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PDF SPX2950 Data sheet ( Hoja de datos )
| Número de pieza | SPX2950 | |
| Descripción | 150mA Low Dropout Voltage Regulator | |
| Fabricantes | Sipex | |
| Logotipo |  |
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® SPX2950/SPX2951
150mA Low Dropout Voltage Regulator
FEATURES
■ 5.0V and 3.3V at 150mA Output
■ Accurate: 0.5% for SPX2950A/SPX2951A
■ Very Low Quiescent Current
■ Low Dropout Voltage: 300mV at 150mA
■ Extremely Tight Load and Line Regulation
■ Very Low Temperature Coefficient
■ Current & Thermal Limiting
■ Need Only 1µF for Stability
■ Offered in TO-92 (SPX2950) and SOIC
(SPX2951)
■ Direct Replacement for LP2950/LP2951
SPX2951 versions only
■ Error Flag Warns of Output Dropout
■ Logic-Controlled Electronic Shutdown
■ Output Programmable From 1.24 to 29V
8-Pin Surface Mount (S)
OUTPUT
SENSE
SHUTDOWN
GROUND
1
2
3
4
8 INPUT
7 FEEDBACK
6 5V or 3.3V Output
5 ERROR
VOUT
TO-92 (N)
1 23
GROUND
VIN
SPX2951 Top View
SPX2950 Bottom View
Now Available in Lead Free Packaging
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
DESCRIPTION
The SPX2950 and SPX2951 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 SPX2950 and SPX2951 feature low quiescent current and low dropout voltage (typ. 20mV
at 100µA and 300mV at 150mA). This includes a tight initial tolerance of (0.5% for SPX2950A/SPX2951A),
extremely good load and line regulation (0.05% typ.), and very low output temperature coefficient (20ppm/
°C typ.), making the SPX2950/SPX2951 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
voltage. The logic compatible shutdown feature enables the regulator to be switched ON and OFF. The
SPX2950 is offered in a 3-pin TO-92 package compatible with other 5.0V, 3.3V regulators. The SPX2951
is availiable in an 8-lead SOIC package.
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
330kΩ
+
1µF
.
.
TO CMOS OR
TTL
Block Diagram of SPX2951, 8 Lead 5V Version
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
1
©Copyright 2004 Sipex Corporation
1 page  
TYPICAL PREFORMANCE CHARACTERISTICS
500
IL = 150mA
400
300
200
~
~
40
20 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
240
230
220
210
200
190
180
100mA
170
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (ºC)
Short Circuit Current
8
V OUT = 5V
6
4
HYSTERESIS
2
0
PULLUP RESISTOR TO
-2 SEPARATE 5V SUPPLY
0 12 3 4
INPUT VOLTAGE (V)
Error Comparator Output
5
2.5 100
mV
2.0
TA = 125ºC
50
mV
0
1.5
1.0
TA = 25ºC
-50
mV ~~
CL = 1µF
IL = 1mA
V OUT = 5V
8V
TA = -55ºC
0.5 6V
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)
SPX2951 Comparator Sink Current
4V
0
200 400
TIME(µs)
Line Transient Response
600
800
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
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
5
©Copyright 2004 Sipex Corporation
5 Page 
TYPICAL APPLICATIONS: (Continued)
39kΩ
RESET
-
C4
+
39kΩ
82
5
+VIN
ERROR
SENSE
VOUT
1
SPX2951
3 SD
GND
4
FB
TAP
6
7
+VOUT=5V
+
1µF
1% 100kΩ
6V
LEAD-
ACID
BATTERY
1%
1%
1kΩ
1kΩ
R1 10kΩ
1% 20kΩ
- 100kΩ
C1
+
- 100kΩ
C2
+
- 100kΩ
C3
+
<5.8V**
<6.0V**
<6.2V**
* OPTIONAL LATCH OFF WHEN DROPOUT OCCURS.
ADJUST R3 FOR C2 SWITCHING WHEN VIN IA 6.0V
* OUTPUTS GO LOW WHEN VIN DROPS BELOW DESIGNATED THRESHOLDS
Figure 6. Regulator with State-of Charge Indicator
+V IN
AUX SHUTDOW
INPUT
ON
OFF
3 SD
8
+V IN
_______ 5
ERROR
SPX2951
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
DATE: 12/01/04
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
11
©Copyright 2004 Sipex Corporation
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SPX2950.PDF ] | |
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