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PDF AOZ3017 Data sheet ( Hoja de datos )
| Número de pieza | AOZ3017 | |
| Descripción | 4A Synchronous Buck Regulator | |
| Fabricantes | ALPHA & OMEGA | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AOZ3017 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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AOZ3017
EZBuck™ 4 A Synchronous Buck Regulator
General Description
The AOZ3017 is a high efficiency, simple to use, 4 A
synchronous buck regulator. The AOZ3017 operates
from a 4.5 V to 18 V input voltage range, and provides up
to 4 A of continuous output current with an output voltage
adjustable down to 0.8 V.
The AOZ3017 comes in an exposed pad SO-8 package
and is rated over a -40 °C to +85 °C operating ambient
temperature range.
Features
4.5 V to 18 V operating input voltage range
55 mΩ internal high-side switch and 20 mΩ internal
low-side switch (at 12 V)
Up to 95 % efficiency
External soft start
Output voltage adjustable to 0.8 V
4 A continuous output current
500 kHz 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
AOZ3017 LX
COMP
FB
AGND
PGND
L1 4.7µH
R1
R2
VOUT
C2, C3
22µF
Rev. 0.4 August 2012
Figure 1. 3.3 V, 4 A Synchronous Buck Regulator, Fs = 500 kHz
www.aosmd.com
Page 1 of 14
1 page  
Typical Performance Characteristics
Circuit of Figure 1. TA = 25 °C, VIN = VEN = 12 V, VOUT = 3.3 V unless otherwise specified.
Light Load Operation
Full Load Operation
Vin ripple
0.2V/div
Vo ripple
0.2V/div
VLX
10V/div
2µs/div
Start Up to Full Load
IL
2A/div
Vin
5V/div
2µs/div
Short Circuit Protection
Vo
2V/div
Io
2A/div
1ms/div
50% to 100% Load Transient
10ms/div
Short Circuit Recovery
100µs/div
Vo ripple
0.2V/div
Io
2A/div
10ms/div
AOZ3017
Vin ripple
1V/div
Vo ripple
0.2V/div
VLX
10V/div
IL
5A/div
Vo
2V/div
VLX
10V/div
IL
5A/div
Vo
2V/div
VLX
10V/div
IL
5A/div
Rev. 0.4 August 2012
www.aosmd.com
Page 5 of 14
5 Page 
Layout Considerations
The AOZ3017 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.
AOZ3017
Rev. 0.4 August 2012
www.aosmd.com
Page 11 of 14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AOZ3017.PDF ] | |
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