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PDF AOZ1036 Datasheet ( Hoja de datos )

Número de pieza AOZ1036
Descripción 5A Synchronous Buck Regulator
Fabricantes Alpha & Omega Semiconductors 
Logotipo Alpha & Omega Semiconductors Logotipo



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AOZ1036 Hoja de datos, Descripción, Manual
AOZ1036
EZBuck™ 5A Synchronous Buck Regulator
Not Recommended For New Designs
General Description
The AOZ1036 is a high efficiency, easy to use, 5A
synchronous buck regulator. The AOZ1036 works from
4.5V to 18V input voltage range, and provides up to 5A of
continuous output current with an output voltage
adjustable down to 0.8V.
The AOZ1036 comes in both a 5x4 DFN-8 and an
exposed pad SO-8 package and is rated over a
-40°C to +85°C ambient temperature range.
Replacement Part: AOZ3018PI
Features
z 4.5V to 18V operating input voltage range
z Synchronous Buck: 55mΩ internal high-side switch
and 19mΩ Internal low-side switch
z High efficiency: up to 95%
z Internal soft start
z Output voltage adjustable to 0.8V
z 5A continuous output current
z Fixed 500kHz PWM operation
z Cycle-by-cycle current limit
z Pre-bias start-up
z Short-circuit protection
z Thermal shutdown
z Thermally enhanced 5x4 DFN-8 and exposed pad
SO-8 packages
Applications
z Point of load DC/DC converters
z LCD TV
z Set top boxes
z DVD / Blu-ray players/recorders
z Cable modems
z PCIe graphics cards
Typical Application
VIN
C1
22µF
Ceramic
RC
CC
VIN
EN AOZ1036 LX
COMP
AGND
FB
PGND
L1
4.7µH
VOUT
R1
C2, C3
22µF
Ceramic
R2
Rev. 1.1 September 2010
Figure 1. 3.3V 5A Synchronous Buck Regulator
www.aosmd.com
Page 1 of 17

1 page

AOZ1036 pdf
Typical Performance Characteristics
Circuit of Figure 1. TA = 25°C, VIN = VEN = 12V, VOUT = 3.3V unless otherwise specified.
Light Load Operation
Full Load (CCM) Operation
2ms/div
Start Up to Full Load
Vin ripple
0.1V/div
Vo ripple
20mV/div
IL
1A/div
VLX
10V/div
Vin
10V/div
1µs/div
Short Circuit Protection
AOZ1036
Vin ripple
0.1V/div
Vo ripple
20mV/div
IL
1A/div
VLX
10V/div
LX
10V/div
1ms/div
Vo
2V/div
lin
1A/div
Short Circuit Recovery
50µs/div
LX
10V/div
Vo
2V/div
IL
2A/div
Vo
2V/div
IL
2A/div
1ms/div
Rev. 1.1 September 2010
www.aosmd.com
Page 5 of 17

5 Page

AOZ1036 arduino
AOZ1036
The compensation capacitor CC and resistor RC together
make a zero. This zero is put somewhere close to the
dominate pole fp1 but lower than 1/5 of selected
crossover frequency. CC can is selected by:
CC
=
--------------1----.-5----------------
2π × RC × fP1
The equation above can also be simplified to:
CC
=
C-----O-----×-----R-----L-
RC
An easy-to-use application software which helps to
design and simulate the compensation loop can be found
at www.aosmd.com.
Thermal Management and Layout
Consideration
In the AOZ1036 buck regulator circuit, high pulsing
current flows through two circuit loops. The first loop
starts from the input capacitors, to the VIN pin, to the
LX pin, to the filter inductor, to the output capacitor
and load, and then return to the input capacitor through
ground. Current flows in the first loop when the high side
switch is on. The second loop starts from inductor, to the
output capacitors and load, to the low side NMOSFET.
Current flows in the second loop when the low side
NMOSFET is on.
In PCB layout, minimizing the two loops area reduces the
noise of this circuit and improves efficiency. A ground
plane is strongly recommended to connect input
capacitor, output capacitor, and PGND pin of the
AOZ1036.
In the AOZ1036 buck regulator circuit, the major power
dissipating components are the AOZ1036 and the output
inductor. The total power dissipation of converter circuit
can be measured by input power minus output power.
Ptotal_loss = VIN × IIN VO × IO
The power dissipation of inductor can be approximately
calculated by output current and DCR of inductor.
Pinductor_loss = IO2 × Rinductor × 1.1
The actual junction temperature can be calculated with
power dissipation in the AOZ1036 and thermal
impedance from junction to ambient.
Tjunction = (Ptotal_lossPinductor_loss) × ΘJA
The maximum junction temperature of AOZ1036 is
150ºC, which limits the maximum load current capability.
Please see the thermal de-rating curves for maximum
load current of the AOZ1036 under different ambient
temperature.
The thermal performance of the AOZ1036 is strongly
affected by the PCB layout. Extra 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.
1. The LX pins are connected to internal PFET and
NFET drains. They are low resistance thermal
conduction path and most noisy switching node.
Connected a large copper plane to LX pin to help
thermal dissipation.
2. Do not use thermal relief connection to the VIN and
the PGND pin. Pour a maximized copper area to the
PGND pin and the VIN pin to help thermal
dissipation.
3. Input capacitor should be connected to the VIN pin
and the PGND pin as close as possible.
4. A ground plane is preferred. If a ground plane is not
used, separate PGND from AGND and connect them
only at one point to avoid the PGND pin noise
coupling to the AGND pin.
5. Make the current trace from LX pins to L to Co to the
PGND as short as possible.
6. Pour copper plane on all unused board area and
connect it to stable DC nodes, like VIN, GND or
VOUT.
7. Keep sensitive signal trace far away from the LX
pins.
Rev. 1.1 September 2010
www.aosmd.com
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