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AOZ1034 Schematic ( PDF Datasheet ) - Alpha & Omega Semiconductors

Teilenummer AOZ1034
Beschreibung 4A Synchronous Buck Regulator
Hersteller Alpha & Omega Semiconductors
Logo Alpha & Omega Semiconductors Logo 




Gesamt 18 Seiten
AOZ1034 Datasheet, Funktion
AOZ1034
EZBuck™ 4A Synchronous Buck Regulator
General Description
The AOZ1034 is a synchronous high efficiency, simple to
use, 4A buck regulator. The AOZ1034 works from a 4.5V
to 18V input voltage range, and provides up to 4A of
continuous output current with an output voltage
adjustable down to 0.8V.
The AOZ1034 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.
Features
z 4.5V to 18V operating input voltage range
z Synchronous rectification: 60mΩ internal high-side
switch and 20mΩ Internal low-side switch
z High efficiency: up to 95%
z Internal soft start
z Output voltage adjustable to 0.8V
z 4A 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 conversion
z PCIe graphics cards
z Set top boxes
z DVD drives and HDD
z LCD panels
z Cable modems
z Telecom/Networking/Datacom equipment
Typical Application
VIN
C1
22µF
Ceramic
RC
CC
VIN
EN AOZ1034 LX
COMP
AGND
FB
PGND
L1
4.7µH
VOUT
R1
C2, C3
22µF
Ceramic
R2
Rev. 1.1 September 2010
Figure 1. 3.3V 4A Synchronous Buck Regulator
www.aosmd.com
Page 1 of 18
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AOZ1034 Datasheet, Funktion
Efficiency
AOZ1034
100%
Efficiency (VIN = 12V) vs. Load Current
90%
80%
70%
60%
50%
5V OUTPUT
3.3V OUTPUT
1.8V OUTPUT
1.2V OUTPUT
40%
0 0.5
1.0 1.5 2.0 2.5
Load Current (A)
3.0 3.5 4.0
100%
Efficiency (VIN = 5V) vs. Load Current
90%
80%
70%
60%
50%
3.3V OUTPUT
1.8V OUTPUT
1.2V OUTPUT
40%
0 0.5
1.0 1.5 2.0 2.5
Load Current (A)
3.0 3.5 4.0
Rev. 1.1 September 2010
www.aosmd.com
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AOZ1034 pdf, datenblatt
AOZ1034
The AOZ1034DI comes in a standard 5x4 DFN-8 or
exposed pad SO-8 package. 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. For full load (4A) application,
also connect the LX pads to the bottom layer by
thermal vias to enhance the 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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