Data Sheet

ADPL42001

analog.com

Rev. 0

9 of 17

Junction temperature greater than +125°C degrades operating lifetimes. Calculate the maximum allowable output

current, using the following formula:

ILOAD(MAX) =

(125 − TA_MAX)

θJA × (VIN − VOUT)

Example: TA_MAX = +70°C, VIN = 24V, VOUT = 5V, θJA = 42°C/W for TDFN package

ILOAD(MAX) =

(125 − 70)

42 × (24 − 5)

≅ 69mA

Table 4. Thermal Resistance

PACKAGE TYPE

θJA

θJC

UNIT

6 TSOT

110

50

°C/W

6 TDFN

42

9

°C/W

Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board.