eup3406 Eutech Microelectronics Inc, eup3406 Datasheet - Page 10

• Manufacturer Part Number: eup3406
• Description: 1.5mhz, 600ma Synchronous Step-down Converter
• Manufacturer: Eutech Microelectronics Inc

Thermal Considerations
To avoid the EUP3406 from exceeding the maximum
junction temperature, the user will need to do a thermal
analysis. The goal of the thermal analysis is to determine
whether the operating conditions exceed the maximum
junction temperature of the part. The temperature rise is
given by:
Where P
the regulator ; θ
junction of the die to the ambient temperature.
The junction temperature, T
Where T
T
of 125°C.
DS3406 Ver1.2 Nov. 2007
J
should be below the maximum junction temperature
T
T
A
R
D
J
=T
=(P
=I
is the ambient temperature.
LOAD
A
D
+T
)(θ
R
2 × R
JA
JA
)
is the thermal resistance from the
DS(ON)
J
, is given by:
is the power dissipated by
10
PC Board Layout Checklist
When laying out the printed circuit board, the following
guidelines should be used to ensure proper operation of
the EUP3406.
1. The input capacitor C
2. The power traces, consisting of the GND trace, the
3. The V
4. Keep the switching node, SW, away from the
closely as possible. This capacitor provides the AC
current to the internal power MOSFETs.
SW trace and the V
direct and wide.
resistors. The resistive divider R1/R2 must be
connected between the C
sensitive V
FB
pin should connect directly to the feedback
FB
node.
IN
IN
trace should be kept short,
OUT
should connect to V
EUP3406
and ground.
IN
as