TO263 :
TO-263-5 : 1: N/C
1:Input
2:GND
3:Output
2: ON/OFF
5: Output
3: GND
4: Input
FEATURES
*Fully specified for operation over -40°C to +125°C
*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
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R102-012,C
UTC LM2937-XX LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION
U N R E G U LA T E D
IN P U T
C in *
10
μ
F
V
IN
1
L M 2 9 3 7 -X X
2
3
V
OUT
R E G U LA T E D
OUTPUT
C
OU T
**
1 0
μ
F
I
Q
ON/OFF CONTROL APPLICATION
U N R E G U LA T E D
IN P U T
C in *
10
μ
F
V
IN
4
L M 2 9 3 7 -X X
N /C
1
3
5
V
OUT
R E G U LA T E D
OUTPUT
C
OU T
**
1 0
μ
F
I
Q
2
O N /O F F
* Required if the regulator is located more than 3 inches from the power supply filter capacitors.
**Required for stability. C
OUT
must be at least 10µF(over the full expected operating temperature range) and located
as close as possible to the regulator. The equivalent series resistance, ESR ,of this capacitor may be as high as
3Ω.
ABSOLUTE MAXIMUM RATINGS(Note 1)
PARAMETER
Internal Power Dissipation(Note 2)
Input Voltage
Storage temperature Range
Maximum Junction Temperature
SYMBOL
V
IN
Tstg
Tj
RATING
Internally limited
26
-65 ~ +150
150
UNIT
V
°C
°C
LM2937-3.3V ELECTRICAL CHARACTERISTICS
( V
IN
=V
NOM
+5V,I
O
=500mA,C
out
=10µF, Tj=T
A
=25°C ,unless otherwise specified )
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Output Noise Voltage
Long Term Stability
SYMBOL
V
o
△V
O
△V
O
I
Q
V
NOISE
TEST CONDITIONS
5mA≤I
O
≤500mA
Vo+2V≤V
IN
≤26V,
I
O
=5mA
5mA≤I
O
≤500mA
(Vo+2V)≤V
IN
≤26V,I
O
=5mA
V
IN
= Vo+5V, I
O
=500mA
10Hz-100kHz, I
O
=5mA
1000Hrs
MIN.
3.21
TYP.
3.30
9
3
2
10
100
12
MAX.
3.39
30
30
10
20
UNIT.
V
mV
mV
mA
mA
µVrms
mV
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R102-012,C
UTC LM2937-XX LINEAR INTEGRATED CIRCUIT
PARAMETER
Dropout Voltage
Short Circuit Current
Peak Line Transient Voltage
Reverse DC Input Voltage
Reverse Transient Input
Voltage
SYMBOL
V
D
I
S
T
in
V
Rin
V
TRRI
TEST CONDITIONS
I
O
=500mA
I
O
=50mA
tf≤100ms ,R
L
=100Ω
V
O
≥-0.6V
,R
L
=100Ω
tf<1ms ,R
L
=100Ω
MIN.
TYP.
0.5
110
1.0
75
-30
-75
MAX.
1.0
250
UNIT.
V
mV
A
V
V
V
0.6
60
-15
-50
LM2937-5.0V ELECTRICAL CHARACTERISTICS
(V
IN
=V
NOM
+5V,I
O
=500mA,C
out
=10µF, Tj=T
A
=25°C,,unless otherwise specified )
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
o
△V
O
△V
O
I
Q
V
NOISE
V
D
I
S
T
in
V
Rin
V
TRRI
TEST CONDITIONS
5mA≤I
O
≤500mA
Vo+2V≤V
IN
≤26V,
I
O
=5mA
5mA≤I
O
≤500mA
(Vo+2V)≤V
IN
≤26V,I
O
=5mA
V
IN
= Vo+5V, I
O
=500mA
10Hz-100kHz, I
O
=5mA
1000Hrs
I
O
=500mA
I
O
=50mA
tf≤100ms ,R
L
=100Ω
V
O
≥-0.6V
,R
L
=100Ω
tf<1ms ,R
L
=100Ω
MIN.
4.85
TYP.
5.00
15
5
2
10
150
20
0.5
110
1.0
75
-30
-75
MAX.
5.15
50
50
10
20
UNIT.
V
mV
mV
mA
mA
µVrms
mV
V
mV
A
V
V
V
1.0
250
0.6
60
-15
-50
LM2937-8.0V ELECTRICAL CHARACTERISTICS
(V
IN
=V
NOM
+5V,I
O
=500mA,C
out
=10µF, Tj=T
A
=25°C,,unless otherwise specified )
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
o
△V
O
△V
O
I
Q
V
NOISE
V
D
I
S
T
in
V
Rin
V
TRRI
TEST CONDITIONS
5mA≤I
O
≤500mA
Vo+2V≤V
IN
≤26V,
I
O
=5mA
5mA≤I
O
≤500mA
(Vo+2V)≤V
IN
≤26V,I
O
=5mA
V
IN
= Vo+5V, I
O
=500mA
10Hz-100kHz, I
O
=5mA
1000Hrs
I
O
=500mA
I
O
=50mA
tf≤100ms ,R
L
=100Ω
V
O
≥-0.6V
,R
L
=100Ω
tf<1ms ,R
L
=100Ω
MIN.
7.76
TYP.
8.00
24
8
2
10
240
32
0.5
110
1.0
75
-30
-75
MAX.
8.24
80
80
10
20
UNIT.
V
mV
mV
mA
mA
µVrms
mV
V
mV
A
V
V
V
1.0
250
0.6
60
-15
-50
LM2937-10.0V ELECTRICAL CHARACTERISTICS
(V
IN
=V
NOM
+5V,I
O
=500mA,C
out
=10µF, Tj=T
A
=25°C,,unless otherwise specified )
PARAMETER
Output Voltage
Line Regulation
SYMBOL
V
o
△V
O
TEST CONDITIONS
5mA≤I
O
≤500mA
Vo+2V≤V
IN
≤26V,
I
O
=5mA
MIN.
9.70
TYP.
10.00
30
MAX.
10.30
100
UNIT.
V
mV
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R102-012,C
UTC LM2937-XX LINEAR INTEGRATED CIRCUIT
PARAMETER
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
O
I
Q
V
NOISE
V
D
I
S
T
in
V
Rin
V
TRRI
TEST CONDITIONS
5mA≤I
O
≤500mA
(Vo+2V)≤V
IN
≤26V,I
O
=5mA
V
IN
= Vo+5V, I
O
=500mA
10Hz-100kHz, I
O
=5mA
1000Hrs
I
O
=500mA
I
O
=50mA
tf≤100ms ,R
L
=100Ω
V
O
≥-0.6V
,R
L
=100Ω
tf<1ms ,R
L
=100Ω
MIN.
TYP.
10
2
10
300
40
0.5
110
1.0
75
-30
-75
MAX.
100
10
20
UNIT.
mV
mA
mA
µVrms
mV
V
mV
A
V
V
V
1.0
250
0.6
60
-15
-50
LM2937-12.0V ELECTRICAL CHARACTERISTICS
(V
IN
=V
NOM
+5V,I
O
=500mA,C
out
=10µF, Tj=T
A
=25°C,,unless otherwise specified )
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
o
△V
O
△V
O
I
Q
V
NOISE
V
D
I
S
T
in
V
Rin
V
TRRI
TEST CONDITIONS
5mA≤I
O
≤500mA
Vo+2V≤V
IN
≤26V,
I
O
=5mA
5mA≤I
O
≤500mA
(Vo+2V)≤V
IN
≤26V,I
O
=5mA
V
IN
= Vo+5V, I
O
=500mA
10Hz-100kHz, I
O
=5mA
1000Hrs
I
O
=500mA
I
O
=50mA
tf≤100ms ,R
L
=100Ω
V
O
≥-0.6V
,R
L
=100Ω
tf<1ms ,R
L
=100Ω
MIN.
11.64
TYP.
12.00
36
12
2
10
360
44
0.5
110
1.0
75
-30
-75
MAX.
12.36
120
120
10
20
UNIT.
V
mV
mV
mA
mA
µVrms
mV
V
mV
A
V
V
V
1.0
250
0.6
60
-15
-50
LM2937-15.0V ELECTRICAL CHARACTERISTICS
(V
IN
=V
NOM
+5V,I
O
=500mA,C
out
=10µF, Tj=T
A
=25°C,,unless otherwise specified )
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
o
△V
O
△V
O
I
Q
V
NOISE
V
D
I
S
T
in
V
Rin
V
TRRI
TEST CONDITIONS
5mA≤I
O
≤500mA
Vo+2V≤V
IN
≤26V,
I
O
=5mA
5mA≤I
O
≤500mA
(Vo+2V)≤V
IN
≤26V,I
O
=5mA
V
IN
= Vo+5V, I
O
=500mA
10Hz-100kHz, I
O
=5mA
1000Hrs
I
O
=500mA
I
O
=50mA
tf≤100ms ,R
L
=100Ω
V
O
≥-0.6V
,R
L
=100Ω
tf<1ms ,R
L
=100Ω
MIN.
14.55
TYP.
15.00
45
15
2
10
450
56
0.5
110
1.0
75
-30
-75
MAX.
15.45
150
150
10
20
UNIT.
V
mV
mV
mA
mA
µVrms
mV
V
mV
A
V
V
V
1.0
250
0.6
60
-15
-50
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R102-012,C
UTC LM2937-XX LINEAR INTEGRATED CIRCUIT
ON/OFF CONTROL
PARAMETER
ON/OFF Threshold Voltage
ON
ON/OFF Threshold Voltage
OFF
ON/OFF Threshold Current
SYMBOL
V
ON
V
OFF
I
ON/OFF
TEST CONDITIONS
I
O≦
0.5A
I
O≦
0.5A
V
ON/OFF=
2.0V,Io=0.5A
MIN.
TYP.
MAX.
0.8
UNIT.
V
V
2.0
50
100
μA
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 LM2937 will go into
thermal shutdown. For the LM2937, the junction to ambient thermal resistance
ΘJA
is 65°C/W, for the
TO-220 package and 73°C/W for the TO-263 package. When used with a heat sink,
Θ
JA
is the sum of the
LM2937 junction to case thermal resistance
Θ
JC
of 3°C/W and the heat sink case to ambient thermal
resistance. If the TO-263 package is used, the thermal resistance can be reduced by increasing P.C. board
copper area thermally connected to the package.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
5
QW-R102-012,C
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