MP4689

100V Input, 1A High

Power LED Driver

MP4689 Rev. 1.0

www.MonolithicPower.com

1

4/29/2011

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

© 2011 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP4689 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 2.5A (typical value). The wide

4.5V to 100V input range accommodates a

variety of step-down applications, making it

ideal for automotive, industrial 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 ±3%

accuracy.

The switching frequency is up to 1MHz, 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 MP4689 is available in SOIC8 with

exposed pad packages.

FEATURES

• Wide 4.5V to 100V Operating Input Range

• No Output Capacitor Required

• ±3% LED Current Accuracy

• Hysteretic Control: No Compensation

• Up to 1MHz 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 with Exposed Pad

Packages

APPLICATIONS

• High Power LED Driver

• Automotive, Industry and General Lighting

• Constant Current Source

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“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

PWM

DIM

EN

FB

GND

SW

BST

VIN

D1

Enable

4.5V to 100V