LPC844 datasheet(44/97 Pages) NXP

44 / 97 page

LPC84x

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Product data sheet

Rev. 1.7 — 27 February 2018

44 of 97

NXP Semiconductors

LPC84x

32-bit Arm Cortex-M0+ microcontroller

10. Thermal characteristics

The average chip junction temperature, Tj (C), can be calculated using the following

equation:

(1)

• Tamb = ambient temperature (C),

• Rth(j-a) = the package junction-to-ambient thermal resistance (C/W)

• PD = sum of internal and I/O power dissipation

The internal power dissipation is the product of IDD and VDD. The I/O power dissipation of

the I/O pins is often small and many times can be negligible. However it can be significant

in some applications.

amb

th j

–







Table 10.

Thermal resistance

Symbol Parameter

Conditions

Max/min

Unit

HVQFN33 package

Rth(j-a)

thermal resistance from junction-to-ambient

JEDEC (4.5 in

 4 in); still air

 15 %

C/W

single-layer (4.5 in

 3 in); still air

114

 15 %

C/W

Rth(j-c)

thermal resistance from junction-to-case

 15 %

C/W

HVQFN48 package

Rth(j-a)

thermal resistance from junction-to-ambient

JEDEC (4.5 in

 4 in); still air

 15 %

C/W

single-layer (4.5 in

 3 in); still air

 15 %

C/W

Rth(j-c)

thermal resistance from junction-to-case

 15 %

C/W

LQFP48 package

Rth(j-a)

thermal resistance from junction-to-ambient

JEDEC (4.5 in

 4 in); still air

 15 %

C/W

single-layer (4.5 in

 3 in); still air

115

 15 %

C/W

Rth(j-c)

thermal resistance from junction-to-case

 15 %

C/W

LQFP64 package

Rth(j-a)

thermal resistance from junction-to-ambient

JEDEC (4.5 in

 4 in); still air

 15 %

C/W

single-layer (4.5 in

 3 in); still air

 15 %

C/W

Rth(j-c)

thermal resistance from junction-to-case

 15 %

C/W

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