Monolithic Power Systems MP4603

Description

The MP4603 is an integrated white LED driver. It uses MPS’s patent-pending technology to drive the backlights for LCD TVs measuring 60- inches or larger, for LED string voltages up to 350V. This novel technology can leverage the LED drive power by regulating only a small portion of the LED drive voltage—together with a fixed high-voltage source, a low-voltage LEDdriver can drive high voltage LED strings. This method allows for a super-high power density, higher efficiency and lower cost due to the low voltage stress, higher switching frequencies, and smaller passive components.The MP4603 is a current-mode–controlled buck-boost regulator. With a 12V input VINL and a high voltage source VINH, it can deliver a regulated voltage (VINH to VINH+68V) to drive a LED string with up to 100 LEDs. It can drive an external switch in series with the LED string to achieve over 1:1000 dimming ratio. Analog dimming can be applied at the same time to further improve the dimming ratio. Fault protections include LED open-string protection, output short-circuit protection, cycle-by-cycle peak current limiting, and thermal shutdown.The MP4603 is available in TSSOP16-EP and SOIC16 packages.

Features

• Novel Power-Leverage-Control Technology
• Unique Step-Up/Down Operation
• Up to 99.5% Efficiency
• 0.5Ω Internal Power MOSFET
• Switching Frequency Synchronization
• Over 1:1000 Dimming Ratio
• Separate Analog and PWM Dimming
• ±5% 200mV Reference Voltage
• 10μA Shutdown Mode
• Cycle-by-Cycle Over-Current Protection
• Thermal Shutdown Protection
• LED String Open and Short Protection
• FAULT Output at LED Protection
• Output Short-Circuit Protection
• Available in TSSOP16-EP and SOIC16 Packages

Typical applications

• Large LCD Panels Backlighting
• High Power Street LED Lighting

More information

• Datasheet
• IC product information