MP2489 – STEP DOWN WLED DRIVER WITH WIDE 6V–60V INPUT VOLTAGE

MP2489 Rev. 1.23

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4

10/11/2012

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PIN FUNCTIONS

TSOT23-5

Pin#

QFN6

Pin#

SOIC8

Pin#

Name

Description

1

1

1

SW

The Drain of Internal MOSFET. Connecting the common terminal of

inductor and anode of Schottky to this pin.

2

2, 5

2,3,6,7

GND

Ground.

3

3

4

EN/DIM

Enable/Dimming Command Input. To use PWM dimming, apply a square

wave signal to this pin. To use Analog dimming, apply a 0.3V–2.5V DC

voltage to this pin. The voltage from 0.3V to 2.5V linearly controls the

LED current range from 25% to 200%. Turn off the output current when

pulling this pin below 0.2V. Connect a 1nF–10nF capacitor for normal

4

4

5

RS

LED Current Sense Input. Connecting the current sensing resistor that

programs the LED average current to IN pin.

5

6

8

IN

Input Supply Pin. Connecting a proper decoupling capacitor from IN pin

to GND.