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PDF AMS2942 Data sheet ( Hoja de datos )
| Número de pieza | AMS2942 | |
| Descripción | HIGH VOLTAGE LOW DROPOUT REGULATOR | |
| Fabricantes | Advanced Monolithic Systems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AMS2942 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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Advanced
Monolithic
Systems
AMS2942
HIGH VOLTAGE LOW DROPOUT REGULATOR
FEATURES
• Adjustable from 1.23V to 42V
• High Accuracy Output Voltage
• Extremely Low Quiescent Current
• Low Dropout Voltage
• Tight Load and Line Regulation
• Low Temperature Coefficient
• Current and Thermal Protection
• Unregulated DC Positive Transients 60V
• Error Flag Warning of Voltage Output Dropout
• Logic Controlled Electronic Shutdown
APPLICATIONS
• Telephone Systems
• High Voltage Power Supply
• Cordless Telephones
• Laboratory Instrumentation
• Radio Control Systems
• Automotive Electronics
• Avionics
GENERAL DESCRIPTION
The AMS2942 are micropower voltage regulators ideally suited for use with high voltage powered systems. This device
feature very low quiescent current (typ.130µA), and very low dropout voltage (typ.45mV at light loads and 380mV at
100mA). The quiescent current increases only slightly in dropout. The AMS2942 has positive transient protection up to 60V
and can survive unregulated input transient up to 20V below ground.
AMS2942 is designed with a tight initial voltage reference tolerance, excellent load and line regulation (typ. 0.05%), and a
very low output voltage temperature coefficient, making these devices useful as a low-power voltage regulator in telephone
applications, using the telephone line as a power source.
The AMS2942 is available in a special 8-pin plastic SOIC in which pin 2 and 3 are fused together with the package paddle
serving also as heat sink. An error flag output warns of a low output voltage, often due to failing voltage on input line. A
logic-compatible shutdown input is available, which enables the regulator to be switched on and off. The output voltage can
be programmed from 1.23V to 42V with an external pair of resistors.
ORDERING INFORMATION
PACKAGE TYPE
8 LEAD SOIC
AMS2942AS
AMS2942BS
OPERATING
TEMP. RANGE
IND
IND
PIN CONNECTION
8L SOIC
OUTPUT 1
GROUND 2
GROUND 3
ON/OFF 4
8 INPUT
7 FEEDBACK
6 N/C
5 ERROR
Top View
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Load Transient Response
250
200
150
100
50
0
-50
-100
~~
100
mA
10µ0A
CL= 1 µF
01 2 3
TIME (ms)
4
5
Load Transient Response
80
60
40
20
0
-20
-40
-60
~~
100
mA
10µ0A
CL= 10 µF
0 4 8 12 16
TIME (ms)
20
AMS2942
Enable Transient
7
6 CL= 1 µF
5
4 IL= 10 mA
3 VIN = 8V
2 CL= 10 µF
1
0
2 ~~
0
-2
-100 0 100 200 300 400 500 600 700
TIME (µs)
Output Impedance
10
5 IO= 100µA
2
1 IO= 1 mA
0.5
IO= 100mA
0.2
0.1
0.05
VOUT = 5V
CL= 1 µF
0.02
0.01
10
100 1K 10K 100K 1M
FREQUENCY (Hz)
Ripple Rejection
90
80
70
60 IL= 0
50
40
30
20
101
CL= 1 µF
VIN= 6V
VOUT = 5V
IL= 100µA
102 103 104 105
FREQUENCY (Hz)
106
Ripple Rejection
90
80
70 IL= 1mA
60
CL= 1 µF
VIN= VOUT+1V
50
40
30
20
101
IL= 10mA
102 103 104 105
FREQUENCY (Hz)
106
Error Comparator Output
9
8 VOUT= 5V
7
50k RESISTOR TO
6 EXTERNAL 5V SUPPLY
5
4 HYSTERESIS
3
50k
2 RESISTOR
1 TO VOUT
0
0 123456 7 8
INPUT VOLTAGE (V)
Error Comparator Sink Current
2.5
TA = 125°C
2.0
1.5
TA = 25°C
1.0
TA = -55°C
0.5
0.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
OUTPUT LOW VOLTAGE (V)
Line Transient Response
100
mV
50
mV
0
-50
mV
~~
8V
CL= 1µF
IL= 1mA
VOUT= 5V
6V
4V
0
200 400 600
TIME (µs)
800
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet AMS2942.PDF ] | |
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