MP3376A

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8-Channel, Synchronous, Boost, WLED Driver with I2C Interface



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Product Description

The MP3376A is a synchronous boost converter with eight current channels designed to drive WLED arrays for LCD panels in tablets and notebook backlighting applications. 
The MP3376A uses peak-current-mode and pulse-width modulation (PWM) control to maintain boost converter regulation. The MP3376A employs a standard I2C digital interface to set the operation mode, switching frequency, full-scale current for each channel, sync or non-sync mode, dimming mode and duty, and various protection thresholds.
The MP3376A features high efficiency due to low-headroom voltage for LED regulation and a small on resistance of the switching MOSFET. The synchronous rectifier saves PCB size and total BOM cost. 
The MP3376A is available in a QFN-24 (4mmx4mm) package.

Product Features

  • 8 Channels with Max 50mA/Channel
  • Synchronous Converter with LS-FET/HS-FET 160m/260mΩ On Resistance
  • 3V to 30V Input Voltage Range
  • Up to 37.5V Output Voltage
  • 520mV LED Regulation Voltage at 20mA
  • Max 2.5% Current Matching
  • 350kHz / 500kHz / 650kHz / 800kHz / 950kHz / 1.2MHz / 1.8MHz / 2.4MHz Selectable Switching Frequency
  • A0, A1 Pins for Four I2C Addresses
  • 0mA to 50mA Full-Scale LED Current, 8-Bit, 0.196mA/Step
  • Selectable Sync or Non-Sync Mode
  • Multi-Dimming Operation Mode Including:
    • Analog Dimming through External PWM Input, 10-Bit Resolution
    • Analog Dimming through I2C Interface, 10-Bit Resolution
    • Mixed Dimming Mode through External PWM Input with 6.25% / 12.5% / 25% / 50% Transfer Point
    • Mixed Dimming Mode through I2C interface with 6.25% / 12.5% / 25% / 50% Transfer Point
  • Customizable Default Register Values
  • Linear Smooth Dimming with 2 / 4 / 8 / 16 / 32 / 64 / 128µs Step-Slope Set
  • Unused LED String Auto-Disable during Start-Up
  • LED Short/Open, OTP, OCP, Inductor or Diode Short Protection
    • 2.5 / 5 / 7.5 / 10V LED Short Threshold
    • 24 / 31 / 37.5V OVP Threshold
    • 1.8 / 2.5A Current Limit
  • Available in a QFN-24 (4mmx4mm) Package

Parametrics

  • Isw Limit (A)2.5
  • Ishutdown (µA)1
  • Vin (min) (V)2.7
  • Vin (max) (V)30
  • Channels8
  • fsw (min) (kHz)350
  • Ichannel (max) (A)0.05
  • LEDx ABS Voltage (V)40
  • fsw (max) (kHz)2400
  • Vout (max) (V)37.5
  • Vfb (V)0.4
  • GradeCatalog
  • 封装QFN-24 (4x4)
  • Power MOSFETIntegrated
  • TopologyBoost
  • Dimming (Output)P-Dim, A-Dim, Smart-Dim
  • Iq (mA)5.4
  • Typical LCD Screen SizesSmall (<10"), Medium (10"-29")
  • Other FeaturesI2C, Inductor or Diode Short and Vout short to GND Protection, LED Short/Open