ADP2106 Analog Devices, ADP2106 Datasheet - Page 23

• Manufacturer Part Number: ADP2106
• Description: 1.5 Amp Synchronous, Step-Down DC-to-DC Converter
• Manufacturer: Analog Devices

For example, in an application where the ADP2107(1.8 V) is
used with an input voltage o
maximum ambient temperature of 85°C, at a load current of 2 A,
the most significant contributor of power dissipation in the dc-to-
dc converter package is the conduction loss of the power switches
Using the graph of switch on resistance vs. temperature (see
Figure 30), as well as the equation of power loss given in the
Pow S
in th
er wit h Con
e package can
P
[109 mΩ × 0.5 + 90 mΩ × 0.5] × (2 A)
SW − COND
c
= [R
duction Losses s
DS(ON) − P
be calculated by the following:
× D + R
f 3.6 V, a load current of 2 A, and a
DS(ON) − N
ection, the power dissipation
× (1
2
≈ 400 mW
− D)] × I
OUT
2
=
Rev. C | Page 23 of 36
.
The θ
Table 3. Therefore, the rise in temperature of the package due to
power dissipation is
The junction temperature of the converter is
Because the junction temperature of the converter is below the
maximum junction temperature of 125°C, this application operates
reliably from a thermal point of view.
T
T
JA
R
J
= T
for the LFCSP_VQ package is 40°C/W, as shown in
= θ
JA
A
+ T
× P
R
D
= 85°C + 16°C = 101°C
= 40°C/W × 0.40 W = 16°C
ADP2105/ADP2106/ADP2107