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PDF AOZ1053PI Data sheet ( Hoja de datos )
| Número de pieza | AOZ1053PI | |
| Descripción | 5A Synchronous Buck Regulator | |
| Fabricantes | Alpha & Omega Semiconductors | |
| Logotipo |  |
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AOZ1053PI
EZBuck™ 5A Synchronous Buck Regulator
General Description
The AOZ1053PI is a high efficiency, easy to use, 5A
synchronous buck regulator. The AOZ1053PI 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 AOZ1053PI comes in an exposed pad SO-8
package and is rated over a -40°C to +85°C operating
ambient temperature range.
Features
4.5V to 18V operating input voltage range
Synchronous Buck: 55mΩ internal high-side switch
and 19mΩ internal low-side switch (at 12V)
Up to 95% efficiency
External soft start
Output voltage adjustable to 0.8V
5A continuous output current
450kHz PWM operation
Cycle-by-cycle current limit
Pre-bias start-up
Short-circuit protection
Thermal shutdown
Exposed pad SO-8 package
Applications
Point of load DC/DC converters
LCD TV
Set top boxes
DVD and Blu-ray players/recorders
Cable modems
Typical Application
VIN
C1
10µF
RC
CC
CSS
VIN SS
EN
AOZ1053PI LX
COMP
FB
AGND
PGND
L1 4.7µH
R1
R2
VOUT
C2, C3
22µF
Rev. 0.4 September 2012
Figure 1. 3.3V, 5A Synchronous Buck Regulator, Fs = 450kHz
www.aosmd.com
Page 1 of 14
Free Datasheet http://www.datasheet4u.com/
1 page  
Typical Performance Characteristics
Circuit of Figure 1. TA = 25°C, VIN = VEN = 12V, VOUT = 3.3V unless otherwise specified.
Light Load Operation
Full Load Operation
Vin ripple
0.1V/div
Vo ripple
0.1V/div
VLX
10V/div
2µs/div
Start Up to Full Load
IL
2A/div
Vin
5V/div
2µs/div
Short Circuit Protection
AOZ1053PI
Vin ripple
1V/div
Vo ripple
0.1V/div
VLX
10V/div
IL
5A/div
LVX
10V/div
500µs/div
50% to 100% Load Transient
Vo
2V/div
lin
2A/div
Vo ripple
0.5V/div
Io
2A/div
5ms/div
Short Circuit Recovery
Vo
2V/div
IL
5A/div
VLX
10V/div
Vo
2V/div
IL
5A/div
100µs/div
5ms/div
Rev. 0.4 September 2012
www.aosmd.com
Page 5 of 14
Free Datasheet http://www.datasheet4u.com/
5 Page 
Layout Considerations
The AOZ1053PI is an exposed pad SO-8 package.
Several layout tips are listed for the best electric and
thermal performance.
1. The exposed pad (LX) is connected to the internal
PFET and NFET drains. Connected a large copper
plane to the LX pin to help thermal dissipation.
2. Do not use a thermal relief connection to the VIN pin
or the PGND pin. Pour a maximized copper area to
the PGND pin and the VIN pin to help thermal
dissipation.
3. The input capacitor should be connected as close as
possible to the VIN pin and the PGND pin.
4. A ground plane is preferred. If a ground plane is not
used, separate PGND from AGND and only connect
them at one point to avoid the PGND pin noise
coupling to the AGND pin.
5. Make the current trace from the LX pad 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 away from the LX pad.
AOZ1053PI
Rev. 0.4 September 2012
www.aosmd.com
Page 11 of 14
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AOZ1053PI.PDF ] | |
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