MP4690

Smart Bypass For

LED Open Protection

MP4690 Rev. 1.0

www.MonolithicPower.com

1

7/7/2011

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© 2011 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP4690 is a MOSFET based smart bypass

for LED open protection, which provides a current

bypass in the case of a single LED fails and

becomes an open circuit. When the LED heals

itself or is replaced, the MP4690 automatically

resets. This device features very low voltage

drop so that the conduction loss is very small

during the protection. It achieves excellent

thermal performance and energy efficiency.

LED lighting requires high reliability, especially

in applications, such as automobiles, aircrafts,

and streetlights. The MP4690 is used in parallel

with each LED so that when one LED fails,

other LEDs in the same string can still function

normally.

The usage of the MP4690 is not limited to just

LED loads. It can also be used with other loads

where open protection is required.

The MP4690 is typically used with 1W-2W.

LEDs. The device is available in a SOD123

package.

FEATURES

 Simple Two Terminal Device

 Automatic Reset if the LED Heals itself or is

Replaced

 0.22Ω Typical On-state Resistance

 Less than 1µA Off-state Current

 Available in SOD123 Package

APPLICATIONS

 LEDs where Preventive Maintenance is not

Practical

 LED Headlights

 LEDs with high Reliability Requirements

 Crowbar Protection for Open Circuit

Conditions

 Over-voltage Protection for Sensitive

Circuits

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TYPICAL APPLICATION

Control

Circuit

Drain

Source