Datasheet
LT3090
3
3090fa
For more information www.linear.com/LT3090
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum IN Voltage
(Note 11)
I
LOAD
= 100mA
I
LOAD
= 600mA
l
–1.9
–1.5
–1.5
V
V
SET Pin Current (I
SET
) V
IN
= –1.9V, I
LOAD
= 1mA,
–36V < V
IN
< –1.9V, 1mA < I
LOAD
< 600mA (Note 5)
l
49.5
49
50
50
50.5
51
µA
µA
Output Offset V
oltage V
OS
(V
OUT
– V
SET
)
V
IN
= –1.9V, I
LOAD
= 1mA,
–36V < V
IN
< –1.9V, 1mA < I
LOAD
< 600mA (Note 5)
l
–1
–2
1
2
mV
mV
Line Regulation: ΔI
SET
/ΔV
IN
Line Regulation: ΔV
OS
/ΔV
IN
V
IN
= –1.9V to –36V, I
LOAD
= 1mA
V
IN
= –1.9V to –36V, I
LOAD
= 1mA
1.5
2.5
nA/V
µV/V
Load Regulation: ΔI
SET
Load Regulation: ΔV
OS
I
LOAD
= 1mA to 600mA
I
LOAD
= 1mA to 600mA, V
IN
= –1.9V (Note 6)
l
0.5
1.2
2.5
nA
mV
Output Regulation with SET
Pin V
oltage Change:
ΔI
SET
/ΔV
SET
ΔV
OS
/ΔV
SET
V
SET
= 0V to –32V, V
IN
= –36V, I
LOAD
= 1mA
V
SET
= 0V to –32V, V
IN
= –36V, I
LOAD
= 1mA
l
l
0.2
2.5
1
30
nA/V
µV/V
Dropout V
oltage
V
IN
= V
OUT(NOMINAL)
(Note 7)
I
LOAD
= 1mA
I
LOAD
= 1mA
I
LOAD
= 100mA
I
LOAD
= 100mA
I
LOAD
= 600mA
I
LOAD
= 600mA
l
l
l
185
195
300
230
270
240
300
360
450
mV
mV
mV
mV
mV
mV
GND
Pin Current
V
IN
= V
OUT(NOMINAL)
(Note 8)
I
LOAD
= 10µA
I
LOAD
= 1mA
I
LOAD
= 100mA
I
LOAD
= 600mA
l
l
l
l
1
1.05
2.6
11.5
1.4
1.4
5
22.5
mA
mA
mA
mA
Error Amplifier RMS Output
Noise (Note 12)
I
LOAD
= 600mA, BW = 10Hz to 100kHz, C
OUT
= 4.7µF, C
SET
= 0.1µF 18 µV
RMS
Reference Current RMS
Output Noise (Note 12)
BW = 10Hz to 100kHz 10 nA
RMS
Ripple Rejection
V
IN
– V
OUT
= –1.5V (Avg)
V
RIPPLE
= 500mV
P-P
, f
RIPPLE
= 120Hz, I
LOAD
= 100mA, C
OUT
= 4.7µF, C
SET
= 0.47µF
V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 10kHz, I
LOAD
= 600mA, C
OUT
= 4.7µF, C
SET
= 0.47µF
V
RIPPLE
= 50mV
P-P
, f
RIPPLE
= 1MHz, I
LOAD
= 600mA, C
OUT
= 4.7µF, C
SET
= 0.47µF
70 85
50
20
dB
dB
dB
SHDN Pin Turn-ON
Threshold
Positive SHDN Rising
Negative SHDN Rising
(in Magnitude)
l
l
1.14
–1.36
1.23
–1.27
1.32
–1.18
V
V
SHDN Pin Hysteresis Positive
SHDN Hysteresis
Negative SHDN Hysteresis
180
190
mV
mV
SHDN Pin Current
(Note 10)
V
SHDN
= 0V
V
SHDN
= 15V
V
SHDN
= –15V
–7
21
–4.5
±1
30
µA
µA
µA
Quiescent Current in
Shutdown
V
IN
= –6V, V
SHDN
= 0V
V
IN
= –6V, V
SHDN
= 0V
l
0.1 1
10
µA
µA
Internal Current Limit
(Note 13)
V
IN
= –1.9V, V
OUT
= 0V
V
IN
= –13V, V
OUT
= 0V
V
IN
= –36V, V
OUT
= 0V
V
IN
= –1.9V, ΔV
OUT
< 10mV
l
l
l
650
20
630
750
350
35
730
850
60
830
mA
mA
mA
mA
Programmable Current
Limit
Programming Scale Factor: –36V < V
IN
< –1.9V, I
OUT
> 50mA (Note 14)
Max I
OUT
: V
IN
= –1.9V, R
ILIM
= 20k
Max I
OUT
: V
IN
= –1.9V, R
ILIM
= 100k
l
l
460
85
10
500
100
540
115
A•
kΩ
mA
mA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
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