MP2489

Step Down White LED Driver with

MP2489 Rev. 1.23

www.MonolithicPower.com

1

10/11/2012

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© 2012 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP2489 is a high efficiency step-down

converter designed in continuous current mode

for driving the high brightness Light Emitting

Diodes (LED) from wide input voltage 6V–60V.

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 202mV

average feedback voltage reduces power loss

and improves the converter efficiency.

The MP2489 implements PWM and analog

dimming together with DIM pin.

The

MP2489

includes

thermal

overload

protection preventing damage in the event of an

output overload.

The MP2489 is available in small QFN6 (3x

3mm), TSOT23-5 and SOIC8E packages.

FEATURES

• Internal 65V MOSFET

• Wide 6V to 60V Input Range

• ≥1A Output Current

• High Efficiency (>95%)

• Hysteresis Control

• PWM & Analog Dimming

• 1000:1 PWM Dimming Resolution

• Thermal Shutdown

• Inherent Open LED Protection

• Short LED Protection

• Available in TSOT23-5, QFN6(3x 3mm) and

SOIC8E Packages

APPLICATIONS

• Low Voltage Halogen Replacement

• Low Voltage General Illumination

• Automotive/Decorative LED Lighting

• Signs/Emergency Lighting

• LED Backlighting

All MPS parts are lead-free and adhere to the RoHS directive. For MPS green

status, please visit MPS website under Quality Assurance. “MPS” and “The

Future of Analog IC Technology” are Registered Trademarks of Monolithic

Power Systems, Inc.

TYPICAL APPLICATION

D1

L1

IN

RS

SW

EN/DIM

GND

MP2489