2.3
20
50
0
FEEDBACK CURRENT (µA)
MINIMUM OPERATING VOLTAGE (V)
10
BIAS CURRENT (nA)
PIN 7 DRIVEN BY EXTERNAL
SOURCE (REGULATOR RUN
OPEN LOOP)
2.1
-50
-100
-150
-200
-250
TA=1 25ºC
0
-10
1.9
T
A
= 25ºC
-20
T
A
= 55ºC
1.7
-75
-50 -25
0
25 50
75
100 125
150
TEMPERATURE
-30
-75 -50
-25
0
25
50 75 100
125
150
TEMPEATURE (ºC)
-2.0
-1.5 -1.0 -0.5
0
0.5
1.0
FEEDBACK VOLTAGE (V)
LP2951 Minimum Operating Voltage
LP2951 Feedback Bias Current
LP2951 Feedback Pin Current
250
80
60
40
LOAD OUTPUT VOLTAGE
CURRENT CHANGE (mV)
7
6
SHUTDOWN OUTPUT
PINOUT VOLTAGE (V) VOLTAGE (V)
200
150
LOAD OUTPUT VOLTAGE
CURRENT CHANGE (mV)
C
L
= 1
µF
5
100
20
0
-20
-40
-60
~
~
C
L
= 10
µF
V
OUT
= 5V
4
3
2
1
0
2
0
C
L
= 10
µF
I
L
= 10mA
V
IN
= 8V
V
OUT
= 5V
50
0
-50
-100
~
~
C
L
= 1
µF
V
OUT
= 5V
100
µA
mA
100
100
0
1
2
TIME (ms)
µA
µA
100
3
4
5
-2
0
4
8
12
16
20
-100 0 100 200 300 400 500 600 700
TIME (us)
TIME (ms)
Load Transient Response
Load Transient Response
Enable Transient
120
400
TO-92 PACKAGE
0.25" LEADS SOLDERED
TO PC BOARD
Vout=5V
120
8-PIN
MOLDED
PIN 2 TO PIN 4 RESISTANCE (kΩ)
100
OUTPUT CURRENT (mA)
100
OUTPUT CURRENT (mA)
300
80
60
80
DIP SOLDERED
TO PC BOARD
T
JMAX
= 125º C
V
OUT
= 5V
60
40
20
0
0
T
A
= 85 ºC
T
JMAX
= 125 ºC
200
T
A
= 25ºC
T
A
=25 ºC
40
20
T
A
= 50ºC
100
T
A
= 85ºC
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
0
-75
-50 -25
0
25 50
75
100 125
150
TEMPERATURE (ºC)
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
LP2950 Maxium Rated Output
Rev G
LP2951 Divider Resistance
LP2950 Maxium Rated Output Current
© 2008 Exar Corporation
LP2950-5 Low Dropout Linear Regulators
6
EXAR [ EXAR CORPORATION ]
