MP4000

Offline High Brightness

White LED Driver Controller

MP4000 Rev. 1.3

www.MonolithicPower.com

1

11/7/2012

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© 2012 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP4000 is a high efficiency step-down

converter designed for driving high brightness

Light Emitting Diodes (LEDs).

The MP4000 drives an external MOSFET in the

floating buck converter structure. The inductor

current is regulated with boundary conduction

mode which features no reverse recovery loss

in the freewheeling diode and soft turn on for

the power MOSFET. Such operation mode can

achieve very high efficiency and at the same

time minimize the inductor value and size. Also,

the LED current can be well regulated by

controlling the MOSFET peak current, which is

sensed through an external resistor. Its low

300mV feedback voltage reduces power loss

and improves efficiency.

The MP4000 can accept an external PWM or a

DC signal for the burst dimming control.

The MP4000 features output short protection,

maximum switching frequency limit, under-

voltage lockout and thermal shut down.

FEATURES

• Constant-current LED Driver

• Power MOSFET Zero-Current Turn On

• No Freewheeling Diode Reverse Recovery

Issues

• High Efficiency and Reliability in Boundary

Mode Operation

• Low 0.9mA Operation Current

• PWM or DC Input Burst Dimming Control

• Hiccup Short Circuit Protection

• UVLO, Thermal Shutdown

• Maximum Frequency is Limited to 110kHz

• Available in SOIC8 Package

APPLICATIONS

• DC/DC or AC/DC LED Driver applications

• General Illumination

• Industrial Lighting

• Automotive/ Decorative LED Lighting

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Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP4000

Rsense

AC input

LEDs

Cout

D

L

GND

CS

DRIVE

BOS

VCC

Cin

C1

MOSFET

DIM

DIM

S1

Vsupply

+

-

Vout

+

-

Vsw

Cbos

Z1

D

R1