MP2489 – STEP DOWN WLED DRIVER WITH WIDE 6V–60V INPUT VOLTAGE
MP2489 Rev. 1.23 www.MonolithicPower.com 4
10/11/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
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
operation (V
EN/DIM
=1.28V).
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.
