LM3503SQ-35/NOPB

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Part Status:	Obsolete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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LM3503SQ-35/NOPB PMIC - LED Drivers

The LM3503SQ-35/NOPB is a high performance, low cost, monolithic 3-channel constant current linear LED driver suitable for a variety of LED applications including backlighting for LCDs, lighting general illumination, gaming, and interior decoration.

Application Field

The LM3503SQ-35/NOPB is ideal for applications requiring maximum flexibility in order to maximize LED lifetime and color fidelity. The adjustable output current allows for precise LED brightness control and a wide range of LED configurations. Additional features include thermal foldback, built-in hot-plug protection, and a wide operating temperature range.The LM3503SQ-35/NOPB is suitable for use with a variety of LEDs, including white LEDs and decorative lighting. As a three channel monolithic device, it is ideal for driving multiple LCD backlight strings in a variety of LCD display applications. It is also suitable for driving up to three strings of LEDs in gaming, general illumination, and interior decoration applications.

Working Principle

The LM3503SQ-35/NOPB incorporates a proprietary current regulation architecture that allows for up to three channels of highly linear current regulation. Each channel has its own independent current setting register, and each channel’s output is controlled by a linear outer loop that alters the output current based on the the regulated voltage.The device features built-in protection features that include thermal foldback, open load protection, and a hot-plug protection circuit. If an overdrain condition is detected, the device will automatically reduce the output current toa safe level.The device also features a low power sleep mode that can be entered to reduce power consumption when not in use. To minimize EMI issues, a spread spectrum modulation scheme is implemented to reduce peak current.

Conclusion

The LM3503SQ-35/NOPB is a highly integrated and cost-effective 3-channel constant current LED driver that is suitable for a variety of applications including LCD backlighting, general illumination, gaming, and interior decoration. Its adjustable output current and wide operating temperature range make it an ideal choice for applications requiring maximum flexibility and LED lifetime. The device features built-in protection features which, coupled with a low power sleep mode and spread spectrum modulation scheme, ensure maximum reliability and performance.

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