MP4688
80V Input, 1A High
Power LED Driver
The Future of Analog IC Technology
DESCRIPTION
The MP4688 is a high voltage input step-down
switching regulator to deliver a constant current of
up to 1A to high power LEDs. It integrates a high-
side high voltage power MOSFET with a current
limit of 3.2A (typical value). The wide 4.5V to 80V
input range accommodates a variety of step-down
applications, making it ideal for automotive,
industry and general lighting applications.
Hysteresis current mode control is applied for
very fast response, which makes the 20kHz
dimming frequency possible. MPS’s proprietary
feedback control scheme minimizes the number
of external components while delivering a LED
current with typical ±5% accuracy.
The switching frequency is up to 2MHz, thus
allowing for small component size. The thermal
shut down, short circuit protection, and optional
output voltage limitation provide reliable, fault
tolerant operations. A 170µA quiescent current
allows its use in battery-powered applications.
The MP4688 is available in SOIC8 and SOIC8
with exposed pad packages.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Wide 4.5V to 80V Operating Input Range
No Output Capacitor Required
±5% LED Current Accuracy
Hysteretic Control: No Compensation
Up to 2MHz Switching Frequency
Up to 20kHz Dimming Frequency
Dedicated PWM Dimming Control Input
Short circuit protection with integrated high
side MOSFET
Optional Output Voltage Limitation
Thermal shut down
200mV reference voltage for high efficiency
Up to 95% Efficiency
170μA Quiescent Current
Available in SOIC8 and SOIC8 with
Exposed Pad Packages
High Power LED Driver
Automotive, Industry and General Lighting
Constant Current Source
APPLICATIONS
•
•
•
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
MP4688 Rev. 1.12
3/28/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
MPS [ MONOLITHIC POWER SYSTEMS ]
