The MPQ3369 is a step-up converter with six channel current sources. It is designed to drive white LED arrays as backlighting for small- or medium-sized LCD panels.
The device uses peak current mode as its PWM control architecture to regulate the boost converter. Six channel current sources are applied into the LED cathode to adjust the LED brightness. The MPQ3369 regulates the current in each LED string to the value set via an external current-setting resistor, with 2.5% current regulation accuracy between strings.
A low on resistor MOSFET and a low headroom voltage are provided to improve efficiency. The MPQ3669 has a standard I2C digital interface for easy use. The switching frequency can be configured via a resistor, I2C interface, or external clock.
The MPQ3369 provides analog, PWM, and mix dimming modes with a PWM input. The dimming mode can be selected with the I2C interface or the MIX/AD pin. The device also has a phase shift function to eliminate noise during PWM dimming.
Robust protections guarantee safe operation of the device, and include over-current protection (OCP), over-voltage protection (OVP), over-temperature protection (OTP), and LED short and open protection. The MPQ3669 can also be configured to automatically decrease the LED current at high temperatures.
The MPQ3369 is available in a QFN-24 (4mmx4mm) package.