MP3378 24 V, 4-Channel WLED Controller Plus High-Efficiency Buck Converter
Description
The MP3378 is a one-chip solution designed for monitor applications. It includes a step-up controller with 4 current channels for backlighting and a high-efficiency buck converter for internal bus voltage or standby power. The 4-string WLED controller drives an external MOSFET to boost up the output voltage from the input supply. It regulates the current in each LED string to the programmed value set by an external current-setting resistor. It supports both analog and PWM dimming independently to meet the special dimming mode request. In addition, rich protection modes are integrated including OCP, OTP, UVP, OVP, LED short/open protection, and inductor/diode short protection. The high-efficiency buck converter operates in current mode with a built in MOSFET and synchronous rectifier. It offers a very compact solution to achieve excellent load and line regulation. Full protection features include OCP and thermal shutdown. The MP3378 is available in SOIC28 and TSSOP28EP package.
Features
WLED Controller:
• 4-String, Max 350 mA/String WLED Controller
• Up to 24 V Input Voltage Range
• 2.5% Current Matching Accuracy
• Programmable Switching Frequency
• PWM and Analog Dimming Mode
• Open and Short LED Protection
• Programmable Over-Voltage Protection
• Recoverable Thermal Shutdown Protection
• Over-Current Protection
• Over-Temperature Protection
• Inductor/Diode Short Protection
Buck Converter:
• 144 mΩ/58 mΩ Low Rds(on) Internal Power
MOSFETs
• Low Quiescent Current
• Fixed 235 kHz Switching Frequency
• Frequency Sync from 250 kHz to 2 MHz
External Clock
• AAM Power-Save Mode
• Internal Soft Start
• OCP and Hiccup
• Over-Temperature Protection
• Output Adjustable from 0.8 V
Applications
• Desktop LCD Flat Panel Displays
• Flat Panel Video Displays
• 2D/3D LCD TVs and Monitors
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