LM2599 datasheet(5/31 Pages) NSC

5 / 31 page

All Output Voltage Versions

Electrical Characteristics (Continued)

Note 10: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force the output transistor

switch OFF.

Note 11: VIN = 40V.

Note 12: Junction to ambient thermal resistance (no external heat sink) for the package mounted TO-220 package mounted vertically, with the leads soldered to a

printed circuit board with (1 oz.) copper area of approximately 1 in2.

Note 13: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 0.5 in2 of (1 oz.) copper area.

Note 14: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 2.5 in2 of (1 oz.) copper area.

Note 15: Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in2 of (1 oz.) copper area on

the LM2599S side of the board, and approximately 16 in2 of copper on the other side of the p-c board. See application hints in this data sheet and the thermal model

in Switchers Made Simple version 4.2.1 (or later) software.

Typical Performance Characteristics (Circuit of Figure 1)

Normalized

Output Voltage

DS012582-2

Line Regulation

DS012582-3

Efficiency

DS012582-4

Switch Saturation

Voltage

DS012582-5

Switch Current Limit

DS012582-6

Dropout Voltage

DS012582-7

Operating

Quiescent Current

DS012582-8

Shutdown

Quiescent Current

DS012582-9

Minimum Operating

Supply Voltage

DS012582-10

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