AS2937M3-3.3 [SIPEX]
Fixed Positive LDO Regulator, 3.3V, 1V Dropout, BIPolar, PDSO4, SOT-223, 3 PIN;
| 型号： | AS2937M3-3.3 |
| 厂家： | 
SIPEX CORPORATION |
| 描述： | Fixed Positive LDO Regulator, 3.3V, 1V Dropout, BIPolar, PDSO4, SOT-223, 3 PIN 光电二极管 输出元件 调节器 |
| 文件： | 总3页 (文件大小：87K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AS2937
500mA Low Dropout Voltage Regulators
(PRELIMINARY INFORMATION)
FEATURES
APPLICATIONS
• Output Current 500mA at 15V,12V, 10V, 8V, 5V, 3.3V and 2.5V
• Internal Short Circuit Current Limit
• Dropout Voltage 0.5V at 500mA Output
• Extremely Tight Load and Line Regulation
• Very Low Temperature Coefficient
• Mirror Image Insertion Protection
• Battery Powered Systems
• Cordless Telephones
• Automotive Electronics
• Portable/ Palm Top / Notebook Computers
• Portable Consumer Equipment
• Portable Instrumentation
• SMPS Post-Regulator
• Direct Replacement For LM2937 Socket
• Voltage Reference
PRODUCT DESCRIPTION
The AS2937 is a low power positive voltage regulator. The AS2937 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 (VIN - VOUT≤ 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 AS2937 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. AS2937 is a direct replacement to LM2937.
ORDERING INFORMATION
TO-220
3-PIN
TO-263
3 PIN
SOT-223
3-PIN
OPERATING
TEMP. RANGE
-40 °C to +125°C
AS2937U-X
AS2937T-X
AS2937M3-X
X = Output Voltage (X = 2.5V, 3.3V, 5.0V, 8.0V, 10V, 12V or 15V
Consult factory for other fixed voltages.
PIN CONNECTIONS
TO-263-3 (T)
TO-220-3 (U)
AS2937
SOT-223 (M3)
AS2937
AS2937
1
2
3
1
3
2
1
2
3
VIN GND VOUT
Top View
VOUT GND VIN
Top View
VOUT
VIN
GND
Front View
Rev. 9/29/00
AS2937
ABSOLUTE MAXIMUM RATINGS
Power Dissipation..........................................Internally Limited
Lead Temp. (Soldering, 10 Seconds) .............................. 260°C
Storage Temperature Range ......................... -65°C to +150°C
Operating Junction Temperature Range ........ -40°C to +125°C
Input Supply Voltage ................................................... +20V
Feedback Input Voltage ..................................-1.5V to +20V
Shutdown Input Voltage..................................-0.3V to +20V
Error Comparator Output................................-0.3V to +20V
ESD Rating ............................................................2KV Min
ELECTRICAL CHARACTERISTICS at V = V + 5V, I = 500mA, C = 10 F, unless otherwise specified. Limits in
µ
O
O
Boldface type apply over the entire operating temperatuINre range. All Oother specifications are TA = 25°C.
PARAMETER CONDITIONS
AS2937-2.5
AS2937-3.3
AS2937-5.0
AS2937-8.0
UNITS
2.5V
3.3V
5V
8V
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Output Voltage
Line Regulation
Load Regulation
Dropout Voltage
Quiescent Current
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
24
8
8.24
V
5mA ≤IO ≤0.75A
8.40
80
7.5
2.5
9.9
3.3
15
5
mV
mV
25
33
50
VO+2V≤VIN≤ 20V
IO=5mA
25
33
50
80
50mA≤IO≤ 500mA
IL = 50 mA
IL = 500mA
110
0.5
2
110
0.5
2
110
0.5
2
110
0.5
2
mV
V
mA
250
1.0
250
1.0
250
1.0
250
1.0
10
10
10
10
VO + 2V ≤VIN≤20V
IO = 5mA
10
75
10
99
10
10
mA
20
20
20
20
V
IN=VO+5V
IO=500mA
Output Noise
Voltage
10Hz - 100kHz
150
240
µVRMS
IO = 5mA
Ripple Rejection
FO = 120Hz, 1VRMS
IO = 500mA
60
72
60
72
60
72
20
60
72
32
dB
54
54
54
54
Long Term Stability
10
1.0
75
13.2
1.0
75
mV/ 1000Hr
Short Circuit
Current
0.6
60
1.0
60
1.0
60
A
V
V
V
0.6
60
0.60
75
0.60
75
Maximum Line
RO = 100Ω
T ≤ 100ms
Transient
Reverse Polarity
DC Input Voltage
Reverse Polarity
Transient Input
Voltage
-15
-50
-30
-75
-15
-50
-30
-75
-15
-50
-30
-75
-15
-50
-30
-75
R
O = 100Ω
RO = 100Ω
T ≤ 100ms
Rev. 9/29/00
AS2937
ELECTRICAL CHARACTERISTICS at V = V + 5V, I = 500mA, C = 10 F, unless otherwise specified. Limits in
µ
O
O
Boldface type apply over the entire operating temperatuINre range. All Oother specifications are TA = 25°C.
PARAMETER
CONDITIONS
AS2937-10.0
AS2937-12.0
AS2937-15.0
UNITS
10V
12V
15V
Min
Typ
Max
Min
Typ
11.64 12.0
11.40
Max
Min
Typ
Max
Output Voltage
Line Regulation
9.70
10.0
10.3
10.5
100
12.36
12.60
120
14.55 15.0
15.45
15.75
150
V
5mA ≤IO ≤500mA
9.50
14.25
30
36
45
15
mV
mV
VO+2V≤VIN≤ 20V
IO=5mA
5mA≤IO≤ 500mA
Load Regulation
Dropout Voltage
Quiescent Current
10
100
12
120
150
IL = 50 mA
0.5
110
0.5
110
0.5
mV
V
250
1.0
250
1.0
250
1.0
IL = 500mA
VO + 2V ≤VIN≤20V
IO = 5mA
2
2
2
mA
10
20
10
20
10
20
VIN=VO+5V
IO=500mA
10
300
10
360
10
450
mA
µVRMS
Output Noise
Voltage
10Hz- 100kHz
IO = 5mA
Long Term
Stability
51
63
1.0
75
44
56
1.0
75
mV/ 1000Hr
45
Short Circuit
Current
1.0
A
V
V
V
0.6
0.6
0.6
Maximum Line
75
60
60
60
RO = 100Ω
T ≤ 100ms
RO = 100Ω
Transient
Reverse Polarity
DC Input Voltage
Reverse Polarity
Transient Input
Voltage
-15
-15
-50
-30
-30
-75
-15
-15
-50
-30
-30
-75
-15
-15
-50
-30
-30
-75
RO = 100Ω
T ≤ 100ms
APPLICATION HINTS
EXTERNAL CAPACITORS
The stability of the AS2937 requires a 10µF 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 5Ω 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 22µF and 0.15µF for 1mA.
Rev. 9/29/00
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