spx2954am3-l-5-0-tr Exar Corporation, spx2954am3-l-5-0-tr Datasheet - Page 4

• Manufacturer Part Number: spx2954am3-l-5-0-tr
• Description: 250ma Low Dropout Voltage Regulator
• Manufacturer: Exar Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
Date: 12/9/05
Shutdown Threshold Voltage
1.8
1.6
1.4
1.2
1.0
0.8
0.6
-75
SPX2954 Block Diagram, 8 Lead 5V Version
-50 -25 0
TEMPERATURE (ºC)
Line Regulation
-10
30
25
20
15
10
10
-5
FROM
CMOS OR
TTL
25
5
0
5
0
~ ~
5
50
T
J
T
= 125 ºC
75 100 125 150
J
+
= 150 ºC
10
UNREGULATED DC
INPUT VOLTAGE (V)
SHUTDOWN
3
15
SPX2954, 250mA Low Dropout Voltage Regulator
Thermal Response
FEEDBACK
20
7
I
L
= 100µA
-2
-1
5
4
2
0
1
0
I
I
0
L
L
~ ~
= 1mA
= 100µA
60 mV
+
25
1.23V
+
REFERENCE
10
INPUT
_
+
_
+
30
8
ERROR
AMPLIFIER
ERROR DETECTION
COMPARATOR
20
4
TIME (µs)
1.25W
30
Ripple Rejection
OUTPUT
180kΩ
60kΩ
80
70
60
50
40
30
20
10
1
40
10
1
C
V
V
I
GROUND
I
I
L
L
5V TAP
IN
OUT
50
L
L
ERROR
SENSE
______
=50mA
= 100mA
= 1µF
10
= 50µA
= 6V
= 5V
2
6
5
4
2
Output Noise
FREQUENCY (Hz)
10
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
3
+
10
TO CMOS OR
TTL
2
© Copyright 2005 Sipex Corporation
1µF
.
.
10
C
C = 3.3µF
C
5V
L
330kΩ
L
BYP
4
FREQUENCY (Hz), C
= 220µF
= 0.1µF
10
10
3
5
10
6
BYP
10
I
L
=0.1uF
= 100mA
4
C
L
= 1µF
10
5