LM3502SQX-16/NOPB

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The LM3502SQX-16/NOPB is a LED driver power management integrated circuit. It is a type of PMIC solution specifically designed for LED applications. Due to its small size and its low power consumption, it is often used in low power LED applications, such as portable electronic devices, automotive lighting or handheld electronics.

Benefits and Features

The LM3502SQX-16/NOPB provides a number of benefits and features, including:

• 1.9mΩ RDS(ON) sync FET - lower conduction losses.
• High efficiency - up to 94% for the LED driver.
• User selectable digital dimming.
• Integrated soft-start and over-voltage protection.
• Wide input voltage range (4.0V to 32V).
• Adaptive on-time and burst mode operation.
• Output is dimmable from 0-100%.
• Thermal shutdown protection and under-voltage lockout.

The LM3502SQX-16/NOPB is a high-performance and efficient LED driver that offers several unique features, such as user-selectable digital dimming, integrated soft-start and over-voltage protection, and adaptive on-time and burst mode operation.

Applications

The LM3502SQX-16/NOPB is ideally suited for low power LED applications in consumer, portable and automotive electronics, such as interior/exterior/emergency lighting, switches and indicators, large display indicators, and small lighting fixtures. The device is small enough to be used in handheld electronics, such as mobile phones and PDAs.

Working Principle

The LM3502SQX-16/NOPB uses pulse-width modulation (PWM) for controlling the brightness of LEDs. The output voltage of the device is regulated through the PWM switching of a high-side and low-side switch. The integrated 400 kHz oscillator and a reference voltage are also used in the regulation of the output voltage. The duty cycle of the PWM signal is adjustable, providing a dimming range from 0-100%.

The device operates in one of three different modes: high-side PWM mode, low-side PWM mode, and sleep mode. In high-side PWM mode, the output voltage is regulated through the PWM switching of the high-side switch. In low-side PWM mode, the output voltage is regulated through the PWM switching of the low-side switch. Finally, in sleep mode, the device is in a low-power state, reducing power consumption to less than 10µA.

The LM3502SQX-16/NOPB also features integrated soft-start and over-voltage protection. The soft-start feature allows the device to gradually ramp-up the output voltage, preventing a sudden surge in current. The over-voltage protection prevents the output voltage from going beyond a certain level, thus protecting the LEDs from possible damage.

The device also features thermal shutdown and under-voltage lockout protection. The thermal shutdown prevents the device from overheating, thus prolonging its life. The under-voltage lockout prevents the device from operating when the input voltage is too low.

Conclusion

The LM3502SQX-16/NOPB is a high-performance and efficient LED driver. It is a type of PMIC solution specifically designed for low power LED applications. It provides high efficiency, user-selectable digital dimming, integrated soft-start, over-voltage protection, and several other features. The device is small and has low power consumption, making it ideal for handheld electronics such as mobile phones and PDAs. It can also be used in other applications such as interior/exterior/emergency lighting, switches and indicators, large display indicators, and small lighting fixtures.

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