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MAQ3203

High- Brightness LED Driver Controller

with HighSide Current Sense-

Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 9440800 • fax + 1 (408) 4741000 • San --http://www.micrel.com

April

20, 2015

Revision 1.2

General Description

The MAQ3203 is a hysteretic, stepdown, constant--

current, HighBrightness LED (HB LED) driver. It provides -

an ideal solution for interior/exterior lighting, architectural

and ambient lighting, LED bulbs, and other general

illumination applications.

The MAQ3203 is well suited for lighting applications

requiring a wide-input voltage range. The hysteretic control

gives good supply rejection and fast response during load

transients and PWM dimming. The highside current -

sensing and onchip currentsense amplifier delivers LED --

current with 5% accuracy. An external highside current±- -

sense resistor is used to set the output current.

The MAQ3203 offers a dedicated PWMinput (DIM) which

enables a wide range of pulsed dimming. A high-frequency

switching operation up to 1.5MHz allows the use of smaller

external components minimizing space and cost. The

MAQ3203 offers frequency dither feature for EMI control.

The MAQ3203perates oover a junction temperature from

− °+°40C to 125C 8-and is available in an pin SOIC

p-ackage. The MAQ3203 is AECQ100 qualified for

automotive applications.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

•-AECQ100 qualified

• 4.5V to 42V inputvoltage range

• >High efficiency (90%)

• ±5% LED current accuracy

• Dither enabled for low EMI

•- Highside current sense

• Dedicated dimming control input

• Hysteretic control (no compensation!)

• Up to 1.5MHz switching frequency

• Adjustable constant LED current

•- Overtemperature protection

• −°+°40C to 125C junction temperature range

Applications

• Automotive lighting

• Industrial lighting

Typical Application

MAQ3203 Step- Down LED Driver

Product specificaties