# Thermal Resistance θJA of Cypress’ Automotive PMICs – KBA224663

Version 7

Author: jingw_51       Version: **

Translation - Japanese: サイプレス車載PMICの熱抵抗θJA - KBA224663 - Community Translated (JA)

Question:

What are the thermal resistances of S6BP20XA series, S6BP50XA series, and S6BP401A?

Answer:

Thermal resistances of S6BP201A, S6BP202A, and S6BP203A are the same, calculated as follows:

θJA=(150°C-25°C)/3.324W=37.6°C/W

where 150 is the absolute maximum junction temperature, 25 is the ambient temperature, and 3.324 is the power dissipation, as described in the datasheet.

Thermal resistances of S6BP501A and S6BP502A are the same calculated as follows:

θJA = (150°C-25°C)/4.28W=29.2°C/W

where 150 is the absolute maximum junction temperature, 25 is the ambient temperature, and 4.28 is the power dissipation, as described in the datasheet.

The thermal resistance of S6BP401A is calculated as follows:

θJA = (150°C-25°C)/6.94W=18°C/W

where 150 is the absolute maximum junction temperature, 25 is the ambient temperature, and 6.94 is the power dissipation, as described in the datasheet.

In summary:

 Part Number S6BP201AS6BP202AS6BP203A S6BP501AS6BP502A S6BP401A Thermal Resistance θJA 37.6°C/W 29.2°C/W 18°C/W Package ETSSOP16 16-pin (SEC016) QFN 32-pin (VNG032) QFN 40-pin (VND040) Thermal Characterization Standard 76.2 mm x 114.3 mm four-layer FR-4 board JESD51-7

See
AN218263 Automotive Power Management System Thermal Design for detailed information regarding power management thermal design.

See AN201006 Thermal Considerations and Parameters for detailed information on thermal resistance.