LM3503SQ-35

Voltage - Output:	35V
Base Part Number:	LM3503
Supplier Device Package:	16-WQFN (4x4)
Package / Case:	16-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Applications:	Backlight
Dimming:	Analog, PWM
Frequency:	1MHz
Current - Output / Channel:	750mA (Switch)
Series:	--
Voltage - Supply (Max):	5.5V
Voltage - Supply (Min):	2.5V
Number of Outputs:	2
Internal Switch(s):	Yes
Topology:	Step-Up (Boost)
Type:	DC DC Regulator
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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PMIC- LED Drivers: LM3503SQ-35 application field and working principle

The LM3503SQ-35 is flexible and advanced light emitting diode (LED) driver. It is a 3-MHz, fixed-frequency, constant-current/constant- voltge, high-efficiency step-down driver that operates from a 4 V to 40 V input and can be used to drive up to 4 LEDs in series from 3 V up to 40 V. The LM3503SQ-35 incorporates numerous configurable protection and dimming modes that can extend the life of an LED system with minimal effort.The LM3503SQ-35 is suitable for a wide range of low power LED applications, from portable devices to industrial lighting systems. It is well-suited for powering general lighting circuits, such as solid-state lamps, downlights, and other lighting applications. It can also be used in automotive headlights, floods, and other automotive illumination. The LM3503SQ-35 is available in a low profile, low cost, 16-pin QFN package.

Operating Principle

The LM3503SQ-35 uses a fixed frequency current mode control scheme combined with a low resistance internal power switch. It operates in open loop, meaning it can control a regulated output voltage and current independently. The LED current is monitored and regulated by sensing the voltage across a resistor placed in series between the power switch and the LED. It has a frequency fold back feature, which reduces the switching frequency when an over-current fault is detected, improving power efficiency and the longevity of the circuit.The LM3503SQ-35 incorporates analog, or digital dimming, allowing for many different dimming functions including pulse width modulation (PWM), resistor dimming, and analog dimming. The dimming mode is selected via programmed pin or jumper settings.The LM3503SQ-35 incorporates several configurable protection modes, including over-temperature, over-voltage, over-current, and short circuit protection. These protection settings help reduce risks associated with system failure, providing improved reliability and robustness.The LM3503SQ-35 has several features that improve EMI performance. It includes ripple cancellation circuits and a low EMI, high efficiency spread spectrum mode to reduce conducted and radiated emissions to compatible levels.

Application Field

The LM3503SQ-35 is suitable for a wide range of LED lighting applications, ranging from portable devices to industrial and automotive systems. It is especially well-suited for applications requiring high efficiency, low EMI, and precise LED current control, such as solid-state lamps, downlights, automotive headlights, and floods.It can also be used in switching supplies, battery-operated devices, and portable power tools. The LM3503SQ-35 is especially useful for automotive HID headlight systems, as the protection circuits and dimming functions improve the system’s robustness and reliability.

Conclusion

The LM3503SQ-35 is a robust and flexible LED driver, ideal for applications requiring high efficiency, low EMI, and precise LED current control. The protection circuits and dimming functions combine to make a reliable and safe LED driver for a wide range of lighting applications.

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