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Alpha & Omega Semiconductors

AOZ1081 Datasheet Preview

AOZ1081 Datasheet

1.8A High Efficiency Constant Current Regulator

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AOZ1081
EZBuck™ 1.8A High Efficiency
Constant Current Regulator for LEDs
General Description
The AOZ1081 is a high efficiency, simple to use, 1.8A
buck regulator for White LED. The AOZ1081 works from
a 4.5V to 16V input voltage range, and provides up to
1.8A of continuous output current with an output voltage
adjustable down to 0.25V.
The AOZ1081 comes in an SO-8 package and is rated
over a -40°C to +85°C ambient temperature range.
Features
4.5V to 16V operating input voltage range
100 minternal PFET switch for high efficiency:
up to 95%
Internal Schottky Diode
Internal soft start
0.25V internal reference with ±5% accuracy over
temperature
1.8A continuous output current
Fixed 1MHz PWM operation
Cycle-by-cycle current limit
Short-circuit protection
Under voltage lockout
Output over voltage protection
Thermal shutdown
Small size SO-8 package
Applications
Buck regulator for white LEDs
Landscape lighting
Flashlights
Battery powered backlight applications
Typical Application
VIN
C1
22µF
R1
C2
VIN
EN
AOZ1081
COMP
LX
FB
AGND PGND
4.7µH
HB
LED
RFB
VOUT
C3
22µF
Rev. 1.1 April 2009
Figure 1.
www.aosmd.com
Page 1 of 16




Alpha & Omega Semiconductors

AOZ1081 Datasheet Preview

AOZ1081 Datasheet

1.8A High Efficiency Constant Current Regulator

No Preview Available !

AOZ1081
VIN
C1
22µF
VIN
EN
AOZ1081 LX
4.7µH
COMP
R1 FB
C2 AGND PGND
VOUT
C3
22µF
RFB R2 R3 R4 R5 R6 R7 R8
Figure 2.
Ordering Information
Part Number
AOZ1081AI
Ambient Temperature Range
-40°C to +85°C
Package
SO-8
Environmental
RoHS
All AOS products are offered in packages with Pb-free plating and compliant to RoHS standards.
Please visit www.aosmd.com/web/quality/rohs_compliant.jsp for additional information.
Rev. 1.1 April 2009
www.aosmd.com
Page 2 of 16


Part Number AOZ1081
Description 1.8A High Efficiency Constant Current Regulator
Maker Alpha & Omega Semiconductors
Total Page 16 Pages
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