Microchip MAQ3203YM Manual

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Side 1/23

MAQ3203

High- Brightness LED Driver Controller

with High Side Current Sense-

Micrel Inc. • 2180 Fortune Drive • Jose, CA 95131 • USA • tel +1 (408) 944 0800 • fax + 1 (408) 474 1000 • San - - http://www.micrel.com

April

20, 2015

Revision 1.2

General Description

The MAQ3203 is a hysteretic, step down, constant- -

current, High Brightness 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 high side current -

sensing and on chip current sense amplifier delivers LED - -

current with 5% accuracy. An external high side current±- -

sense resistor is used to set the output current.

The MAQ3203 offers a dedicated PWM input (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 MAQ3203 perates o over a junction temperature from

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

p -ackage. The MAQ3203 is AEC Q100 qualified for

automotive applications.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

• -AEC Q100 qualified

• 4.5V to 42V input voltage range

• > High efficiency ( 90%)

• ± 5% LED current accuracy

• Dither enabled for low EMI

• - High side current sense

• Dedicated dimming control input

• Hysteretic control (no compensation!)

• Up to 1.5MHz switching frequency

• Adjustable constant LED current

• - Over temperature protection

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

Applications

• Automotive lighting

• Industrial lighting

Typical Application

MAQ3203 Step- Down LED Driver

Micrel, Inc.

MAQ3203

April

20, 2015 2 Revision 1.2

Ordering Information

Part Number

( )1

Marking Junction Temperature Range Package PWM

MAQ3203YM MAQ3203YM − +40°C to 125°C 8-Pin SOIC Dither

Note:

1. YM is a GREEN RoHS- compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.

Pin Conguration

8-Pin ( SOIC M)

(Top View)

Pin Description

Pin Number Pin Name Pin Function

1 VCC

Voltage Regulator Output. The V

CC pin supplies the power to the internal circuitry. The VCC is the

output of a linear regulator which is powered from VIN. A 1µF ceramic capacitor is recommended for

bypassing and should be placed as close as possible to the VCC and AGND pins. Do not connect to

an external load.

2 CS Current-Sense Input. The CS pin provides the high side current sense to set the LED current with an -

external sense resistor.

3 VIN

Input Power Supply. VIN is the input supply pin to the internal circuitry and the positive input to the

current sense comparator. Due to the high frequency switching noise, a 10µF ceramic capacitor is

recommended to be placed as close as possible to VIN and the power ground (PGND) pin for

bypassing. Please refer to layout recommendations.

4 AGND Ground pin for analog circuitry. Internal signal ground for all low power sections.

5 EN

Enable Input. The EN pin provides a logic level control of the output and the voltage has to be 2.0V or

higher to enable the current regulator. The output stage is gated by the DIM pin. When the EN pin is

pulled low, the regulator goes to off state and the supply current of the device is greatly reduced

(below 1µA). In the off state, during this period the output drive is placed in a "tri-stated" condition,

where MOSFET is in an “off” or non conducting state. Do not drive the EN pin above the supply -

voltage.

6 DIM

PWM Dimming Input. The DIM pin provides the control for brightness of the LED. A PWM input can

be used to control the brightness of LED. DIM high enables the output and its voltage has to be at

least 2.0V or higher. DIM low disables the output, regardless of EN “high” state.

7 PGND

Power Ground Pin for Power FET. Power Ground (PGND) is for the high-current switching with

hysteretic mode. The current loop for the power ground should be as small as possible and separate

from the Analog ground (AGND) loop. Refer to the layout considerations for more details.

8 DRV

Gate-Drive Output. Connect to the gate of an external N channel MOSFET. The drain of the external -

MOSFET connects directly to the inductor and provides the switching current necessary to operate in

hysteretic mode. Due to the high frequency switching and high voltage associated with this pin, the

switch node should be routed away from sensitive nodes.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MAQ3203YM

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