Datasheet

8
LT1021
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
Shunt Characteristics LT1021-10
Shunt Mode Current Limit
LT1021-10
Thermal Regulation LT1021-10
OUTPUT TO GROUND VOLTAGE (V)
0
0
CURRENT INTO OUTPUT (mA)
0.2
0.6
0.8
1.0
8
1.8
1021 G28
0.4
42 6 10 12
1.2
1.4
1.6
T
J
= – 55°C
T
J
= 25°C
INPUT PIN OPEN
T
J
= 125°C
OUTPUT VOLTAGE (V)
0
0
CURRENT INTO OUTPUT (mA)
10
30
40
50
4
8
10 18
1021 G29
20
26
12
14
16
60
INPUT PIN OPEN
TIME (ms)
OUTPUT CHANGE (mV)
–1.0
–0.5
0
140
1021 G30
–1.5
20
60
100
0
40
80
120
LOAD
REGULATION
THERMAL
REGULATION*
I
LOAD
= 10mA
*INDEPENDENT OF TEMPERATURE COEFFICIENT
V
IN
= 30V
∆POWER = 200mW
Load Transient Response
LT1021-10, C
LOAD
= 0
TIME (µs)
OUTPUT VOLTAGE CHANGE
2
1021 G31
102413
3
0
4
I
SOURCE
= 2-10mA
I
SOURCE
= 0.2mA
I
SINK
= 0.6mA
I
SINK
= 0.8mA
I
SINK
= 1mA
I
SINK
= 2-10mA
10mV
50mV
∆I
SINK
= 100µA
P-P
∆I
SOURCE
= 100µA
P-P
I
SOURCE
= 0
NOTE VERTICAL SCALE CHANGE
BETWEEN SOURCING AND SINKING
Load Transient Response
LT1021-10, C
LOAD
= 1000pF
TIME (µs)
OUTPUT VOLTAGE CHANGE
2
1021 G32
102413
3
0
4
I
SOURCE
= 2-10mA
I
SOURCE
= 0.5mA
I
SINK
= 0.8mA
I
SINK
= 1.2mA
I
SINK
= 1.4mA
I
SINK
= 2-10mA
5mV
20mV
∆I
SINK
= 100µA
P-P
∆I
SOURCE
= 100µA
P-P
I
SOURCE
= 0
NOTE VERTICAL SCALE CHANGE
BETWEEN SOURCING AND SINKING
Output Noise 0.1Hz to 10Hz
LT1021-10
TIME (MINUTES)
035
1021 G33
12
46
OUTPUT VOLTAGE NOISE (10µV/DIV)
10µV (1ppm)
FILTERING = 1 ZERO AT 0.1Hz
2 POLES AT 10Hz