MP4603 White LED Driver for Large LCD TV Backlights The Future of Analog IC Technology DESCRIPTION FEATURES The MP4603 is an integrated white LED driver. Novel Power-Leverage-Control Technology It uses MPSs patent-pending technology to Unique Step-Up/Down Operation drive the backlights for LCD TVs measuring 60- Up to 99.5% Efficiency inches or larger, for LED string voltages up to 0.5 Internal Power MOSFET 350V. This novel technology can leverage the Switching Frequency Synchronization LED drive power by regulating only a small Over 1:1000 Dimming Ratio portion of the LED drive voltagetogether with Separate Analog and PWM Dimming a fixed high-voltage source, a low-voltage LED 5% 200mV Reference Voltage driver can drive high voltage LED strings. This 10 A Shutdown Mode method allows for a super-high power density, Cycle-by-Cycle Over-Current Protection higher efficiency and lower cost due to the low Thermal Shutdown Protection voltage stress, higher switching frequencies, LED String Open and Short Protection and smaller passive components. FAULT Output at LED Protection The MP4603 is a current-modecontrolled Output Short-Circuit Protection buck-boost regulator. With a 12V input V and INL Available in SOIC16 Package a high voltage source V , it can deliver a INH regulated voltage (V to V +68V) to drive a INH INH APPLICATIONS LED string with up to 100 LEDs. It can drive an Large LCD Panels Backlighting external switch in series with the LED string to High Power Street LED Lighting achieve over 1:1000 dimming ratio. Analog dimming can be applied at the same time to All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. further improve the dimming ratio. Fault MPS and The Future of Analog IC Technology are registered trademarks of protections include LED open-string protection, Monolithic Power Systems, Inc. output short-circuit protection, cycle-by-cycle peak current limiting, and thermal shutdown. The MP4603 is available in SOIC16 package. MP4603 Rev. 1.01 www.MonolithicPower.com 1 7/16/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2015 MPS. All Rights Reserved.MP4603 MP4603 WHITE LED DRIVER FOR LARGE LCD TV BACKLIGHTS TYPICAL APPLICATION V INH MP4603 Fault FAULT BST R FAULT 100K C BST L1 100n VIN VIN SW C IN R1 INGND VSS CLK/SYN SYN DGD C OUT PWM PWM OVP EN EN FB R FB ADIM ADIM COMP R2 C COMP FST SLOPE 10n R FST 300K R SLOPE 300K MP4603 Rev. 1.01 www.MonolithicPower.com 2 7/16/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2015 MPS. All Rights Reserved.MP4603