RA4T1 datasheet(27/89 Pages) RENESAS

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Vr(VCC)

VCC

1 / fr(VCC)

Figure 2.6

Ripple waveform

2.2.7

Thermal Characteristics

Maximum value of junction temperature (Tj) must not exceed the value of “section 2.2.1. Tj/Ta Definition”.

Tj is calculated by either of the following equations.

● Tj = Ta + θja × Total power consumption

● Tj = Tt + Ψjt × Total power consumption

– Tj : Junction Temperature (°C)

– Ta : Ambient Temperature (°C)

– Tt : Top Center Case Temperature (°C)

– θja : Thermal Resistance of “Junction”-to-“Ambient” (°C/W)

– Ψjt : Thermal Resistance of “Junction”-to-“Top Center Case” (°C/W)

● Total power consumption = Voltage × (Leakage current + Dynamic current)

● Leakage current of IO = Σ (IOL × VOL) /Voltage + Σ (|IOH| × |VCC – VOH|) /Voltage

● Dynamic current of IO = Σ IO (Cin + Cload) × IO switching frequency × Voltage

– Cin: Input capacitance

– Cload: Output capacitance

Regarding θja and Ψjt, refer to Table 2.11.

Table 2.11

Thermal Resistance

Parameter

Package

Symbol

Value*1

Unit

Test conditions

Thermal Resistance

32-pin QFN (PWQN0032KE-A)

θja

36.8

°C/W

JESD 51-2 and 51-7

compliant

32-pin LQFP (PLQP0032GB-A)

61.5

48-pin QFN (PWQN0048KC-A)

29.7

48-pin LQFP (PLQP0048KB-B)

62.1

64-pin LQFP (PLQP0064KB-C)

41.3

32-pin QFN (PWQN0032KE-A)

Ψjt

0.36

°C/W

JESD 51-2 and 51-7

compliant

32-pin LQFP (PLQP0032GB-A)

2.72

48-pin QFN (PWQN0048KC-A)

0.27

48-pin LQFP (PLQP0048KB-B)

2.72

64-pin LQFP (PLQP0064KB-C)

1.39

Note 1. The values are reference values when the 4-layer board is used. Thermal resistance depends on the number of layers or size of the

board. For details, refer to the JEDEC standards.

RA4T1 Datasheet

2. Electrical Characteristics

R01DS0415EJ0140 Rev.1.40

May 29, 2026

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