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Alpha & Omega Semiconductors

AOZ1084 Datasheet Preview

AOZ1084 Datasheet

1.2A Buck LED Driver

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AOZ1084
1.2A Buck LED Driver
General Description
The AOZ1084 is a high efficiency, simple to use, 1.2A
buck HB LED driver optimized for general lighting
applications. The AOZ1084 works from a 4.5V to 36V
input voltage range, and provides up to 1.2A of
continuous LED current. The 160mV LED current
feedback voltage minimizes the power dissipation of the
external sense resistor. The fixed switching frequency of
450kHz PWM operation reduces inductor and capacitor
sizes.
The AOZ1084 is available in a tiny DFN2x2-8L package.
Features
Up to 36V operating input voltage range
420minternal NMOS
Up to 95% efficiency
Internal compensation
1.2A continuous output current
Fixed 450kHz PWM operation
Internal soft start
160mV LED current feedback voltage with ±8%
accuracy
Cycle-by-cycle current limit
Short-circuit protection
Thermal shutdown
Small size DFN2x2-8L
Applications
General LED lighting
Architectural lighting
Signage lighting
Typical Application
VIN
C1
4.7µF
C3
VIN BS
DIM LX
AOZ1084
GND
FB
L1
2.2µH
LED1
RS
VOUT
C2
10µF
Figure 1. 1.2A Buck HB LED Driver
Rev. 0.3 April 2012
www.aosmd.com
Page 1 of 12




Alpha & Omega Semiconductors

AOZ1084 Datasheet Preview

AOZ1084 Datasheet

1.2A Buck LED Driver

No Preview Available !

AOZ1084
Ordering Information
Part Number
AOZ1084DI
Ambient Temperature Range
-40 °C to +85 °C
Package
DFN2x2-8L
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
Please visit www.aosmd.com/media/AOSGreenPolicy.pdf for additional information.
Environmental
Green Product
Pin Configuration
LX
VIN
VIN
DIM
1
2
3
4
8 BST
7 GND
6 GND
5 FB
DFN2x2-8
(Top View)
Pin Description
Pin Number
1
2
Pin Name
LX
VIN
3 VIN
4 DIM
5 FB
6 GND
7 GND
8 BST
Exposed Pad
EPAD
Pin Function
PWM output connection to inductor.
Supply voltage input. Input range from 4.5V to 36V. When VIN rises above the UVLO
threshold the device starts up.
Supply voltage input. Input range from 4.5V to 36V. When VIN rises above the UVLO
threshold the device starts up.
PWM dimming pin. This pin is active high.
LED current feedback. The FB pin regulation voltage is 160mV. Connect an external
sense resistor between the cathode of the LED string and GND to set LED current.
Ground.
Ground.
Bootstrap voltage input. High side driver supply. Connected to 10nF capacitor between
BST and LX.
Thermal exposed pad. Pad cam be connected to GND if necessary for improved thermal
performance.
Rev. 0.3 April 2012
www.aosmd.com
Page 2 of 12


Part Number AOZ1084
Description 1.2A Buck LED Driver
Maker Alpha & Omega Semiconductors
Total Page 12 Pages
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