UNISONIC TECHNOLOGIES CO., LTD LM2937

UNISONIC TECHNOLOGIES CO., LTD
LM2937
LINEAR INTEGRATED CIRCUIT
500mA LOW DROPOUT
VOLTAGE REGULATOR

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.

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
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
1 of 10
QW-R102-012.J
LM2937

LINEAR INTEGRATED CIRCUIT
ORDERING INFORMATION
Order Number
Lead Free
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
Packing
SOT-223
TO-220
TO-263
TO-263
TO-263-3
TO-263-3
TO-263-5
TO-263-5
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
SOT-223
TO-220
TO-263
TO-263-3
33
50
80
10
12
15
:3.3V
:5.0V
:8.0V
:10V
:12V
:15V
Lot Code
Voltage Code
UTC
LM2937
L: Lead Free
G: Halogen Free
Date Code
1
2
3
TO-263-5

PIN CONFIGURATION
PIN NO.
SOT-223/TO-220
TO-263/TO-263-3
1
2
3
-
TO-263-5
4
3
5
1
2
PIN NAME
Input
GND
Output
N/C
ON/OFF
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LM2937

LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Note 1)
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
VIN
26
V
Power Dissipation(Note 2)
PD
Internally limited
Maximum Junction Temperature
TJ
+150
C
Storage Temperature
TSTG
-40 ~ +150
C
Notes: 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 PMAX = (125-TA)/ θJA, where 125
is the maximum junction temperature for operation, TA is the ambient temperature, and θJA 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
Junction to Ambient
Junction to Case

SYMBOL
SOT-223
TO-220
TO-263/ TO-263-5
SOT-223
TO-220
TO-263/ TO-263-5
θJA
θJC
RATINGS
174
65
73
15
3
4
UNIT
C/W
ELECTRICAL CHARACTERISTICS
(VIN=VNOM+5V, IOUT=500mA, COUT=10μF, TJ=Ta=25C, unless otherwise specified.)
For LM2937-3.3V
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
Output Voltage
VOUT
5mA≤IOUT≤500mA
3.21
Line Regulation
△VOUT
VOUT+2V≤VIN≤26V, IOUT=5mA
Load Regulation
△VOUT
5mA≤IOUT≤500mA
(VO+2V)≤VIN ≤26V, IOUT=5mA
Quiescent Current
IQ
VIN= VOUT+5V, IOUT=500mA
Output Noise Voltage
eN
10Hz-100kHz, IOUT=5mA
Long Term Stability
1000Hrs
IOUT=500mA
Dropout Voltage
VD
IOUT=50mA
Short Circuit Current
ISC
0.6
Peak Line Transient Voltage
TIN
tF≤100ms, RL=100Ω
60
Reverse DC Input Voltage
VRIN
VOUT ≥-0.6V, RL=100Ω
-15
Reverse Transient Input Voltage
VTRRI
tF<1ms, RL=100Ω
-50
UNISONIC TECHNOLOGIES CO., LTD
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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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LM2937

LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Cont.)
For LM2937-5.0V
PARAMETER
Output Voltage
Line Regulation
Load Regulation
SYMBOL
VOUT
△VOUT
△VOUT
Quiescent Current
IQ
Output Noise Voltage
Long Term Stability
eN
Dropout Voltage
TEST CONDITIONS
5mA≤IOUT≤500mA
VOUT+2V≤VIN≤26V, IOUT=5mA
5mA≤IOUT≤500mA
(VOUT+2V)≤VIN ≤26V, IOUT=5mA
VIN= VOUT+5V, IOUT=500mA
10Hz-100kHz, IOUT=5mA
1000Hrs
IOUT=500mA
IOUT=50mA
TEST CONDITIONS
VD
tF≤100ms, RL=100Ω
VOUT ≥-0.6V, RL=100Ω
tF<1ms, RL=100Ω
For LM2937-8.0V
PARAMETER
Output Voltage
Line Regulation
Load Regulation
SYMBOL
VOUT
△VOUT
△VOUT
Quiescent Current
IQ
Output Noise Voltage
Long Term Stability
eN
Dropout Voltage
VD
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
ISC
TIN
VRIN
VTRRI
SYMBOL
VOUT
△VOUT
△VOUT
Quiescent Current
IQ
Output Noise Voltage
Long Term Stability
eN
Dropout Voltage
VD
Short Circuit Current
Peak Line Transient Voltage
Reverse DC Input Voltage
Reverse Transient Input Voltage
ISC
TIN
VRIN
VTRRI
TEST CONDITIONS
5mA≤IOUT≤500mA
VOUT+2V≤VIN≤26V, IOUT=5mA
5mA≤IOUT≤500mA
(VOUT+2V)≤VIN ≤26V,IOUT=5mA
VIN= Vo+5V, IOUT=500mA
10Hz-100kHz, IOUT=5mA
1000Hrs
IOUT=500mA
IOUT=50mA
tF≤100ms, RL=100Ω
VOUT ≥-0.6V, RL=100Ω
tF<1ms, RL=100Ω
TEST CONDITIONS
5mA≤IOUT≤500mA
VOUT+2V≤VIN≤26V, IOUT=5mA
5mA≤IOUT≤500mA
(VOUT+2V)≤VIN ≤26V,IOUT=5mA
VIN= VOUT+5V, IOUT=500mA
10Hz-100kHz, IOUT=5mA
1000Hrs
IOUT=500mA
IOUT=50mA
tF≤100ms ,RL=100Ω
VOUT≥-0.6V ,RL=100Ω
tF<1ms ,RL=100Ω
UNISONIC TECHNOLOGIES CO., LTD
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MIN
4.85
MIN
0.6
60
-15
-50
MIN
7.76
0.6
60
-15
-50
MIN
9.70
0.6
60
-15
-50
TYP
5.00
15
5
2
10
150
20
0.5
110
TYP
1.0
75
-30
-75
MAX
5.15
50
50
10
20
TYP
8.00
24
8
2
10
240
32
0.5
110
1.0
75
-30
-75
MAX
8.24
80
80
10
20
TYP
10.00
30
10
2
10
300
40
0.5
110
1.0
75
-30
-75
MAX
10.30
100
100
10
20
1.0
250
MAX
1.0
250
1.0
250
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
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LM2937

LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Cont.)
For LM2937-12.0V
PARAMETER
Output Voltage
Line Regulation
Load Regulation
SYMBOL
VOUT
△VOUT
△VOUT
Quiescent Current
IQ
Output Noise Voltage
Long Term Stability
eN
Dropout Voltage
VD
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
ISC
TIN
VRIN
VTRRI
SYMBOL
VOUT
△VOUT
△VOUT
Quiescent Current
IQ
Output Noise Voltage
Long Term Stability
eN
Dropout Voltage
VD
Short Circuit Current
Peak Line Transient Voltage
Reverse DC Input Voltage
Reverse Transient Input Voltage

ISC
TIN
VRIN
VTRRI
TEST CONDITIONS
MIN
5mA≤IOUT≤500mA
11.64
VOUT+2V≤VIN≤26V, IOUT=5mA
5mA≤IOUT≤500mA
(VOUT+2V)≤VIN ≤26V,IOUT=5mA
VIN= VOUT+5V, IOUT=500mA
10Hz-100kHz, IOUT=5mA
1000Hrs
IOUT=500mA
IOUT=50mA
0.6
tF≤100ms, RL=100Ω
60
VOUT≥-0.6V, RL=100Ω
-15
tF<1ms, RL=100Ω
-50
TYP
12.00
36
12
2
10
360
44
0.5
110
1.0
75
-30
-75
MAX
12.36
120
120
10
20
TEST CONDITIONS
MIN
5mA≤IOUT≤500mA
14.55
VOUT+2V≤VIN≤26V, IOUT=5mA
5mA≤IOUT≤500mA
(VOUT+2V)≤VIN ≤26V,IOUT=5mA
VIN= VOUT+5V, IOUT=500mA
10Hz-100kHz, IOUT=5mA
1000Hrs
IOUT=500mA
IOUT=50mA
0.6
tF≤100ms, RL=100Ω
60
VOUT≥-0.6V, RL=100Ω
-15
tF<1ms, RL=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
TYP
MAX
0.8
50
100
1.0
250
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
ON/OFF CONTROL (For 5 pins only)
PARAMETER
ON/OFF Threshold Voltage ON
ON/OFF Threshold Voltage OFF
ON/OFF Threshold Current
SYMBOL
VON
VOFF
ION/OFF
TEST CONDITIONS
IOUT≦0.5A
IOUT≦0.5A
VON/OFF=2.0V, IOUT=0.5A
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
MIN
2.0
UNIT
V
V
μA
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QW-R102-012.J
LM2937

TYPICAL APPLICATION

ON/OFF CONTROL APPLICATION
LINEAR INTEGRATED CIRCUIT
* Required if the regulator is located more than 3 inches from the power supply filter capacitors.
**Required for stability. COUT 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.
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www.unisonic.com.tw
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LM2937
TYPICAL CHARACTERISTICS
Dropout Voltage vs Output Current
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.7
0.5
0.1
0
0.1
0
-40
5.08
100
300
400
200
Output Current (mA)
500
Output Voltage vs Temperature
0.25A
0.4
0.3
0.2
0
0.5A
0.6
0.2
5.10
20
0.05A
0
80
40
Temperature (℃)
Quiescent Current (mA)
5.04
5.02
5.00
4.98
4.96
4.94
Quiescent Current vs Temperature
15
10
500mA
250mA
5
5mA
4.92
4.90
-40
100
0
80
40
Temperature (℃)
0
-40
120
Quiescent Current (mA)
60
0.5A
40
30
0.25A
20
0.05A
5
25
10 15
20
Input Voltage (V)
30
35
UNISONIC TECHNOLOGIES CO., LTD
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80
40
Temperature (℃)
120
10
70
50
0
Quiescent Current vs Input Voltage
Quiescent Current vs Input Voltage
VOUT=5V
90 Ta=25℃
80
10
0
0
120
RL=100Ω
5.06
Output Voltage (V)
Dropout Voltage vs Temperature
0.9
Dropout Voltage (V)
Dropout Voltage ( V)
1.0
TJ=25℃
0.8
Quiescent Current (mA)

LINEAR INTEGRATED CIRCUIT
VIN=14V
9 VOUT=5V
TJ=25℃
8
7
6
5
4
3
2
1
0
0
100
300
400
200
Output Current (mA)
500
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LM2937
TYPICAL CHARACTERISTICS(Cont.)
IOUT=50mA
VOUT=5 V
Ta=25℃
20
Output Voltage
Deviation (mV)
Output Voltage
Deviation (mV)
Load Transient Response
Line Transient Response
40
0
50
0
-50
Load
Current (A)
Input Voltage
Change (V)
-20
3V
0V
-10
0
10
20 30
Time (μs)
40
50
0
-1
4.0
60
50
3
2
Time (μs)
1
4
5
6
5.0
6.0
Low Voltage Behavior
IOUT=500mA
VOUT=5 V
TJ=25℃
5.0
VIN=10V
VOUT=5 V
70 COUT=10μF
IOUT=50mA
Output Voltage (V)
Ripple Rejection (dB)
400
0
60
Ripple Rejection
3.0
2.0
1.0
40
0
10
14
12
1K
10K
100K
Frequency (Hz)
100
0
1M
Low Voltage Behavior
18
IOUT=500mA
TJ=25℃
15
10
8
VOUT=8 V
6
4
1.0
2.0
4.0
3.0
Input Voltage (V)
Low Voltage Behavior
IOUT=500mA
TJ=25℃
VOUT=15 V
12
VOUT=12 V
9
6
3
2
0
0
Output Voltage (V)
VOUT=10V
Output Voltage (V)

LINEAR INTEGRATED CIRCUIT
2
4
6
10
8
Input Voltage (V)
12
14
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
0
0
3
12
6
9
Input Voltage (V)
15
18
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LM2937
TYPICAL CHARACTERISTICS(Cont.)
Output at Voltage Extremes
RL=100Ω
Output Voltage (V)
RL=100Ω
VOUT=10V
10
8
16
VOUT=8V
6
4
VOUT=5V
2
12
VOUT=12V
8
4
-20
-10
0
20
10
Input Voltage (V)
30
-4
-30
40
VIN=14V
VOUT=5 V
COUT=10μF
IOUT=25mA
10
1.0
0.1
0.01
100
1K
10K
100K
1M
Frequency (Hz)
100
Equivalent Series Resistance (Ω)
Output Impedance (Ω)
Output Impedance
10
VOUT=15V
0
0
-2
-30
Output at Voltage Extremes
20
Output Voltage (V)
12
-20
-10
0
20
10
Input Voltage (V)
30
40
Output Capacitor ESR
VOUT=5V
COUT=10μF
10
1
STABLE
REGION
0.1
0.01
0
100
400
200
300
Output Current (mA)
500
Peak Output Current
1.5
VIN=14V
Output Current (A)

LINEAR INTEGRATED CIRCUIT
1.0
0.5
0
-40
0
40
80
Temperature (℃)
120
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
9 of 10
QW-R102-012.J
LM2937
LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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