LM3445M/NOPB

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Introduction to LM3445M/NOPB LED Drivers

The LM3445M/NOPB is a multi-mode, 800mA LED driver current regulator that can provide high quality, constant current drive with minimal external part count. This device incorporates a current foldback circuit and can be used to drive up to eight LEDs in series, with a regulated forward current of up to 800mA. It is offered in 2mm x 2mm SOT-23 and 4mm x 3mm DOC packages and has high efficiency, low switch RDS(ON) switching devices, and adjustable currents from 500mA to 800mA.

Applications of LM3445M/NOPB LED Drivers

LM3445M/NOPB LED drivers are used in a wide range of applications such as portable devices, portable medical equipment, handheld communication devices, automotive interior lighting, and other general lighting applications. The LM3445M/NOPB can also be used in industrial and residential applications, due to its high efficiency and small form factor.

Features of LM3445M/NOPB LED Drivers

• ABSOLUTE MAXIMUM RATINGS wide operating temperature range of -40°C to +125°C and 8V to 24V input voltage range.
• Extensive protection including Current Limit Protection, Over Temperature Protection, Thermal Shutdown and Over Voltage Protection.
• Low switch RDS(ON) for increased efficiency and reliability.
• Low shutdown current for reduced power consumption
• High current (800mA) capability

Working principle of LM3445M/NOPB LED Drivers

The LM3445M/NOPB LED driver is a high efficiency, constant current regulator that works with minimal external part count. It uses an inductor to store energy on each switching cycle and supplies that energy to the LED string when the MOSFET is off thereby reducing the number of MOSFET cycles. This device is able to reduce the switched current and switch ON resistance (RDS(on)), resulting in a higher efficiency. The LM3445M/NOPB works in two modes, i.e., Constant Voltage Mode and Constant Current Mode. Depending on the input voltage, the device adjusts the switching frequency and regulates the current to ensure a constant current flow.

In constant-voltage mode, the voltage is regulated to maintain a constant voltage across the LED string. This results in a corresponding variation in the current through the LEDs. In constant-current mode, the voltage is regulated to maintain the current flow which remains constant regardless of the voltage. The LM3445M/NOPB uses an internal charge pump to generate a 13V gate drive for minimized switch RDS(on). This device is able to detect an over-temperature event caused by the current limit protection, causing the device to enter thermal shutdown mode. When a fault condition is detected, the device will stop switching until the fault condition is removed.

Conclusion

The LM3445M/NOPB LED driver is an efficient, single-chip LED current regulator with a low part count. It can be used to provide a constant current drive up to 800mA for up to eight LEDs in series. This device features a wide input voltage range, low switch RDS(on), low shutdown current, and extensive protection features.

The LM3445M/NOPB can be used in a wide range of applications including portable devices, medical equipment, automotive lighting, and general lighting applications. It works by regulating the voltage to maintain a constant voltage or current across the LED string. The device also provides extensive protection features to ensure reliable and efficient operation.

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