Monolithic Power Systems MP4601

Description

The MP4601 is an integrated white LED driver. It can be applied with MPS patent pending technology to drive up to 60 inch or larger size LCD TV backlighting, in which the LED string voltage can be up to 350V. The noveltechnology can leverage the LED drive power by regulating only small portion of the LED drive voltage. As a result, working together with a fixed high voltage source, a low voltage LED driver can be used to drive the high voltage LED strings with super high power density, high efficiency and low cost due to the low voltage stress, high switching frequency, and smallersize of passive components.MP4601 is a current mode controlled buckboost regulator. With a 12V input VINL and a high voltage source VINH, it can deliver a regulated voltage (VINH to VINH+63V) to drive a LED string with up to 100 LEDs. It can drive anexternal switch, which is in series with the LED string, to achieve over 1:1000 dimming ratio. Analog dimming can be applied in the same time to further improve the dimming ratio. Fault protection includes LED open strings protection, output short circuit protection, cycle-by-cycle peak current limiting, and thermal shutdown.MP4601 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 Switch
• Switching Frequency Synchronization
• Over 1:1000 Dimming Ratio
• Analog and PWM Dimming
• ±5% 200mV Reference Voltage
• 850µA Quiescent Current
• 10µA Shutdown Mode
• Programmable Cycle-by-Cycle Over Current Protection
• Thermal Shutdown Protection
• LED String Open and Short Protection
• FAULT Output for Short LED Protection
• Output Short Circuit Protection
• Available in TSSOP16-EP and SOIC16 Packages

Typical applications

• Large LCD Panels Backlighting
• TV Backlighting

More information

• Datasheet
• IC product information