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PDF SPX2954 Data sheet ( Hoja de datos )

Número de pieza SPX2954
Descripción 250 mA Low Drop Out Voltage Regulator
Fabricantes Sipexoration　
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No Preview Available ! SPX2954 Hoja de datos, Descripción, Manual

® SPX2954
250mA Low Dropout Voltage Regulator
FEATURES
■ 5.0V and 3.3V Versions at 250mA
Output
■ Accurate 0.5% for SPX2954A
■ Very Low Quiescent Current
■ Low Dropout: 310mV at 250mA
■ Extremely Tight Load and Line Regulation
■ Very Low Temperature Coefficient
■ Current and Thermal Limiting
■ Need only 1µF for Stability
■ Direct Replacement for LP2954
■ Offered in TO-92, TO-263, SOT-223, &
TO-220; also SOIC--8 Pin Versions Only
+V IN
100K
ERROR
OUTPUT
5 ______
ERROR
8
+V IN
1
V OUT
SPX2954
SHUTDOWN
INPUT
3
SD
GND
4
FB
7
1.23V
1.2 to 30V
+
R1 3.3µF
.01µF
VREF
R2
■ Error Flag Warns of Output Dropout
■ Logic-Controlled Electronic Shutdown
■ Programmable Output from 1.24V to 30V
DESCRIPTION
The SPX2954 and SPX2954A are low power voltage regulators. These devices are an excellent
choice for use in battery-powered applications such as cordless telephones, radio control
systems, and portable computers. The SPX2954 and SPX2954A feature low quiescent current
and low dropout voltage (typ. 20mV at 100µA and 310mV at 250mA). This includes a tight initial
tolerance (0.5% for SPX2954A), extremely good load and line regulation (0.05% typ.), and very
low output temperature coefficient (20 ppm/°C typ.), making the SPX2954/SPX2954A 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 SPX2954/SPX2954A is offered in 3-pin TO-92, TO-263, SOT-223
and TO-220 packages, and 8 pin SOIC package.
Note:: Tab is internally connected to GND on T0-263, SOT-223, and TO-220-3.
TO-263-3 Package (T) TO-263-5 Package (T8-5P) in Surface Mount (S)
OUTPUT
1
8 INPUT
SPX2954
1 23
VIN GND VOUT
Top View
SPX2954 SENSE
2
7
SPX2954
1 2SH3UT4DO5WN 1) INPU3T
6
2) OUTPUT
GND 3) GND4
5
4) SHUTDOWN
5) ERROTRop View
Top View
FEEDBACK
5V, 3.3V TAP
ERROR
TO-92 (N)
12 3
OUTPUT
GND
Bottom View
INPUT
SOT-223 Package (M3)
SPX2954
123
V GND V
IN OUT
Front View
Pin Connections
TO-220-3 Package (U) TO-220-5 Package (U5)
SPX2954
1 23
VIN GND VOUT
Front View
SPX2954
1 2 34 5
1) INPUT
2) OUTPUT
3) GND
4) SHUTDOWN
5) ERROR
Front View
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
1
© Copyright 2005 Sipex Corporation

1 page




SPX2954 pdf
TYPICAL PERFORMANCE CHARACTERISTICS
6
5
4
R L =50kΩ
3
R L =50kΩ
2
1
0
0 123 45
INPUT VOLTAGE (VOLTS)
Dropout Characteristics
6
250
225
200
RL = 50kΩ
175
150
125
100 RL =
75
50
25
0
0
1 2 3 4 5 67 8
INPUT VOLTAGE (VOLTS)
9 10
Input Current
10
1
0.1
0.01
0.1 1 10
LOAD CURRENT (mA)
Quiescent Current
100
320
280
240
200 IL= 1mA
160
IL= 0
120
80
40
0
0 1 2 34 56 7 8
INPUT VOLTAGE (VOLTS)
Ground Current
160
150
140
130 RL=50 Ω
120 VOUT = 5V
110
100
90
80
70
60
50
40
30
20
10
0
0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (VOLTS)
Input Current
6
5
V IN = 6V
IL = 100mA
4
3
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (ºC)
Ground Current
8
7
6
IL=100mA
5
4
3
2
1
0
0 12345678
INPUT VOLTAGE
Ground Current
190
170
V IN=6V
IL =100uA
150
130
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (ºC)
Quiescent Current
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
5
© Copyright 2005 Sipex Corporation

5 Page





SPX2954 arduino
APPLICATIONS HINTS
+V IN
AUX SHUTDOW
INPUT
ON
OFF
3 SD
8
+V IN _______ 5
ERROR
SPX2954
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)
Figure 6. System Over Temperature Protection
OR
RELAY
4 20mA
1N4001
0.1µF
+5V
4.7mA
8
+V IN
1
V OUT
SPX2954
7
FB
OUTPUT
2
GND
4
1N457
MIN VOLTAGE = 4V
360K Ω
Figure 7. Open Circuit Detector for 4mA to 20mA
Current Loop
UNREGULATED INPUT
8
IN
1
V OUT
SPX2954
6
V TAP
FB
7
SENSE
GND
4
2
330kΩ
27kΩ
+ 4.7µF
2N5432
(2)
5V
OUTPUT
LOAD
50mA
TO
300 mA
Figure 8. 300mA Regulator with 0.75V
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
11
© Copyright 2005 Sipex Corporation

11 Page







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