AL8807AEV3

Issue 2 – October 2012

www.diodes.com

© Diodes Incorporated 2012

2

AL8807AEV3 Connection Point Definition

Name

Description

Vin

Positive supply voltage. 6 to 36V

GND

Supply Ground (0V).

CTRL

Internal voltage ref. pin (2.5V). This pin can be used for dimming.

Leave floating for full brightness.

LED A

LED A

connects to the external LED anode

LED K

LED K

connects to the external LED cathode

AL8807A DEVICE DESCRIPTION

The AL8807A is a continuous mode inductive driver in a SOT25 package, for driving one or more

series-connected LEDs efficiently from a voltage source higher than the LED voltage. The device

includes the output switch and a current sense circuit, which requires an external sense resistor to set

the nominal current up to 1A.

AL8807A DEVICE FEATURES

•

Drives one or more series-connected LEDs

•

LEDs up to 1A.

•

Internal 40V switch.

•

Wide input voltage: 6V to 36V.

•

Inherent open circuit LED protection.

•

Brightness control using a DC voltage.

DEVICE APPLICATIONS

•

LED flashlights.

•

High Power LED driving.

•

Low-voltage halogen replacement LEDs.

•

Automotive lighting.

•

Illuminated signs.

AL8807A Device Packages, Pin and Definitions

1

2

3

4

5

6

7

8

GND

CTRL

GND

N.C.

SET

SW

SW

Top View

SOT25 package

MSOP8EP package

AL8807A Device Pin Definition

Name

Pin No

Description

SW

1

Drain of NDMOS switch.

GND

2

Ground (0V).

CTRL

3

Internal voltage ref. pin (2.5V) :

•

Leave floating for normal operation.

•

Drive with DC voltage (0.25V to 2.5V) to adjust output current

SET

4

Connect a sense resistor, R1, from the SET pin to VIN to sense the

VIN

5

Input voltage: 6V to 36V. Decouple to ground with a 2.2uF or higher

ceramic capacitor.