MP3352DQ-LF-Z

MP3352DQ-LF-Z application field and working principle

The MP3352DQ-LF-Z is a high efficiency, low noise, and low quiescent current step-down DC-DC converter belonging to a family of PMIC - LED Drivers. It features a 1.5A switch with internal compensation, a current sense, over-temperature protection, and thermal shutdown. The MP3352DQ-LF-Z is specially designed to drive LED lighting applications. It is suitable for driving high performance, high power LED applications with standard 1.5A operating current.

Application Field

The MP3352DQ-LF-Z is mainly used in LCD backlighting and automotive lighting applications due to its excellent performance. This regulator can be used in various LED drive applications, such as street lamps, car headlights, LED backlighting, emergency lighting, landscape lighting, building lighting, LED ribbon strips, and LED Bulbs. The LED Driver is also ideal for LED sign applications and LED decorative lighting applications.

Working Principle

The MP3352DQ-LF-Z is a buck-type DC-DC converter. It converts a high input voltage to a lower output voltage to provide a highly efficient current limiting advantage. An adaptive constant frequency peak current control algorithm accurately compensates for inductor current over the entire PWM switching cycle, resulting in a switch duty cycle that is virtually independent of input voltage, inductor value, and led current. The high side current sense detects current flowing through the inductor or other discharge current. When the inductor current reaches a predetermined current limit value, the PWM output will quickly switch to low, reducing the output current. The PWM output stays off until the sense voltage drops below a hysteresis voltage and the cycle is repeated.

The MP3352DQ\'s built-in over-temperature protection circuit shuts down the converter when the operating temperature limit is exceeded. In addition, the MP3352DQ has a low quiescent current that is desirable in many automotive applications. It operates from an input voltage of > 3.9V and provides an output voltage of fixed 0.7V, allowing for the sets of LEDs to be accurately brought to the same output voltage regardless of input voltage.

The MP3352DQ-LF-Z has multiple features that make it a good choice for LED lighting applications. It has an adjustable switching frequency that can be set up to 500KHz, allowing LED lights to be operated at higher efficiency levels. The high side current sense has an impressive size to precision ratio of 0.45%. It also offers over-temperature protection against thermal overload, ensuring stability and reliability. Finally, its high efficiency helps to reduce heat dissipation and extend system runtime.

In conclusion, the MP3352DQ-LF-Z is an ideal choice for a DC-DC converter in high power LED lighting applications. It boasts excellent performance, with a high side current sense that limits dangerous current overshoot, adjustable switching frequency to increase system efficiency, and over-temperature protection to ensure system stability. With its low quiescent current and high efficiency, this converter is a great choice for both cost-sensitive and long-running LED lighting applications.