MP4690
Smart Bypass For
LED Open Protection
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
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
APPLICATIONS
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“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Drain
Control
Circuit
Source
MP4690 Rev. 1.0
7/7/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
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