4-Channel Boost WLED Controller with OCP Latch Off Protection

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Product Description

The MP3398B is a step-up controller with 4 current channels, which is designed to drive WLED arrays for large-size LCD-panel backlighting applications. It is flexible to expand the number of LED channels by two or more ICs in parallel sharing a single inductive power source. The MP3398B uses peak-current mode with fixed switching frequency. The frequency is programmable by an external setting resistor. The MP3398B drives an external MOSFET to boost up the output voltage from a 5V to 28V input supply. It regulates the current in each LED string to the value set by an external current-setting resistor. The MP3398B applies 4 internal current sources for current balance. The current matching can achieve 2.5% regulation accuracy between strings. Its low regulation voltage on LED current sources reduces power loss. The MP3398B can support both analog and PWM dimming independently to meet the different dimming-mode request. In addition, rich protection modes are also integrated including OCP, OTP, UVP, OVP, LED short/open protection, inductor/diode short protection. The MP3398B is available in a TSSOP16-EP package.

Product Features

  • 4-String, Max 350mA/String 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
  • Recoverable Thermal Shutdown Protection
  • Latch-off Over Current Protection
  • Inductor/Diode short Protection
  • Under-Voltage Lockout
  • TSSOP16-EP Package


  • 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
  • PackageTSSOP16 EP
  • 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, Inductor Short Protection