LP3936 Datasheet, PDF (4/30 Pages) National Semiconductor (TI) – Lighting Management System for Six White LEDs and One RGB or FLASH LED

LP3936
SNVS259D – NOVEMBER 2003 – REVISED MAY 2013
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Operating Ratings⁽¹⁾⁽²⁾ (continued)
Ambient Temperature (T_A) Range⁽³⁾
−40°C to +85°C
(3) In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may
have to be derated. Maximum ambient temperature (T_A-MAX) is dependent on the maximum operating junction temperature (T_J-MAX-OP =
125°C), the maximum power dissipation of the device in the application (P_D-MAX), and the junction-to ambient thermal resistance of the
part/package in the application (θ_JA), as given by the following equation:
T_A-MAX = T_J-MAX-OP − (θ_JA x P_D-MAX).
Thermal Characteristics
Junction-to-Ambient Thermal Resistance (θ_JA),
NPC0032A Package ⁽¹⁾
72°C/W
(1) Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power
dissipation exists, special care must be paid to thermal dissipation issues in board design.
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