AOZ1081 Datasheet PDF - Alpha & Omega Semiconductors
| Part Number | AOZ1081 | |
| Description | 1.8A High Efficiency Constant Current Regulator | |
| Manufacturers | Alpha & Omega Semiconductors | |
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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 mΩ internal 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.
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Page 1 of 16
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AOZ1081
Electrical Characteristics
TA = 25°C, VIN = VEN = 12V, VOUT = 3.3V unless otherwise specified(3)
Symbol
Parameter
Conditions
Min. Typ. Max.
VIN
VUVLO
IIN
Supply Voltage
Input Under-Voltage Lockout
Threshold
Supply Current (Quiescent)
VIN Rising
VIN Falling
IOUT = 0, VCOMP = 0.1V, VEN
>1.2V
4.5 16
4.0
3.7
23
IOFF Shutdown Supply Current
VFB Feedback Voltage
Load Regulation
VEN = 0V
1 10
0.2375 0.25 0.2625
0.5
Line Regulation
0.5
IFB Feedback Voltage Input Current
VEN EN Input Threshold
Off Threshold
On Threshold
200
0.6
2.0
VHYS
EN Input Hysteresis
MODULATOR
100
fO
DMAX
DMIN
Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Error Amplifier Voltage Gain
850 1000 1150
100
12
500
Error Amplifier Transconductance
200
PROTECTION
ILIM Current Limit
VPR Output Over-Voltage Protection
Threshold
Off Threshold
On Threshold
2.5 4.0
330
240
TJ Over-Temperature Shutdown Limit
tSS Soft Start Interval
OUTPUT STAGE
150
400
High-Side Switch On-Resistance
VIN = 12V
VIN = 5V
97 130
166 200
Note:
3. Specification in BOLD indicate an ambient temperature range of -40°C to +85°C. These specifications are guaranteed by design.
Units
V
V
mA
µA
V
%
%
nA
V
mV
kHz
%
%
V/ V
µA / V
A
mV
°C
µs
mΩ
Rev. 1.1 April 2009
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for AOZ1081 electronic component. |
| Information | Total 16 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ AOZ1081.PDF Datasheet ] | |
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