AX88780 Datasheet, PDF (39/49 Pages) ASIX Electronics Corporation – High-Performance Non-PCI Single-Chip 32-bit 10/100M Fast Ethernet Controller

6.1.8 Power Consumption
Symbol
Description
I_VCC2
Current consumption of VCC2, 2.5V
Power On with auto-negotiation
Current consumption of VCC2, 2.5V
10M with traffic
Current consumption of VCC2, 2.5V
100M with traffic
I_VCC3
Current consumption of VCC3, 3.3V
Power On with auto-negotiation
Current consumption of VCC3, 3.3V
10M with traffic
Current consumption of VCC3, 3.3V
100M with traffic
Note Based on 125M HCLK reference clock
6.1.9 Thermal Characteristics
A. Testing Condition
Environment
PCB Layer (2S2P)
Maximum junction temperature (^oC) -- T_J
Ambient temperature (^oC) -- T_A
Input Power (W) -- P
B. Junction to ambient thermal resistance
Symbol
Min
Typ
θ _JA (0 m/s airflow)¹
-
46.3
θ _JA (1 m/s airflow)
-
40.3
θ _JA (2 m/s airflow)
-
38.6
θ _JA (3 m/s airflow)
-
37.5
1: Note θ _JA defined as below
θ _JA
=
T_J − T_A
P
θ _JA : thermal resistance
T_J : junction temperature
T_A: ambient temperature
P : input power (watts)
T_J = T_A + (P X θ _JA )
C. Power Dissipation
Air Flow (m/s)
Power Dissipation (watt)
0
1
1.29
1.48
AX88780
Min Typ Max Units
-
220
-
mA
-
200
-
mA
-
157
-
mA
-
2.5
-
mA
-
2.5
-
mA
-
2.7
-
mA
4
125
65
1
Max
-
-
-
-
Units
o_C/W
o_C/W
o_C/W
o_C/W
2
3
1.55
1.6
39
ASIX ELECTRONICS CORPORATION