LT3028 LINER [Linear Technology], LT3028 Datasheet - Page 4

• Manufacturer Part Number: LT3028
• Description: Dual 100mA/500mA Low Dropout, Low Noise,Micropower Regulators with Independent Inputs
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
LT3028
Note 4: Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply for
all possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range must be
limited. When operating at maximum output current, the input voltage
range must be limited.
Note 5: To satisfy requirements for minimum input voltage, the LT3028 is
tested and specified for these conditions with an external resistor divider
(two 250k resistors) for an output voltage of 2.44V. The external resistor
divider will add a 5µA DC load on the output.
Note 6: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout, the
output voltage will be equal to: V
TYPICAL PERFOR A CE CHARACTERISTICS
4
500
450
400
350
300
250
200
150
100
500
450
400
350
300
250
200
150
100
50
50
0
0
0
0
Output 2
Typical Dropout Voltage
Output 1
Typical Dropout Voltage
10 20 30 40 50 60 70 80 90 100
50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
T
J
T
= 125°C
T
J
J
T
= 125°C
J
= 25°C
= 25°C
IN
– V
W
DROPOUT
3028 G01
3028 G04
U
.
500
450
400
350
300
250
200
150
100
500
450
400
350
300
250
200
150
100
50
50
0
0
0
0
Output 2
Guaranteed Dropout Voltage
Output 1
Guaranteed Dropout Voltage
50 100 150 200 250 300 350 400 450 500
10 20 30 40 50 60 70 80 90 100
= TEST POINTS
= TEST POINTS
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
T
T
T
T
J
J
J
J
Note 7: GND pin current is tested with V
load. This means the device is tested while operating in its dropout region
or at the minimum input voltage specification. This is the worst-case GND
pin current. The GND pin current will decrease slightly at higher input
voltages. Total GND pin current is equal to the sum of GND pin currents
from Output 1 and Output 2.
Note 8: ADJ1 and ADJ2 pin bias current flows into the pin.
Note 9: SHDN1 and SHDN2 pin current flows into the pin.
Note 10: For the LT3028 dropout voltage will be limited by the minimum
input voltage specification under some output voltage/load conditions. See
the curve of Minimum Input Voltage in the Typical Performance
Characteristics.
≤ 125°C
≤ 125°C
≤ 25°C
≤ 25°C
3028 G05
3028 G02
500
450
400
350
300
250
200
150
100
500
450
400
350
300
250
200
150
100
50
50
0
0
–50
–50
Output 2 Dropout Voltage
Output 1 Dropout Voltage
I
L
= 50mA
–25
–25
IN
= 2.44V and a current source
I
L
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
= 100mA
I
L
= 100mA
25
25
I
I
L
L
= 250mA
= 10mA
50
50
I
I
L
L
I
L
= 50mA
= 10mA
= 1mA
75
75
I
L
I
= 500mA
L
100
100
= 1mA
3028 G06
3028 G03
3028f
125
125