The Future of Analog IC Technology
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
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
Smart Bypass For
LED Open Protection
Simple Two Terminal Device
Automatic Reset if the LED Heals itself or is
0.22Ω Typical On-state Resistance
Less than 1µA Off-state Current
Available in SOD123 Package
LEDs where Preventive Maintenance is not
LEDs with high Reliability Requirements
Crowbar Protection for Open Circuit
Over-voltage Protection for Sensitive
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MP4690 Rev. 1.0
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