Monolithic Power Systems MP3398A

Description

The MP3398A 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 MP3398A uses peak-current mode with fixed switching frequency. The frequency is programmable by an external setting resistor. The MP3398A drives an external MOSFET to boost up the output voltage from a 5V to 28Vinput supply. It regulates the current in each LED string to the value set by an external current-setting resistor.The MP3398A 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 MP3398A 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 MP3398A is available in SOIC16, TSSOP16-EP and SOIC20 packages.

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
• Over Current Protection
• Inductor/Diode short Protection
• Under-Voltage Lockout
• SOIC16, TSSOP16-EP and SOIC20Packages

Typical applications

• Flat Panel Video Displays
• 2D/3D LCD TVs and Monitors
• Desktop LCD Flat Panel Displays

More information

• Datasheet
• IC product information