TPS544B20_15 Datasheet, PDF (6/74 Pages) Texas Instruments – TPS544x20 4.5-V to 18-V, 20-A, and 30-A SWIFT™ Synchronous Buck Converters with PMBus™

TPS544B20, TPS544C20
SLUSB69 – MAY 2014
www.ti.com
7.4 Thermal Information
R_θJA
R_θJCtop
R_θJB
ψ_JT
ψ_JB
R_θJCbot
THERMAL METRIC⁽¹⁾
Junction-to-ambient thermal resistance⁽²⁾
Junction-to-case (top) thermal resistance⁽³⁾
Junction-to-board thermal resistance
Junction-to-top characterization parameter⁽⁴⁾
Junction-to-board characterization parameter⁽⁵⁾
Junction-to-case (bottom) thermal resistance⁽⁶⁾
TPS544B20
TPS544C20
27.5
13.9
4.0
0.3
3.9
0.9
UNIT
°C/W
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
(2) The junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a JEDEC-standard, high-K board, as
specified in JESD51-7, in an environment described in JESD51-2a.
(3) The junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the package top. No specific JEDEC-
standard test exists, but a close description can be found in the ANSI SEMI standard G30-88.
(4) The junction-to-top characterization parameter, ψ_JT, estimates the junction temperature of a device in a real system and is extracted
from the simulation data for obtaining R_θJA, using a procedure described in JESD51-2a (sections 6 and 7).
(5) The junction-to-board characterization parameter, ψ_JB, estimates the junction temperature of a device in a real system and is extracted
from the simulation data for obtaining R_θJA, using a procedure described in JESD51-2a (sections 6 and 7).
(6) The junction-to-case (bottom) thermal resistance is obtained by simulating a cold plate test on the exposed (power) pad. No specific
JEDEC standard test exists, but a close description can be found in the ANSI SEMI standard G30-88.
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