AOZ1084DI Datasheet, PDF (1/12 Pages) Alpha & Omega Semiconductors – 1.2A Buck LED Driver

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
 420mΩ internal 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
FB
GND
L1
2.2µH
LED1
R_S
VOUT
C2
10µF
Figure 1. 1.2A Buck HB LED Driver
Rev. 0.3 April 2012
www.aosmd.com
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