AL8807

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER

AL8807

Document number: DS35281 Rev. 4 - 2

2 of 21

www.diodes.com

June 2012

© Diodes Incorporated

Pin Descriptions

Pin Name

Pin Number

Descriptions

SOT25

MSOP-8EP

SW

1

5, 6

Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to

reduce EMI.

GND

2

2, 3

GND Pin

CTRL

3

4

Dimming and On/Off Control Input.

•

Leave floating for normal operation.

•

Drive to voltage below 0.4V to turn off output current

•

•

A PWM signal (low level

≤ 0.4V and high level > 2.6; transition times less than 1us)

allows the output current to be adjusted below the level set by the resistor connected

to SET input pin.

SET

4

1

Set Nominal Output Current Pin. Configure the output current of the device.

5

8

Input Supply Pin. Must be locally decoupled to GND with > 2.2µF X7R ceramic capacitor –

see applications section for more information.

EP

-

EP

Exposed pad/TAB connect to GND and thermal mass for enhanced thermal impedance.

Should not be used as electrical ground conduction path.

N/C

-

7

no connection

Absolute Maximum Ratings

Symbol

Parameter

Ratings

Unit

ESD HBM

Human Body Model ESD Protection

2.5

kV

ESD MM

Machine Model ESD Protection

200

V

-0.3~40

V

SW voltage relative to GND

-0.3~40

V

CTRL pin input voltage

-0.3 ~ 6

V

DC or RMS Switch current

SOT25

1.25

A

MSOP-8EP

1.6

Peak Switch current (<10%)

2.5

A

Junction Temperature

150

°C

Lead Temperature Soldering

300

°C

Storage Temperature Range

-65 to +150

°C

Caution:

Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only;

functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may

be affected by exposure to absolute maximum rating conditions for extended periods of time.

Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when

handling and transporting these devices.

Recommended Operating Conditions

Symbol

Parameter

Min

Max

Unit

Operating Input Voltage relative to GND

6.0

36

V

Voltage High for PWM dimming relative to GND

2.6

5.5

V

Voltage range for 20% to 100% DC dimming relative to GND

0.5

2.5

V

Voltage Low for PWM dimming relative to GND

0

0.4

V

Maximum switching frequency

1

MHz

Continuous switch current

SOT25

1

A

MSOP-8EP

1.3

Junction Temperature Range

-40

125

°C