Offline High Brightness
White LED Driver Controller
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.
Constant-current LED Driver
Power MOSFET Zero-Current Turn On
No Freewheeling Diode Reverse Recovery
High Efficiency and Reliability in Boundary
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
DC/DC or AC/DC LED Driver applications
Automotive/ Decorative LED Lighting
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Monolithic Power Systems, Inc.
MP4000 Rev. 1.3
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