LT3028 データシートの表示（PDF） - Linear Technology
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LT3028
Linear Technology
LT3028 Datasheet PDF : 16 Pages
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LT3028
ELECTRICAL CHARACTERISTICS
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: VIN – VDROPOUT.
Note 7: GND pin current is tested with VIN = 2.44V and a current source
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.
TYPICAL PERFOR A CE CHARACTERISTICS
Output 2
Typical Dropout Voltage
500
450
400
350
TJ = 125°C
300
250
200
TJ = 25°C
150
100
50
0
0 10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
3028 G01
Output 1
Typical Dropout Voltage
500
450
400
TJ = 125°C
350
300
250
200
TJ = 25°C
150
100
50
0
0 50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
3028 G04
Output 2
Guaranteed Dropout Voltage
500
= TEST POINTS
450
400
350
TJ ≤ 125°C
300
250
TJ ≤ 25°C
200
150
100
50
0
0 10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
3028 G02
Output 1
Guaranteed Dropout Voltage
500
= TEST POINTS
450
400
350
TJ ≤ 125°C
300
TJ ≤ 25°C
250
200
150
100
50
0
0 50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
3028 G05
4
Output 2 Dropout Voltage
500
450
400
350
IL = 100mA
300
250
200
IL = 50mA
150
IL = 10mA
100
IL = 1mA
50
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3028 G03
Output 1 Dropout Voltage
500
450
IL = 500mA
400
IL = 250mA
350
IL = 100mA
300 IL = 50mA
250
200
150
100
50
0
–50 –25
IL = 1mA
IL = 10mA
0 25 50 75 100 125
TEMPERATURE (°C)
3028 G06
3028f
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