aoz1010 Alpha & Omega Semiconductor, aoz1010 Datasheet - Page 11

• Manufacturer Part Number: aoz1010
• Description: Ezbuck 2a Simple Regulator
• Manufacturer: Alpha & Omega Semiconductor

The junction to ambient temperature can be got from
power dissipation in the AOZ1010 and thermal imped-
ance from junction to ambient.
The maximum junction temperature of AOZ1010 is
145°C, which limits the maximum load current capability.
Please see the thermal de-rating curves for the maximum
load current of the AOZ1010 under different ambient
temperatures.
The thermal performance of the AOZ1010 is strongly
affected by the PCB layout. Extra care should be taken
by users during the 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 below illustrates a
single layer PCB layout example as a reference.
1. Do not use thermal relief connection to the V
T
Rev. 1.0 November 2006
(jun-amb)
the PGND pin. Pour a maximized copper area to
the PGND pin and the V
dissipation.
=
(
P
Cin
totalloss
Cd
R2
R1
AGND
PGND
–
IN
P
VIN
pin to help thermal
inductorloss
FB
1
2
3
4
) Θ
Figure 3. AOZ1010 PCB Layout
Cc
SO-8
×
IN
JA
Rc
www.aosmd.com
and
8
7
6
5
2. Input capacitor should be connected to the V
3. A ground plane is preferred. If a ground plane is not
4. Make the current trace from LX pins to L to Co to the
5. Pour copper plane on all unused board area and
6. The two LX pins are connected to the internal PFET
7. Keep sensitive signal traces such as trace connect-
EN
LX
LX
COMP
and the PGND pin as close as possible.
used, separate PGND from AGND and connect them
only at one point to avoid the PGND pin noise
coupling to the AGND pin. In this case, a decoupling
capacitor should be connected between V
AGND pin.
PGND as short as possible.
connect it to stable DC nodes, like V
drain. They are low resistance thermal conduction
path and most noisy switching node. Connect a
copper plane to the LX pin to help thermal
dissipation. This copper plane should not be too
large otherwise switching noise may be coupled to
other parts of the circuit.
ing FB pin and COMP pin away from the LX pins.
L
Cout
IN
, GND, or V
AOZ1010
Page 11 of 14
IN
pin and
IN
pin
OUT
.