MP46885

80V Input, 500mA High

Power LED Driver

MP46885 Rev. 1.0

www.MonolithicPower.com

1

7/7/2011

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2011 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP46885 is a high voltage input step-down

switching regulator to deliver a constant current of

up to 0.5A to high power LEDs. It integrates a

high-side high voltage power MOSFET with a

current limit of 1.0A (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 MP46885 is available in 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 with Exposed Pad

Packages

APPLICATIONS

 High Power LED Driver

 Automotive, Industry and General Lighting

 Constant Current Source

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

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

VIN

BST

SW

GND

FB

EN

DIM

V

IN

4.5V to 80V

C

IN

C

BST

V

OUT

R

FB

I

LED

Enable

PWM

L

O

D1