spx2950acn-l-5-0-tr Exar Corporation, spx2950acn-l-5-0-tr Datasheet - Page 12

• Manufacturer Part Number: spx2950acn-l-5-0-tr
• Description: Spx2951 -150ma Low Dropout Voltage Regulator
• Manufacturer: Exar Corporation

TYPICAL APPLICATIONS: (Continued)
Figure 8. Open Circuit Detector for 4mA to 20mA
Current Loop
Figure 10. Schematic Diagram
DATE: 12/01/04
4
1N4001
0.1µF
Q42
Q40
20mA
30kΩ
R30
4
Q41
Q6
50kΩ
20kΩ
IN
R2
R1
ERROR
10
SPX2951
Q3
Q1
GND
18kΩ
+V
R11
4
IN
8
Q38
50kΩ
MIN VOLTAGE = 4V
R3
20pF
180kΩ
C1
4
V
OUT
FB
Q39
R5
1N457
Q2
Q37
Q4
Q13
7
1
140kΩ
2
R26
60kΩ
R6
13kΩ
R4
Q12
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
Q36
Q5
2
360K
20.6kΩ
27.8kΩ
4.7mA
31.4kΩ
Q35
Ω
R11
R9
R8
+5V
R25
2.8kΩ
Q7
Q11
OUTPUT
Q15A
R10
150
kΩ
Q34
5
Q8
12
Q9
110kΩ
R12
Q20
Figure 9. 300mA Regulator with 0.75V
GND
Q15B
2
UNREGULATED INPUT
1
Q18
R13
100
kΩ
Q16
R22
150kΩ
40pF
8
C2
6
Q17
V
IN
TAP
R14
350kΩ
FB
1
7
2
SPX2951
Q19
Q30
DENOTES CONNECTION ON
LP2950 ONLY
Q21
GND
FEEDBACK
Q31
Q14
SENSE
4
V
Q29
OUT
12kΩ
R17
1
2
Q28
6
R24
50kΩ
Q25
Q22
©Copyright 2004 Sipex Corporation
R16
30kΩ
R13
100kΩ
27kΩ
R18
20kΩ
3
R23
60kΩ
R21
330kΩ
3
8Ω
+
4.7µF
R17
10Ω
Q26
3
Q23
SHDN
LOAD
50mA
TO
300 mA
24
3
5V
OUTPUT
R27
R28
Q24
SENSE
2N5432
VTAP
OUT
(2)