MP4690 Smart Bypass For LED Open Protection The Future of Analog IC Technology DESCRIPTION FEATURES The MP4690 is a MOSFET based smart bypass Simple Two Terminal Device for LED open protection, which provides a current Automatic Reset if the LED Heals itself or is bypass in the case of a single LED fails and Replaced becomes an open circuit. When the LED heals 0.22 Typical On-state Resistance itself or is replaced, the MP4690 automatically Less than 1A Off-state Current resets. This device features very low voltage Available in SOD123 Package drop so that the conduction loss is very small during the protection. It achieves excellent APPLICATIONS thermal performance and energy efficiency. LEDs where Preventive Maintenance is not Practical LED lighting requires high reliability, especially LED Headlights in applications, such as automobiles, aircrafts, LEDs with high Reliability Requirements and streetlights. The MP4690 is used in parallel with each LED so that when one LED fails, Crowbar Protection for Open Circuit other LEDs in the same string can still function Conditions normally. Over-voltage Protection for Sensitive Circuits The usage of the MP4690 is not limited to just LED loads. It can also be used with other loads For MPS green status, please visit MPS website under Quality Assurance. MPS and The Future of Analog IC Technology are Registered Trademarks of where open protection is required. Monolithic Power Systems, Inc. The MP4690 is typically used with 1W-2W. LEDs. The device is available in a SOD123 package. TYPICAL APPLICATION Drain Control Circuit Source MP4690 Rev. 1.0 www.MonolithicPower.com 1 7/7/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2011 MPS. All Rights Reserved. MP4690 SMART BYPASS FOR LED OPEN PROTECTION ORDERING INFORMATION Part Number* Package Top Marking Free Air Temperature (T ) A MP4690GSD SOD123 AAY -40 C to +105 C * For Tape & Reel, add suffix Z (e.g. MP4690GSDZ) For RoHS Compliant Packaging, add suffix LF (e.g. MP4690GSDLFZ) PACKAGE REFERENCE Drain 1 2 Source (4) (1) Thermal Resistance JA JC ABSOLUTE MAXIMUM RATINGS SOD123 ................................. 340 .... 150 .. C/W Drain to Source Voltage ............... -0.3V to +7.5V (2) Continuous Power Dissipation (T =+25 C) A Notes: 1) Exceeding these ratings may damage the device.......................................................... 0.37W 2) The maximum allowable power dissipation is a function of the Junction Temperature ............................... 150 C maximum junction temperature T(MAX), the junction-to- J Lead Temperature .................................... 260 C ambient thermal resistance , and the ambient temperature JA T . The maximum allowable continuous power dissipation at A Storage Temperature ............... -65C to +150 C any ambient temperature is calculated by P (MAX)=(T (MAX)- D J T )/ . Exceeding the maximum allowable power dissipation (3) A JA Recommended Operating Conditions will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry Maximum On-state Current......................... 0.7A protects the device from permanent damage. Maximum Junction Temp. (T ) ............. +125C J 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. MP4690 Rev. 1.0 www.MonolithicPower.com 2 7/7/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2011 MPS. All Rights Reserved.