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PDF AOZ1018 Data sheet ( Hoja de datos )
| Número de pieza | AOZ1018 | |
| Descripción | EZBuck 2A Simple Regulator | |
| Fabricantes | Alpha and Omega Semiconductors | |
| Logotipo |  |
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AOZ1018
www.DataSheet4U.com
EZBuck™ 2A Simple Regulator
General Description
The AOZ1018 is a high efficiency, simple to use, 2A buck
regulator. The AOZ1018 works from a 4.5V to 16V input
voltage range, and provides up to 2A of continuous
output current with an output voltage adjustable down to
0.8V.
The AOZ1018 comes in SO-8 packages and is rated over
a -40°C to +85°C ambient temperature range.
Features
● 4.5V to 16V operating input voltage range
● 130 mΩ internal PFET switch for high efficiency:
up to 95%
● Internal soft start
● Output voltage adjustable to 0.8V
● 2A continuous output current
● Fixed 500kHz PWM operation
● Cycle-by-cycle current limit
● Short-circuit protection
● Thermal shutdown
● Small size SO-8 packages
Applications
● Point of load dc/dc conversion
● PCIe graphics cards
● Set top boxes
● DVD drives and HDD
● LCD panels
● Cable modems
● Telecom/Networking/Datacom equipment
Typical Application
C1
22µF
Cd
1µF
VIN
From µPC
RC
CC
EN
AOZ1018
COMP
LX
FB
AGND PGND
L1
4.7µH
D1
VOUT
+3.3V Output @ 2A
R1
C2
47µF
R2
Figure 1. 3.3V/2A Buck Regulator
Rev. 1.0 November 2006
www.aosmd.com
Page 1 of 14
1 page  
AOZ1018
Typical Performance Characteristics (Continued)
Circuit of Figure 1. TA = 25°C, VIN = VEN = 12V, VOUT = 3.3V unless otherwise specified.
www.DataSheet4U.com
Short Circuit Protection
Short Circuit Recovery
Vo
2V/div
Vo
2V/div
IL
1A/div
IL
1A/div
100µs/div
100
95
90
85
1ms/div
AOZ1018AI Efficiency
8.0V OUTPUT
5.0V OUTPUT
3.3V OUTPUT
80
75 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Load Current (A)
Note:
3. Thermal de-rating curves for SO-8 package part under typical input and output condition
based on the evaluation board. 25°C ambient temperature and natural convection
(air speed <50LFM) unless otherwise specified.
Derating Curve at 5/6V Input
2.5
1.8V, 3.3V, 5V OUTPUT
2.0
1.5
1.0
0.5
0
25
air speed less than 50lfm
35 45 55 65 75
Ambient Temperature (TA)
85
Derating Curve at 12V Input
2.5
1.8V, 3.3V, 5V, 8V OUTPUT
2.0
1.5
1.0
0.5
0
25
air speed less than 50lfm
35 45 55 65 75
Ambient Temperature (TA)
85
Rev. 1.0 November 2006
www.aosmd.com
Page 5 of 14
5 Page 
AOZ1018
www.DataSheet4U.com
Figure 3. AOZ1018 PCB Layout
1. 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.
2. Input capacitor should be connected to the VIN pin
and the PGND pin as close as possible.
3. 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 cou-
pling to the AGND pin. In this case, put small decou-
pling capacitor to stabilize the input voltage of IC.
4. Make the current trace from LX pin to L to Co to the
PGND as short as possible.
5. Pour copper plane on all unused board area and con-
nect it to stable DC nodes, like VIN, GND or VOUT.
6. The LX pin is connected to internal PFET drain. They
are low resistance thermal conduction path and most
noisy switching node. Connected a copper plane to
LX pin to help thermal dissipation. This copper plane
should not be too larger otherwise switching noise
may be coupled to other part of circuit.
7. Keep sensitive signal trace far away form the LX pin.
Rev. 1.0 November 2006
www.aosmd.com
Page 11 of 14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet AOZ1018.PDF ] | |
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