AL8860
40V 1.5A BUCK LED DRIVER
Description
Pin Assignments
(Top View)
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.
TSOT25
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.
(Top View)
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.
EP
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.
MSOP-8EP
Applications
Features
LED Retrofit for Low Voltage Halogen
Low BOM Counts
Low Voltage Industrial Lighting
Illuminated Signs
Wide Input Voltage Range: 4.5V to 40V
Output Current Up to 1.5A
External Driver with Multiple Channels
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)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ 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.
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www.diodes.com
July 2018
© Diodes Incorporated
AL8860
Document number: DS39014 Rev. 4 - 2