Datasheet

LT1999-10/LT1999-20/
LT1999-50
11
1999fb
Typical perForMance characTerisTics
LT1999 Input Referred Noise
Density vs Frequency
FREQUENCY (kHz)
0.001 0.01 0.1
NOISE DENSITY (nV/√Hz)
1000
100
10
1000
1999 G31
10000101
TEMPERATURE (°C)
–55
I
SC
(mA)
40
20
30
10
–20
0
–40
–10
–30
7020 120
1999 G32
14545–5–30 95
SINKING
SOURCING
TEMPERATURE (°C)
–55
REF PIN VOLTAGE (V)
3.0
2.5
1.0
2.0
0
1.5
0.5
7020 120
1999 G33
14545–5–30 95
SHDN MODE
ACTIVE MODE
V
+
= 5V
Short-Circuit Current
vs Temperature
REF Open Circuit Voltage
vs Temperature
SHDN Pin Current vs SHDN Pin
Voltage and Temperature
Turn-On/Turn-Off Time
vs SHDN Voltage
V
OUT
vs V
SENSE
I
S
(1mA/DIV)
SHDN PIN VOLTAGE (5V/DIV)
TIME (1µs/DIV)
1999 G35
V
SHDN
I
S
SHUTDOWN
V
CM
= 12V
V
SENSE
(V)
–0.25
V
OUT
(V)
6
4
5
1
2
3
–1
–0.05 0.15
1999 G36
0.25–0.15 0.05
V
REF
= 2.5V
LT1999-10
LT1999-20
LT1999-50
0
V
SHDN
(V)
0
I
SHDN
(µA)
–2
–4
–1
0
–3
2 4 5
1999 G34
1 3
T
A
= 150°C
T
A
= 25°C
T
A
= –55°C
V
+
= 5V
V
CM
= 12V
V
OUT
vs V
SENSE
Over the Sense
ABSMAX Range
V
SENSE
(V)
–60
V
OUT
(V)
6
4
5
1
2
3
–1
–30 30
1999 G37
600
0
V
OUT
PHASE REVERSAL FOR V
SENSE
< –25V
V
REF
= 2.5V
LT1999-10
LT1999-20
LT1999-50