AL8861
40V 1.5A BUCK LED DRIVER
Description
Pin Assignments
The AL8861 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 SOT89-5 and MSOP-8EP packages.
Depending upon supply voltage and external components, this
converter can provide up to 40W of output power.
(Top View)
LX 1
5 VIN
GND 2
VSET 3
The AL8861 integrates the power switch and a high-side output
current sensing circuit, which uses an external resistor to set the
nominal average output current.
4 ISENSE
TSOT25
(Top View)
Dimming can be realized by applying an external control signal to the
VSET pin. The VSET 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
VSET pin to Ground. Applying a voltage of 0.2V or lower to the VSET
pin can turn off the output and make the device enter into standby
state with low current consumption.
LX
1
GND
2
VSET
3
Features
VIN
4
ISENSE
SOT89-5
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% to 100%
Soft-Start
High Efficiency (Up to 97%)
LED Short Protection
Inherent Open-Circuit LED Protection
RS Short Protection
Over Temperature Protection (OTP)
Up to 1MHz Switching Frequency
Pb-Free TSOT25, SOT89-5 and MSOP-8EP Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
For automotive applications requiring specific change
control (i.e. parts qualified to AEC-Q100/101/200, PPAP
capable, and manufactured in IATF 16949 certified
facilities), please contact us or your local Diodes
representative.
https://www.diodes.com/quality/product-definitions/
An Automotive-Compliant Part is Available Under Separate
Datasheet (AL8861Q)
Notes:
5
(Top View)
ISENSE
1
GND
2
8
VIN
7
N/C
EP
GND
3
6
LX
VSET
4
5
LX
MSOP-8EP
Applications
LED Retrofit for Low Voltage Halogen
Low Voltage Industrial Lighting
LED Backlighting
Illuminated Signs
External Driver with Multiple Channels
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
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