UNISONIC TECHNOLOGIES CO., LTD
LM2937
500mA LOW DROPOUT
VOLTAGE REGULATOR
1
DESCRIPTION
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.
LINEAR INTEGRATED CIRCUIT
TO-220
1
TO-263
1
TO-263-3
1
TO-263-5
*Pb-free plating product number:LM2937L-X
X
FEATURES
* Fully specified for operation over -40°C~ +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
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
LM2937-xx-TA3-T
LM2937L-xx-TA3-T
LM2937-xx-TQ2-R
LM2937L-xx-TQ2-R
LM2937-xx-TQ2-T
LM2937L-xx-TQ2-T
LM2937-xx-TQ3-R
LM2937L-xx-TQ3-R
LM2937-xx-TQ3-T
LM2937L-xx-TQ3-T
LM2937-xx-TQ5-R
LM2937L-xx-TQ5-R
LM2937-xx-TQ5-T
LM2937L-xx-TQ5-T
Package
TO-220
TO-263
TO-263
TO-263-3
TO-263-3
TO-263-5
TO-263-5
Packing
Tube
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
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Copyright © 2005 Unisonic Technologies Co., Ltd
1 of 10
QW-R102-012.F
LM2937
ORDERING INFORMATION (Cont.)
LM2937L-xx-TA3-R
LINEAR INTEGRATED CIRCUIT
(1)Packing Type
(2)Package Type
(3)Output Voltage Code
(4)Lead Plating
(1) R: Tape Reel, T: Tube
(2) TA3: TO-220, TQ2: TO-263, TQ3: TO-263-3,
TQ 5: TO-263-5
(3) xx: refer to Marking Information
(4) L: Lead Free Plating, Blank: Pb/Sn
PIN CONFIGURATION
PIN NO.
TO-263/TO-263-3/TO-220
1
2
3
-
-
TO-263-5
4
3
5
1
2
PIN NAME
Input
GND
Output
N/C
ON/OFF
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
TO-220
TO-263
TO-263-3
UTC
LM2937
33
50
80
10
12
15
:3.3V
:5.0V
:8.0V
:10V
:12V
:15V
VOLTAGECODE
LEAD PLATING
DATE CODE
1
2
3
TO-263-5
UTC
LM2937
VOLTAGE CODE
LEAD PLATING
DATE CODE
1 2 3 4 5
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QW-R102-012.F
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 125
°
C and
the electrical specifications do not apply. If the die temperature rises above 150
°
C, the LM2937 will go into
thermal shutdown.
THERMAL DATA
PARAMETER
Thermal Resistance Junction- Ambient
TO-220
TO-263
TO-263-5
TO-220
Thermal Resistance Junction- Case
TO-263
TO-263-5
θ
JC
SYMBOL
θ
JA
RATINGS
65
73
73
3
4
4
UNIT
°
C/W
ELECTRICAL CHARACTERISTICS
(V
IN
=V
NOM
+5V, I
OUT
=500mA, C
OUT
=10µF, T
J
=Ta=25
°
C, unless otherwise specified.)
For LM2937-3.3V
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
TEST CONDITIONS
5mA≤I
OUT
≤500mA
V
OUT
+2V≤V
IN
≤26V,
I
OUT
=5mA
5mA≤I
OUT
≤500mA
(V
O
+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
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
MIN
3.21
TYP
3.30
9
3
2
10
100
12
0.5
110
1.0
75
-30
-75
TYP
5.00
15
5
2
10
150
20
0.5
110
MAX
3.39
30
30
10
20
UNIT
V
mV
mV
mA
mA
µVrms
mV
V
mV
A
V
V
V
UNIT
V
mV
mV
mA
mA
µVrms
mV
V
mV
1.0
250
0.6
60
-15
-50
MIN
4.85
For LM2937-5.0V
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Quiescent Current
Output Noise Voltage
Long Term Stability
Dropout Voltage
MAX
5.15
50
50
10
20
1.0
250
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QW-R102-012.F
LM2937
ELECTRICAL CHARACTERISTICS (Cont.)
PARAMETER
Short Circuit Current
Peak Line Transient Voltage
Reverse DC Input Voltage
Reverse Transient Input Voltage
SYMBOL
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
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
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
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
= 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
MIN
0.6
60
-15
-50
MIN
7.76
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
TYP
12.00
36
12
2
10
360
44
0.5
110
1.0
75
-30
-75
MAX
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
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
MAX
8.24
80
80
10
20
1.0
250
0.6
60
-15
-50
MIN
9.70
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
MAX
10.30
100
100
10
20
1.0
250
0.6
60
-15
-50
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
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
MAX
12.36
120
120
10
20
1.0
250
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QW-R102-012.F
LM2937
ELECTRICAL CHARACTERISTICS (Cont.)
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
SYMBOL
V
OUT
△
V
OUT
△
V
OUT
I
Q
eN
V
D
I
SC
T
IN
V
RIN
V
TRRI
LINEAR INTEGRATED CIRCUIT
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
15.00
45
15
2
10
450
56
0.5
110
1.0
75
-30
-75
MAX
15.45
150
150
10
20
1.0
250
UNIT
V
mV
mV
mA
mA
µVrms
mV
V
mV
A
V
V
V
ON/OFF CONTROL (For 5 pins only)
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
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
μ
A
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QW-R102-012.F
Embedded System
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