Datasheet

7
LT1021
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
Shunt Characteristics LT1021-7
Shunt Mode Current Limit
LT1021-7
Thermal Regulation LT1021-7
OUTPUT TO GROUND VOLTAGE (V)
0
0
CURRENT INTO OUTPUT (mA)
0.2
0.6
0.8
1.0
2
4
59
1021 G19
0.4
13
6
7
8
1.2
INPUT PIN OPEN
T
J
= 125°C
T
J
= –55°C
T
J
= 25°C
OUTPUT VOLTAGE (V)
0
0
CURRENT INTO OUTPUT (mA)
10
30
40
50
4
8
10 18
LT1021 G20
20
26
12
14
16
60
INPUT PIN OPEN
TIME (ms)
OUTPUT CHANGE (mV)
–1.0
–0.5
0
140
LT1021 G21
–1.5
20
60
100
0
40
80
120
LOAD
REGULATION
THERMAL
REGULATION*
I
LOAD
= 10mA
*INDEPENDENT OF TEMPERATURE COEFFICIENT
V
IN
= 27V
∆POWER = 200mW
Load Regulation
LT1021-7, LT1021-10
TEMPERATURE (°C)
–50
9.994
9.996
OUTPUT VOLTAGE (V)
10.000
10.006
0
50
75
LT1021 G25
9.998
10.004
10.002
–25
25
100
125
Output Voltage Temperature
Drift LT1021-10
OUTPUT CURRENT (mA)
–10
OUTPUT CHANGE (mV)
1
3
5
4
2
0
–2
–4
6
1021 G26
–1
–3
–5
–6–8 –4 0 4 8
–2
2
10
V
IN
= 12V
SOURCING SINKING
Input Supply Current LT1021-10
INPUT VOLTAGE (V)
0
0
INPUT CURRENT (mA)
0.2
0.6
0.8
1.0
3530
1.8
1021 G27
0.4
5 10152025 40
1.2
1.4
1.6
T
J
= – 55°C
T
J
= 25°C
T
J
= 125°C
I
OUT
= 0
Load Transient Response
LT1021-7, C
LOAD
= 0
TIME (µs)
OUTPUT VOLTAGE CHANGE
2
LT1021 G22
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
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
LT1021-7, C
LOAD
= 1000pF
Output Noise 0.1Hz to 10Hz
LT1021-7
5µs/DIV
OUTPUT VOLTAGE CHANGE
10
LT1021 G23
501020515
15
0
20
I
SOURCE
= 2-10mA
I
SOURCE
= 0.5mA
I
SINK
= 0.6mA
I
SINK
= 0.8mA
I
SINK
= 1mA
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
TIME (MINUTES)
035
LT1021 G24
12
46
OUTPUT VOLTAGE NOISE (5µV/DIV)
5µV (0.7ppm)
FILTERING = 1 ZERO AT 0.1Hz
2 POLES AT 10Hz