MPQ3387L Datasheet | Monolithic Power Systems

DESCRIPTION The MPQ3387L is a step-up converter with 6channel current sources. It is designed for driving the white LED arrays as backlighting of middle or large size LCD panel. The MPQ3387L uses peak-current mode as its PWM control architecture. The switching frequency can be programmed by a resistor. It generates an output voltage up to 45V from a 3V to 25V input supply. The MPQ3387L independently regulates the current in each LED string to the value set by an external current-setting resistor. The MPQ3387L applies 6 internal current sources in each LED string terminal to achieve a current balance with 3% current regulation accuracy between strings. Its low 500m V regulation voltage on LED current sources reduces power loss. The MPQ3387L features external digital PWM dimming and analog dimming, both of which sharing a single input with 25% PWM duty cycle as a transfer point. The mix-dimming strategy helps to improve the dimming ratio. Also, MPQ3387L automatically transfers the PWM input signal 100Hz to 20k Hz frequency to 24k Hz to 27.5k Hz to eliminate the audible noise. MPQ3387L has rich protection modes to guarantee safety operation. The protection modes include recoverable OCP (over-current protection), OVP (over-voltage protection), OTP (over-temperature protection), any string of LED short and open protection. The MPQ3387L is available in TQFN244mm X4mm package. FEATURES - Guaranteed Industrial/Automotive Temperature Range Limits - 6-String, Max 45m A/String - 3V to 25V Input Voltage Range - 3% Current Matching Accuracy Between Strings - Programmable Switching Frequency - Selectable bined Analog and PWM Dimming Mode or Pure PWM Dimming Mode - bined Analog and PWM Dimming Mode with 25% Dimming Transfer Point - 24k Hz to 27.5k Hz Output Dimming Frequency to eliminate audible noise - Cascading Capability with a Single Power Source - Programmable Over-Voltage Protection - Recoverable Thermal Shutdown Protection - Cycle by Cycle Over Current Protection - Fault...