MP3388S

Active
4.5V-25Vin, 50Vout, 8-Channel Boost WLED Driver


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Product Description

The MP3388S is a step-up converter with 8 current-source channels designed to drive arrays of white LED for LCD-panel backlighting applications. The MP3388S uses current-mode, fixed-frequency architecture, and users can select a switching frequency of either 625kHz or 1.25MHz. It generates an output voltage up to 50V from a 4.3V-to-25V input supply. The MP3388S independently regulates the current in each LED string set by an external current setting resistor to a user-programmed value. The MP3388S applies an internal current source to each LED string terminal, and can achieve a current balance of 2.5% regulation accuracy between strings. Its low 600mV regulation voltage on LED current sources reduces power loss and improves efficiency. The MP3388S features external PWM dimming or DC-input PWM dimming, which allows for flexible backlight luminance control. The dimming PWM signal can be generated internally, and the dimming frequency is programmed by an external setting capacitor.

Product Features

  • High Efficiency
  • Compact Size
  • 4.3V-to-25V Input Voltage Range
  • 50V Maximum Step-Up Voltage
  • Balanced Driver for 8 WLED Strings
  • 2.5% Current-Matching Accuracy between Strings
  • Selectable Switching Frequency of 625kHz  or 1.25MHz
  • PWM or DC Input-Burst PWM Dimming
  • Programmable Over-Voltage Protection
  • Under-Voltage Lockout
  • Open- and Short-LED Protection
  • Thermal Shutdown
  • Small QFN24 (4mm × 4mm) Package

Parametrics

  • Isw Limit (A)2
  • Ishutdown (µA)2
  • Vin (min) (V)4.5
  • Vin (max) (V)25
  • Channels8
  • fsw (min) (kHz)625
  • Ichannel (max) (A)0.03
  • LEDx ABS Voltage (V)50
  • fsw (max) (kHz)1250
  • Vout (max) (V)50
  • Vfb (V)0.6
  • GradeCatalog
  • Rds(on) (mΩ)180
  • PackageQFN-24 (4x4)
  • Power MOSFETIntegrated
  • TopologyBoost
  • Dimming (Output)P-Dim
  • Iq (mA)1.8
  • Typical LCD Screen SizesMedium (10"-29")
  • Other FeaturesOutput/Input Disconnect