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SC1480AEVB 数据表(PDF) 13 Page - Semtech Corporation

部件名 SC1480AEVB
功能描述  DDR and DDR Memory VTT power Supply Controller
PDF  23 Pages
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制造商  SEMTECH [Semtech Corporation]
网页  http://www.semtech.com
标志 SEMTECH - Semtech Corporation

SC1480AEVB 数据表(HTML) 13 Page - Semtech Corporation

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13
 2003 Semtech Corp.
www.semtech.com
SC1480A
POWER MANAGEMENT
Applications Information (Cont.)
T
A = ambient temperature (°C)
P
D = power dissipation in (W)
θ
JA = thermal impedance junction to ambient from
absolute maximum ratings (°C/W)
The power dissipation may be calculated as follows:
W
f
Q
V
I
VCCA
P
g
g
VCCA
D
•
•
+
•
=
Where:
VCCA = chip supply voltage (V)
I
VCCA = operating current (A)
V
g = gate drive voltage, typically 5V (V)
Q
g = .ET gate charge, from the .ET datasheet (C)
f = switching frequency (kHz)
Inserting the following values as an example:
T
A = 85°C
θ
JA = 100°C/W
VCCA = 5V
I
VCCA = 1100µA (data sheet maximum)
V
g = 5V
Q
g = 60nC
f = 342kHz
gives us:
W
108
.
0
10
342
10
60
5
10
1100
5
P
3
9
6
D
=
•
•
•
•
+
•
•
=
−
−
and
C
8
.
95
100
108
.
0
85
T
J
°
=
•
+
=
As can be seen, the heating effects due to internal power
dissipation are practically negligible, thus requiring no
special consideration thermally during layout.



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