Monolithic Power Systems MP3378 | Demoboard EV3378-S-00A

Description

The MP3378 is a one-chip solution, speciallydesigned for monitor applications, whichincludes a step-up controller with 4 currentchannels for backlight and a high efficiencybuck converter for internal bus voltage orstandby power.The 4-string WLED controller drives an externalMOSFET to boost up the output voltage fromthe input supply. It regulates the current in eachLED string to the programmed value set by anexternal current setting resistor. It can supportboth analog and PWM dimming independentlyto meet the special dimming mode request. Inaddition, rich protection modes are alsointegrated including OCP, OTP, UVP, OVP,LED short/open protection, inductor/diode shortprotection.The high efficiency buck converter operates inthe current mode operation with built inMOSFET and synchronous rectifier. It offers avery compact solution to achieve excellent loadand line regulation. Full protection featuresinclude OCP and thermal shut down.The MP3378 is available in SOIC28 package.

Features

• WLED Controller:
• 4-String, Max 350mA/String WLEDController-Up to 24V Input Voltage Range-2.5% Current Matching Accuracy-Programmable Switching Frequency-PWM and Analog Dimming Mode-LED Open and Short LED Protection-Programmable Over-Voltage Protection
• Recoverable thermal Shutdown Protection-Over Current Protection-Over Temperature Protection-Inductor/Diode short ProtectionBuck Converter:
• 90mΩ/40mΩ Low Rds(on) Internal PowerMOSFETs
• Low Quiescent Current
• -Fixed 233kHz Switching Frequency
• Frequency Sync from 250kHz to 2MHzExternal Clock

• AAM Power Save Mode

  -Internal Soft Start

  -OCP Protection and Hiccup

  -Over Temperature Protection

  -Output Adjustable from 0.8V

Typical applications

• LCD Monitors

More information

• Datasheet
• IC product information