EV2489DQ-00A
Step-Down White LED Driver
Evaluation Board
EV2489DQ-00A Rev.1.01 www.MonolithicPower.com 1
7/21/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The EV2489DQ-00A is an evaluation board for
the MP2489DQ, a step-down converter
designed in continuous current mode for driving
the high brightness light emitting diodes (LEDs)
from wide input voltage 8V-36V. If higher input
voltage (up to 60V) is required, use B190
instead of B140 in D1-D5.
The MP2489 employs hysteretic control
architecture to regulate a high accuracy LED
current, which is measured through an external
high-side current sensing resistor. Moreover,
this control scheme provides optimized circuit
stabilization and very quick response time
without the loop compensation. Its low 200mV
average feedback voltage reduces power loss
and improves the converter efficiency.
The MP2489 implements PWM and Analog
Dimming with DIM pin. The MP2489 includes
under-voltage lockout function, thermal
overload protection preventing damage in the
event of an output overload.
ELECTRICAL SPECIFICATIONS
Parameter Symbol Value Units
Input Voltage V
IN
8 –36 V
Output
Voltage
Vout <Vin-3V
LED Current I
LED
350 mA
FEATURES
Internal 65V MOSFET
Wide 8V to 60V Input Range
High Efficiency (Up to 97%)
Hysteretic Control
PWM & Analog Dimming
1000:1 PWM Dimming Resolution
UVLO, Thermal Shutdown
APPLICATIONS
Low Voltage Halogen Replacement
Low Voltage General Illumination
Automotive/Decorative LED Lighting
Signs/Emergency Lighting
LED Backlighting
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Monolithic Power Systems, Inc.
EV2489DQ-00A EVALUATION BOARD
(2x 1.4 x 1) cm xcm x cm
Board Number MPS IC Number
EV2489DQ-00A MP2489DQ
