R7FA6T2AB3CFM datasheet(26/93 Pages) RENESAS

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Vr(VCC)

VCC

1 / fr(VCC)

Figure 2.2

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, see Table 2.11.

Table 2.11

Thermal Resistance

Parameter

Package

Symbol

Value*1

Unit

Test conditions

Thermal

Resistance　　　　　

100-pin LQFP (PLQP0100KB-B)

θja　　　　

°C/W　　　　

JESD 51-2 and 51-7

compliant　　　　

64-pin LQFP (PLQP0064KB-C)

64-pin QFN (PWQN0064LB-A)

48-pin LQFP (PLQP0048KB-B)

48-pin QFN (PWQN0048KC-A)

100-pin LQFP (PLQP0100KB-B)

Ψjt　　　　

0.65

°C/W　　　　

JESD 51-2 and 51-7

compliant　　　　

64-pin LQFP (PLQP0064KB-C)

0.69

64-pin QFN (PWQN0064LB-A)

0.15

48-pin LQFP (PLQP0048KB-B)

2.01

48-pin QFN (PWQN0048KC-A)

0.17

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.

RA6T2 Datasheet

2. Electrical Characteristics

R01DS0400EJ0120 Rev.1.20

Mar 31, 2022

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