AL5802

Document number: DS35516 Rev. 9 - 2

1 of 11

www.diodes.com

March 2014

© Diodes Incorporated

AL5802

30V, ADJUSTABLE CURRENT SINK LINEAR LED DRIVER

Description

The AL5802 combines a high gain NPN transistor with a pre-biased

NPN transistor to make a simple small footprint LED driver.

The LED current is set by an external resistor connected from REXT

pin (6) to GND pin (4), the internal high gain transistor develops

approximately 0.6V across the external resistor.

The AL5802 open-collector output can operate from 0.8V to 30V

enabling it to operate from 5V to 24V power supplies without

additional components.

PWM dimming of the LED current can be achieved by either driving

the BIAS pin (2) with a low impedance voltage source, or driving the

EN pin (3) with an external open-collector NPN transistor or open-

drain N-channel MOSFET.

The AL5802 is available in a SOT26 package and is ideal for driving

20mA to 120mA LED currents.

Features



Reference voltage VRSET = 0.65V



-40 to +125°C temperature range



0.8V to 30V open-collector output



Negative temperature co-efficient – automatically reduces the

LED current at high temperatures



Low thermal impedance SOT26 with copper leadframe



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)



Qualified to AEC-Q101 Standards for High Reliability

Pin Assignments

(Top View)

SOT26

Applications



Linear LED driver



LED signs



Offline LED luminaries

Typical Application Circuit

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.

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