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PDF LP2950 Data sheet ( Hoja de datos )
| Número de pieza | LP2950 | |
| Descripción | (LP2950 / LP2951) 100 mA Low Dropout Voltage Regulators | |
| Fabricantes | Sipex Corporation | |
| Logotipo |  |
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 1. PDF - Adjustable Voltage Regulator  Hay una vista previa y un enlace de descarga de LP2950 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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LP2950/LP2951
100mA Low Dropout Voltage Regulators
FEATURES
• 5.0V and 3.3V Versions at 100mA Output
• Very Low Quiescent Current
• Low Dropout Voltage: 380mV at 100mA
• Extremely Tight Load and Line Regulation
• Very Low Temperature Coefficient
• Current & Thermal Limiting
• Need Only 1 µF for Stability
• Offered in TO-92 (LP2950) & SOIC (LP2951)
• Direct Replacement For LP2950/LP2951
LP2951 versions only
• Error Flag Warns of Output Dropout
• Logic-Controlled Electronic Shutdown
• Output Programmable From 1.24 to 29V
APPLICATIONS
• Battery Powered Systems
• Cordless Telephones
• Radio Control Systems
• Portable/Palm Top/Notebook Computers
• Portable Consumer Equipment
• Portable Instrumentation
• Avionics
• SMPS Post-Regulator
• Voltage Reference
• Automotive Electronics
Now Available in Lead Free Packaging
PRODUCT DESCRIPTION
DataShee
The LP2950 and LP2951 are low power voltage regulators. These devices are an excellent choice for use in battery-powered
applications such as cordless telephones, radio controlDsaytastSemhes,eta4nUd.cpoomrtable computers. The LP2950 and LP2951 feature low
quiescent current and low dropout voltage (typ. 50mV at light load and 380 mV at 100mA). This includes a tight initial tolerance
(0.5% typ.), extremely good load and line regulation (0.05% typ.), and very low output temperature coefficient (20 ppm/¡C typ.),
making the LP2950/LP2951 useful as a low-power voltage reference.
The error flag output feature is used as a power-on reset for warning of a low output voltage, due to a falling input voltage. The logic-
compatible shutdown feature enables the regulator to be switched ON and OFF. The LP2950 is offered in a 3-pin TO-92 package
compatible with other 5V, 3.3V regulators. The LP2951 is available in an 8-lead SOIC package.
Block diagram of LP2951
UNREGULATED DC
+
7
FEEDBACK
8
INPUT
1
OUTPUT
FROM
CMOS OR
TTL
3
SHUTDOWN
+
_
ERROR
AMPLIFIER
180kΩ
60 mV
+
+
60kΩ
_ ERROR DETECTION
+ 1.23V
COMPARATOR
REFERENCE
2
SENSE
6
5V TAP
5
______
ERROR
4
GROUND
5V @ 100mA
MAX
330kΩ
+
1µF
.
.
TO CMOS OR
TTL
DataSheet4U.com
Rev. 8/10/01
DataSheet4 U .com
LP2950/51 100mA Low Dropout Voltage Regulators
1
©Copyright 2001 Sipex Corporation
1 page  
www.DataSheet4U.com
LP2950/LP2951
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
600
IL = 100mA
500
400
300
~
~
100
50 IL = 100µA
0
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (ºC)
Drop-Out Voltage
500
400
300
200
TJ = 25ºC
100
0
100µA
1mA 10mA
OUTPUT CURRENT
Drop-Out Voltage
170
160
150
140
130
120
110
100mA
110
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (ºC)
Short Circuit Current
8
V OUT = 5V
6
et4U.com
4
HYSTERESIS
2
0
PULLUP RESISTOR TO
-2 SEPARATE 5V SUPPLY
0 12 3 4
INPUT VOLTAGE (V)
Error Comparator Output
5
2.5
TA = 125ºC
2.0
1.5
TA = 25ºC
1.0
DataSheet4U.coTmA = -55ºC
0.5
100
mV
50
mV
0
-50
mV ~~
8V
6V
CL = 1µF
IL = 1mA
V OUT = 5V
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)
LP2951 Comparator Sink Current
4V
0 200 400
TIME(µs)
Line Transient Response
600
800
DataShee
10
IO = 100µA
5
2 IO = 1mA
1 IO = 100mA
0.5
0.2 VOUT = 5V
CL = 1µF
0.1
0.05
0.02
0.01
10 100 1K 10K 100K
FREQUENCY (Hz)
Output Impedance
1M
90
80
70
IL = 0
60
50
40
CL = 1µF
30 VIN = 6V
V OUT = 5V
20
IL = 100µA
10 1 10 2 10 3 10 4 10 5
FREQUENCY (Hz)
10 6
Ripple Rejection
90
80
70 IL = 1mA
60
CL= 1µF
VIN = 6V
VOUT = 5V
50
40
30
20
10 1
IL = 10mA
10 2 10 3 10 4
FREQUENCY (Hz)
Ripple Rejection
10 5
10 6
DataSheRete4vU. 8.c/1o0m/01
DataSheet4 U .com
LP2950/51 100mA Low Dropout Voltage Regulators
5
©Copyright 2001 Sipex Corporation
5 Page 
www.DataSheet4U.com
TYPICAL APPLICATIONS (continued)
LP2950/LP2951
+V IN
AUX SHUTDOW
INPUT
ON
OFF
3 SD
8
+V IN
_______ 5
ERROR
LP2951
1
V OUT
10K Ω.
5 DEGR.EE SHUTDOWN FLAG
TEMP
SENSOR
+
AS35
-
GND
4
FB
7
8.2K Ω
EXTERNAL CIRCUIT
PROTECTED FROM
OVER TEMPERATURE
(V+ GOES OFF WHEN
TEMP > 125)
OR
RELAY
Figure 7. System Over Temperature Protection
et4U.com
4 20mA
1N4001
0.1µF
8
+V IN
1
V OUT
LP2951
7
FB
GND
4
1N457
MIN VOLTAGE = 4V
DataSheet4U.com
+5V
4.7mA
UNREGULATED INPUT
OUTPUT
2
360K Ω
8
IN
1
V OUT
LP2951
6
V TAP
FB
7
SENSE
GND
4
2
330KΩ
27KΩ
+ 4.7µF
2N5432
(2)
5V
OUTPUT
LOAD
50mA
TO
300 mA
DataShee
Figure 8. Open Circuit Detector for 4mA to 20mA Current
Loop
Figure 9. 300mA Regulator with 0.75V
DataSheReetv4.U8./c1o0m/01
DataSheet4 U .com
LP2950/51 100mA Low Dropout Voltage Regulators
11
©Copyright 2001 Sipex Corporation
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LP2950.PDF ] | |
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