Power-Leverage Buck-Boost WLED Driver with Separate ADIM and PDIM

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Product 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 LED driver 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, cycle­by­cycle peak current limiting, and thermal shutdown.  The MP4603 is available in SOIC16 package.

Product 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 SOIC16 Package


  • Isw Limit (A)2.5
  • Ishutdown (µA)10
  • Vin (min) (V)4.5
  • Vin (max) (V)80
  • Channels1
  • fsw (min) (kHz)200
  • fsw (max) (kHz)2000
  • Vout (max) (V)80
  • Vfb (V)0.2
  • GradeCatalog
  • Rds(on) (mΩ)500
  • PackageSOIC-16
  • Power MOSFETIntegrated
  • TopologyBuck/Boost
  • Dimming (Output)P-Dim, A-Dim
  • Iq (mA)1.05
  • Typical LCD Screen SizesMedium (10"-29"), Large (30"-45")

Buck-Boost White LED Driver For TV Backlighting Applications

The EV4603-S-00A Evaluation Board is designed to demonstrate the capabilities of MPS’ MP4603ES for TV backlighting applications. MP4603 is an integrated Buck-Boost white LED driver which is suitable for TV and big panel backlighting applications with MPS patented pending technology.

With a 12V input VIN and a high voltage source VINH, EV4603-S-00A can deliver a regulated voltage (VINH to VINH+63V) to drive a LED string over 350V. The LED current is regulated to about 120mA. The EV4603-S-00A can be synchronized. Several EV4603-S-00As can be used together to drive a TV panel.

$25.00 + tax