aoz1210 Alpha & Omega Semiconductor, aoz1210 Datasheet - Page 11

• Manufacturer Part Number: aoz1210
• Description: 2a Simple Buck Regulator
• Manufacturer: Alpha & Omega Semiconductor

dissipation of converter circuit can be measured by input
power minus output power.
The power dissipation of inductor can be approximately
calculated by output current and DCR of the inductor.
The power dissipation of the diode is:
The actual AOZ1210 junction temperature can be
calculated with power dissipation in the AOZ1210 and
thermal impedance from junction to ambient.
The maximum junction temperature of AOZ1210 is
145°C, which limits the maximum load current capability.
P
P
P
T
Rev. 1.3 December 2007
diode_loss
total _loss
inductor _loss
junction
+ +
=
=
=
P
V
I
=
T
total _loss
O
IN
I
ambient
O
2
V
VIN
I
IN
F
R
–
inductor
Cc
–
P
V
1
inductor _loss
O
–
Rc
--------- -
V
V
I
IN
5 COMP
8 VBIAS
O
O
6 EN
7 Vin
1.1
Figure 3. Layout Example of the AOZ1210
AOZ1210 /2
JA
www.aosmd.com
The thermal performance of the AOZ1210 is strongly
affected by the PCB layout. Care should be taken by
users during design process to ensure that the IC will
operate under the recommended environmental
conditions.
Several layout tips are listed below for the best electric
and thermal performance. Figure 3 is a layout example.
1. Do not use thermal relief connection to the V
2. Input capacitor should be connected as close as
3. Make the current trace from LX pins to L to C
4. Pour copper plane on all unused board area and
5. Keep sensitive signal traces such as the trace
3 GND
2 BST
1 LX
4 FB
the GND pin. Pour a maximized copper area to the
GND pin and the V
possible to the V
GND as short as possible.
connect it to stable DC nodes, like V
connecting FB and COMP pins away from the
LX pins.
C2
IN
L1
IN
and GND pins.
C
2
pin to help thermal dissipation.
Vo
IN
, GND or V
AOZ1210
Page 11 of 14
IN
O
and
to
OUT
.