The MP3398H is a step-up controller with four LED current channels, designed to drive WLED arrays for large LCD panel backlighting applications. The MP3398H can expand the number of LED channels with two or more ICs in parallel sharing a single power source.

The MP3398H employs peak current control mode with a fixed switching frequency (f_SW) that is configurable via an external setting resistor. The MP3398H drives an external MOSFET to boost the output voltage (V_OUT) from a 4.5V to 33V input voltage (V_IN) supply. The device also regulates the current in each LED string to the value set by an external current-setting resistor.

The MP3398H applies four internal current sources for current balancing. It achieves 1.5% current matching regulation accuracy between the strings. The low regulation voltage on the LED current sources reduces power loss.

The MP3398H supports direct pulse-width modulation (PWM) dimming mode with a PWM input and analog dimming mode with a PWM input or DC input. Full protection features include over-current protection (OCP), over-temperature protection (OTP), under-voltage protection (UVP), over-voltage protection (OVP), LED short and open protection, and inductor and diode short protection.

The MP3398H is available in an SOIC-16 package.