MP3397

The MP3397 is a step-up controller with 4 current channels designed to drive WLED arrays for large-size LCD-panel backlighting applications. The MP3397 is flexible, and can expand the number of LED channels with two or more MP3397s in parallel operating from a single inductive power source. The MP3397 uses current-mode fixed-frequency architecture. An external resistor sets the switching frequency. This signal drives an external MOSFET to boost up the output voltage from 5V to a 28V input supply. The MP3397 regulates the current in each LED string to the programmed value set by an external current-setting resistor. The MP3397 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 and improves efficiency. An external PWM input signal or DC input signal controls PWM dimming. The dimming PWM signal can be generated internally and the dimming frequency is programmed by an external setting capacitor.