MP4688

80V Input, 1A High

Power LED Driver

MP4688 Rev. 1.12

www.MonolithicPower.com

1

3/28/2012

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2012 MPS. All Rights Reserved.

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

APPLICATIONS

• High Power LED Driver

• Automotive, Industry and General Lighting

• Constant Current Source

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