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LT3065 Series

3065fc

For more information www.linear.com/LT3065

applicaTions inForMaTion

Using a DFN package, the thermal resistance ranges from

31°C/W to 35°C/W depending on the copper area. So the

junction temperature rise above ambient approximately

equals:

0.614W • 35°C/W = 21.5°C

The maximum junction temperature equals the maxi-

mum ambient temperature plus the maximum junction

temperature rise above ambient or:

TJMAX = 85°C + 21.5°C = 106.5°C

Protection Features

The LT3065 incorporates several protection features that

make it ideal for use in battery-powered circuits. In ad-

dition to the normal protection features associated with

monolithicregulators,suchascurrentlimitingandthermal

limiting, the device also protects against reverse input

voltages, reverse output voltages and reverse output-to-

input voltages.

Current limit protection and thermal overload protection

protect the device against current overload conditions

at the LT3065’s output. The typical thermal shutdown

temperature is 165°C with about 7°C of hysteresis. For

normal operation, do not exceed a junction temperature

of 125°C (E-, I-grades) or 150°C (MP-, H-grades).

TheLT3065INpinwithstandsreversevoltagesof50V.The

device limits current flow to less than 1μA (typically less

than 25nA) and no negative voltage appears at OUT. The

device protects both itself and the load against batteries

that are plugged in backwards.

Figure 9. Reverse Output Current

VOUT (V)

0.1

0.3

0.4

0.5

1.0

0.7

3055 F09

0.2

0.8

0.9

0.6

VIN = 0

The LT3065 incurs no damage if its output is pulled be-

low ground. If the input is left open circuit or grounded,

the output can be pulled below ground by 50V. No cur-

rent flows through the pass transistor from the output.

However, current flows in (but is limited by) the feedback

resistor divider that sets the output voltage. Current flows

from the bottom resistor in the divider and from the ADJ

pin’s internal clamp through the top resistor in the divider

to the external circuitry pulling OUT below ground. If a

voltage source powers the input, the output sources cur-

rent equal to its current limit capability and the LT3065

protects itself by thermal limiting. In this case, grounding

the SHDN pin turns off the device and stops the output

from sourcing current.

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