4-String, Max 350mA/String, Step-Up, White LED Controller with Analog and PWM Dimming

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Product Description

The MP3398D is a step-up controller with four current channels designed to drive WLED arrays for large LCD panel backlighting applications. The MP3398D allows for flexible expansion of the number of LED channels by two or more ICs in parallel sharing a single inductive power source. The MP3398D employs peak-current mode with a fixed switching frequency. The frequency is programmable by an external setting resistor. The MP3398D drives an external MOSFET to boost up the output voltage from a 5V to 28V input supply and can regulate the current in each LED string to the value set by an external current-setting resistor. The MP3398D applies four internal current sources for current balancing. The current matching can achieve 2.5% regulation accuracy between strings. The low regulation voltage on the LED current sources reduces power loss. The MP3398D can support both analog and PWM dimming independently to meet different dimming mode requests. Full protection features include over-current protection (OCP), over-temperature protection (OTP), under-voltage protection (UVP), over-voltage protection (OVP), LED short/open protection, and inductor/diode short protection. The MP3398D is available in SOIC16 and SOIC20 packages.

Product Features

  • 4-String, 350mA/String Max WLED Driver
  • 5V-to-28V Input Voltage Range
  • 2.5% Current Matching Accuracy between Strings
  • Programmable Switching Frequency
  • PWM and Analog Dimming Mode
  • Cascading Capability with a Single Power Source
  • LED Open and Short LED Protection
  • Programmable Over-Voltage Protection (OVP)
  • Recoverable Thermal Shutdown
  • Over-Current Protection (OCP)
  • Inductor/Diode Short Protection
  • Under-Voltage Lockout (UVLO)
  • Available in SOIC16 and SOIC20 Packages


  • Ishutdown (µA)0.01
  • Vin (min) (V)5
  • Vin (max) (V)28
  • Channels4
  • fsw (min) (kHz)100
  • Ichannel (max) (A)0.35
  • LEDx ABS Voltage (V)55
  • fsw (max) (kHz)500
  • GradeCatalog
  • PackageSOIC-16, SOIC-20
  • Power MOSFETExternal
  • TopologyBoost
  • Dimming (Output)P-Dim, A-Dim
  • Iq (mA)1.35
  • Typical LCD Screen SizesMedium (10"-29"), Large (30"-45"), Large+ (>45")
  • Other FeaturesCascade Capability, Inductor Short Protection
Quality Policy, Certificates & Reliability Reports
All MPS parts are lead-free, halogen-free and adhere to the RoHS directive. See Environmental section for details.