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PDF LM2937 Data sheet ( Hoja de datos )
| Número de pieza | LM2937 | |
| Descripción | 500mA LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM2937 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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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 -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
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
1 of 10
QW-R102-012.J
1 page  
LM2937
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Cont.)
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
SYMBOL
VOUT
△VOUT
△VOUT
IQ
eN
VD
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= 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
MIN
11.64
0.6
60
-15
-50
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
VOUT
△VOUT
△VOUT
IQ
eN
VD
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= 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
MIN
14.55
0.6
60
-15
-50
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
MIN
2.0
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
TYP
50
MAX
12.36
120
120
10
20
1.0
250
UNIT
V
mV
mV
mA
mA
μVrms
mV
V
mV
A
V
V
V
MAX
15.45
150
150
10
20
1.0
250
UNIT
V
mV
mV
mA
mA
μVrms
mV
V
mV
A
V
V
V
MAX
0.8
100
UNIT
V
V
μA
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 10
QW-R102-012.J
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LM2937.PDF ] | |
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