AL8860 Datasheet, PDF (1/17 Pages) Diodes Incorporated – 40V 1.5A BUCK LED DRIVER

AL8860
40V 1.5A BUCK LED DRIVER
Description
The AL8860 is a hysteresis mode DC/DC step-down converter,
designed for driving single or multiple series connected LEDs
efficiently from a voltage source higher than the LED voltage. The
device can operate from an input supply between 4.5V and 40V and
provide an externally adjustable output current up to 1A for TSOT25
package and 1.5A for MSOP-8EP package. Depending upon supply
voltage and external components, this converter can provide up to 40
watts output power.
The AL8860 integrates the power switch and a high-side output
current sensing circuit, which uses an external resistor to set the
nominal average output current.
Dimming can be realized by applying an external control signal to the
CTRL pin. The CTRL pin will accept either a DC voltage signal or a
PWM signal.
The soft-start time can be adjusted by an external capacitor from the
CTRL pin to ground. Applying a voltage of 0.2V or lower to the CTRL
pin can turn off the output and make the device enter into standby
state with low current consumption.
Features
 Low BOM Counts
 Wide Input Voltage Range: 4.5V to 40V
 Output Current Up to 1.5A
 Internal 40V NDMOS Switch
 Typical 5% Output Current Accuracy
 Single Pin for On/Off and Brightness Control by DC Voltage or
PWM Signal
 Recommended Analog Dimming Range: 5% ~100%
 Soft-Start
 High Efficiency (Up to 97%)
 LED Short Protection
 Inherent Open-Circuit LED Protection
 Over Temperature Protection (OTP)
 Up to 1MHz Switching Frequency
 Pb-Free TSOT25 and MSOP-8EP Packages
 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
TSOT25
(Top View)
MSOP-8EP
Applications
 LED Retrofit for Low Voltage Halogen
 Low Voltage Industrial Lighting
 Illuminated Signs
 External Driver with Multiple Channels
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated‟s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AL8860
Document number: DS39014 Rev. 1 - 2
1 of 17
www.diodes.com
September 2016
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