Rev. 10/30/00
SPX2937
500mA Low Dropout Voltage Regulators
(PRELIMINARY INFORMATION)
FEATURES
APPLICATIONS
Output Current 500mA at 15V, 12V, 10V, 8V, 5V, 3.3V and 2.5V
Battery Powered Systems
Internal Short Circuit Current Limit
Cordless Telephones
Dropout Voltage 0.5V at 500mA Output
Automotive Electronics
Extremely Tight Load and Line Regulation
Portable/ Palm Top / Notebook Computers
Very Low Temperature Coefficient
Portable Consumer Equipment
Mirror Image Insertion Protection
Portable Instrumentation
Direct Replacement For LM2937 Socket
SMPS Post-Regulator
Voltage Reference
PRODUCT DESCRIPTION
The SPX2937 is a low power positive voltage regulator. The SPX2937 offers 500mA output current with a dropout voltage of only
0.5V and over temperature dropout is up to 1V. The quiescent current is 10mA at differential output of 5V and output current of
500mA. A higher quiescent current can exist when the device is in dropout mode (V
IN
- V
OUT
3V )
The regulator will automatically shut down to protect both the internal circuits and the load. This device also features short circuit and
thermal overload protection.
The SPX2937 is offered in a 3-pin TO-220 package compatible with other 5 volt and 3.3 volt regulators, TO-263 and SOT-223. This
device offers a variety of output voltages 15V, 12V, 10V, 8V, 5V, 3.3V and 2.5V. SPX2937 is a direct replacement to LM2937.
Top View
SPX2937
1
3
2
SOT-223 (M3)
Top View
TO-263-3 (T)
1
SPX2937
2
3
Front View
TO-220-3 (U)
SPX2937
1
2
3
V
IN
GND V
OUT
V
OUT
GND V
IN
V
OUT
GND V
IN
PIN CONNECTIONS
Rev. 10/30/00
SPX2937
ABSOLUTE MAXIMUM RATINGS
Power Dissipation..........................................Internally Limited
Input Supply Voltage ................................................... +20V
Lead Temp. (Soldering, 10 Seconds) .............................. 260C
Feedback Input Voltage ..................................-1.5V to +20V
Storage Temperature Range ......................... -65C to +150C
Shutdown Input Voltage..................................-0.3V to +20V
Operating Junction Temperature Range ........ -40C to +125C
Error Comparator Output ................................-0.3V to +20V
ESD Rating ............................................................2KV Min
ELECTRICAL CHARACTERISTICS
at V
IN
= V
O
+ 5V, I
O
= 500mA, C
O
= 10
F, unless otherwise specified. Limits in
Boldface type apply over the entire operating temperature range. All other specifications are T
A
= 25
C.
PARAMETER CONDITIONS
SPX2937-2.5
Min Typ Max
SPX2937-3.3
Min Typ Max
SPX2937-5.0
Min Typ Max
SPX2937-8.0
Min Typ Max
UNITS
Output Voltage
5mA
I
O
0.75A
2.42
2.38
2.5 2.56
2.62
3.20
3.14
3.3 3.40
3.46
4.85
4.75
5.0 5.15
5.25
7.76
7.60
8.0 8.24
8.40
V
Line Regulation
V
O
+2V
V
IN
20V
I
O
=5mA
7.5 25
9.9 33
15 50
24 80
mV
Load Regulation
50mA
I
O
500mA
2.5 25
3.3 33
5 50
8 80
mV
Dropout Voltage
I
L
= 50 mA
I
L
= 500mA
110
0.5
250
1.0
110
0.5
250
1.0
110
0.5
250
1.0
110
0.5
250
1.0
mV
V
Quiescent
Current
V
O
+ 2V
V
IN
20V
I
O
= 5mA
V
IN
=V
O
+5V
I
O
=500mA
2
10
10
20
2
10
10
20
2
10
10
20
2
10
10
20
mA
mA
Output Noise
Voltage
10Hz - 100kHz
I
O
= 5mA
75 99 150
240
V
RMS
Ripple Rejection
F
O
= 120Hz, 1V
RMS
I
O
= 500mA
60
54
72 60
54
72 60
54
72 60
54
72 dB
Long Term
Stability
10
13.2 20 32
mV/
1000Hr
Short Circuit
Current
0.6
1.0
0.6
1.0 1.0
0.60
1.0
0.60
A
Maximum Line
Transient
R
O
= 100
T
100ms
60
75 60
75 60
75 60
75 V
Reverse Polarity
DC Input
Voltage
R
O
= 100
-15
-30
-15
-30 -15 -30 -15
-30 V
Reverse Polarity
Transient Input
Voltage
R
O
= 100
T
100ms
-50
-75 -50
-75 -50
-75 -50
-75 V
Rev. 10/30/00
SPX2937
ELECTRICAL CHARACTERISTICS
at V
IN
= V
O
+ 5V, I
O
= 500mA, C
O
= 10
F, unless otherwise specified. Limits in
Boldface type apply over the entire operating temperature range. All other specifications are T
A
= 25
C.
PARAMETER CONDITIONS
SPX2937-10
Min Typ Max
SPX2937-12
Min Typ Max
SPX2937-15
Min Typ Max
UNITS
Output Voltage
5mA
I
O
500mA
9.70
9.50
10.0 10.3
10.5
11.64
11.40
12.0 12.36
12.60
14.55
14.25
15.0 15.45
15.75
V
Line Regulation
V
O
+2V
V
IN
20V
I
O
=5mA
30
100 36 120
45 150
mV
Load Regulation
5mA
I
O
500mA
10
100 12 120
15 150
mV
Dropout Voltage
I
L
= 50 mA
I
L
= 500mA
0.5
250
1.0
110
0.5
250
1.0
110
0.5
250
1.0
mV
V
Quiescent Current
V
O
+ 2V
V
IN
20V
I
O
= 5mA
V
IN
=V
O
+5V
I
O
=500mA
2
10
10
20
2
10
10
20
2
10
10
20
mA
mA
Output Noise
Voltage
10Hz- 100kHz
I
O
= 5mA
300 360
450
V
RMS
Long Term
Stability
51
45
63 44 56 mV/
1000Hr
Short Circuit
Current
1.0
0.6
1.0 0.6
1.0 0.6
A
Maximum Line
Transient
R
O
= 100
T
100ms
60
75 60
75 60
75
V
Reverse Polarity
DC Input Voltage
R
O
= 100
-15
-15
-30
-30
-15
-15
-30
-30
-15
-15
-30
-30
V
Reverse Polarity
Transient Input
Voltage
R
O
= 100
T
100ms
-50
-75 -50
-75 -50
-75
V
APPLICATION HINTS
EXTERNAL CAPACITORS
The stability of the SPX2937 requires a 10
F or greater capacitor between output and ground. Oscillation could occur without this capacitor. Most
types of tantalum or aluminum electrolytic works fine here. For operations below -25
C solid tantalum is recommended since the many aluminum
types have electrolytes that freeze at about -30
C. The ESR of about 5 or less and resonant frequency above 500 kHz are the most important
parameters in the value of the capacitor. The capacitor value may be increased without limit.
At lower values of output current, less output capacitance is required for stability. For the currents below 10mA the value of the capacitor can be
reduced to 22
F and 0.15F for 1mA.
Rev. 10/30/00
SPX2937
ORDERING INFORMATION
Ordering No.
Output Voltages
Packages
SPX2937U3-2.5
2.5V
3 Lead TO-220
SPX2937U3-3.3
3.3V
3 Lead TO-220
SPX2937U3-5.0
5.0V
3 Lead TO-220
SPX2937U3-8.0
8.0V
3 Lead TO-220
SPX2937U3-10
10.0V
3 Lead TO-220
SPX2937U3-12
12.0V
3 Lead TO-220
SPX2937U3-15
15.0V
3 Lead TO-220
SPX2937T3-2.5
2.5V
3 Lead TO-263
SPX2937T3-3.3
3.3V
3 Lead TO-263
SPX2937T3-5.0
5.0V
3 Lead TO-263
SPX2937T3-8.0
8.0V
3 Lead TO-263
SPX2937T3-10
10.0V
3 Lead TO-263
SPX2937T3-12
12.0V
3 Lead TO-263
SPX2937T3-15
15.0V
3 Lead TO-263
SPX2937M3-2.5
2.5V
3 Lead SOT-223
SPX2937M3-3.3
3.3V
3 Lead SOT-223
SPX2937M3-5.0
5.0V
3 Lead SOT-223
SPX2937M3-8.0
8.0V
3 Lead SOT-223
SPX2937M3-10
10.0V
3 Lead SOT-223
SPX2937M3-12
12.0V
3 Lead SOT-223
SPX2937M3-15
15.0V
3 Lead SOT-223
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation
Headquarters and Main Offices:
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 935-7600
FAX: (408) 934-7500
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described
hereing; neither does it convey any license under its patent rights nor the rights of others.
Corporation
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