4

LT3028

3028f

TYPICAL PERFOR A CE 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

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.

ELECTRICAL CHARACTERISTICS

Output 2

Typical Dropout Voltage

OUTPUT CURRENT (mA)

500

450

400

350

300

250

200

150

100

50

0

3028 G01

0

102030 40

50 60 70

80 90 100

Output 1

Typical Dropout Voltage

OUTPUT CURRENT (mA)

500

450

400

350

300

250

200

150

100

50

0

3028 G02

0

102030 40

50 60 70

80 90 100

= TEST POINTS

TEMPERATURE (°C)

–50

0

50

75

3028 G03

–25

25

100

125

500

450

400

350

300

250

200

150

100

50

0

Output 2

Guaranteed Dropout Voltage

Output 2 Dropout Voltage

Output 1

Guaranteed Dropout Voltage

Output 1 Dropout Voltage

OUTPUT CURRENT (mA)

500

450

400

350

300

250

200

150

100

50

0

3028 G04

0

50 100 150 200 250 300 350 400 450 500

OUTPUT CURRENT (mA)

500

450

400

350

300

250

200

150

100

50

0

3028 G05

0

50 100 150 200 250 300 350 400 450 500

= TEST POINTS

TEMPERATURE (°C)

–50

0

50

75

3028 G06

–25

25

100

125

500

450

400

350

300

250

200

150

100

50

0