MP3388S

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



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产品描述

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.

产品特性

  • 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

技术参数

  • Isw Limit (A)2
  • Ishutdown (µA)2
  • 最小输入电压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