The MP3398D is a step-up controller with four current channels designed to drive WLED arrays for large LCD panel backlighting applications. The MP3398D allows for flexible expansion of the number of LED channels by two or more ICs in parallel sharing a single inductive power source.
The MP3398D employs peak-current mode with a fixed switching frequency. The frequency is programmable by an external setting resistor. The MP3398D drives an external MOSFET to boost up the output voltage from a 5V to 28V input supply and can regulate the current in each LED string to the value set by an external current-setting resistor.
The MP3398D applies four internal current sources for current balancing. The current matching can achieve 2.5% regulation accuracy between strings. The low regulation voltage on the LED current sources reduces power loss.
The MP3398D can support both analog and PWM dimming independently to meet different dimming mode requests. Full protection features include over-current protection (OCP), over-temperature protection (OTP), under-voltage protection (UVP), over-voltage protection (OVP), LED short/open protection, and inductor/diode short protection.
The MP3398D is available in SOIC16 and SOIC20 packages.
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The EV3398A-S-00A is an evaluation board for the MP3398A, a step-up converter designed for liquid-crystal displays that employ an array of LEDs as the light source. It can drive up to four strings of LEDs in parallel with a 350mA/string maximum current. The MP3398A uses current-mode, fixed switching frequency architecture. The frequency is programmable by an external frequency-setting resistor. The device drives an external MOSFET to boost up the output voltage from a 5V to 28V input supply. It regulates the current in each LED string to the programmed value set by an external current-setting resistor.
The MP3398A can support both analog and PWM dimming independently to meet the special dimming mode request. In addition, rich protection modes are integrated, including OCP, OTP, UVP, OVP, LED short/open protection, and inductor/diode short protection.
The MP3398A is available in SOIC-16, TSSOP-16, and SOIC-20 packages.