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ManualsBrandsLinear Technology ManualsIntegrated Circuits (ICs)LDO Voltage Regulator, -32 ... 0V, MSOP-12
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LT3090
8
3090fa
For more information www.linear.com/LT3090
T
J
= 25°C, unless otherwise noted.
Typical perForMance characTerisTics
Internal Current Limit Input Ripple Rejection Input Ripple Rejection
Input Ripple Rejection Ripple Rejection (120Hz)
Programmable Brick-Wall Current
Limit Internal Current Limit Internal Current Limit
Noise Spectral Density
TEMPERATURE (°C)
–75 –50 –25 0 25 50 75 100 125 150
CURRENT LIMIT (mA)
60
50
40
20
30
10
0
V
IN
= –36V
V
OUT
= 0V
INPUT-TO-OUTPUT DIFFERENTIAL (V)
0
CURRENT LIMIT (mA)
800
600
400
300
700
500
200
100
0
–12 –24 –30
3090 G31
–36–18–6
–55°C
25°C
125°C
150°C
V
OUT
= 0V
OUTPUT CURRENT (mA)
0 100 200 300 400 500 600
OUTPUT VOLTAGE (V)
–1.50
–1.25
–1.00
–0.75
–0.50
–0.25
0
3090 G28
RILIM = 100kRILIM = 20k
RILIM = 40k
R
SET
= 25K
V
IN
= –3V
TEMPERATURE (°C)
–75 –50 –25 0 25 50 75 100 125 150
CURRENT LIMIT (mA)
800
700
600
500
400
300
200
100
0
3090 G29
V
IN
= –1.9V
V
OUT
= 0V
FREQUENCY (Hz)
RIPPLE REJECTION (dB)
3090 G32
80
70
60
50
30
40
20
10
0
10 100 1k 1M 10M100k10k
V
OUT
= –2.5V
I
LOAD
= 600mA
C
SET
= 0.1µF
INPUT RIPPLE = 50mV
RMS
–3V
IN
–3.5V
IN
–4.5V
IN
FREQUENCY (Hz)
RIPPLE REJECTION (dB)
3090 G33
80
70
60
50
30
40
20
10
0
10 100 1k 1M 10M100k10k
V
OUT
= –2.5V
V
IN
= –3.5V
C
SET
= 0.1µF
INPUT RIPPLE = 50mV
RMS
I
L
= 600mA
I
L
= 300mA
I
L
= 100mA
FREQUENCY (Hz)
RIPPLE REJECTION (dB)
3090 G34
100
90
80
70
50
60
40
30
20
10
0
10 100 1k 1M 10M100k10k
V
OUT
= –2.5V
I
LOAD
= 600mA
C
SET
= 0.1µF
INPUT RIPPLE = 50mV
RMS
C
OUT
= 4.7µF, C
SET
= 0.1µF
C
OUT
= 22µF, C
SET
= 0.1µF
C
OUT
= 4.7µF, C
SET
= 0.47µF
TEMPERATURE (°C)
–75
RIPPLE REJECTION (dB)
100
90
85
95
80
75
70
25–25 75 100 125
3090 G35
1500–50 50
V
IN
= –4V
V
OUT
= –2.5V
I
LOAD
= 600mA
C
SET
= 0.47µF
FREQUENCY (Hz)
ERROR AMPLIFIER NOISE
SPECTRAL DENSITY (nV/√Hz)
REFERENCE CURRENT NOISE
SPECTRAL DENSITY (pA/√Hz)
3090 G36
1k
100
10
100
10
1
10 100 1k 100k10k
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