The MP3398T is a step-up controller with four current channels, designed to drive WLED arrays for large-size LCD panel backlighting applications. It is able to expand the number of LED channels with two or more ICs in parallel sharing a single power source. The MP3398T uses peak current mode with a fixed switching frequency. The frequency is programmable through an external setting resistor. The MP3398T drives an external MOSFET to boost up the output voltage from a 4.5V to 33V input supply. It regulates the current in each LED string to the value set by an external current-setting resistor.

The device applies four internal current sources for current balance. The current matching can achieve 2% regulation accuracy between strings. Its low-regulation voltage on LED current sources reduces power loss. The MP3398T supports direct PWM dimming.

In addition, it integrates rich protection modes including OCP, OTP, UVP, OVP, LED short/open protection, and inductor/diode short protection.

The MP3398T is available in a TSSOP-16EP package.