Texas Instruments has marked the LM3502SQ-35 as Obsolete.
Boost LED driver with integrated switch
The LM3502SQ-35 is a DC-DC boost regulator designed for backlight applications. It integrates the power switch internally, delivering up to 35 V output with a 750 mA switch current limit. The 1 MHz switching frequency allows the use of small external inductors and capacitors, keeping the total solution footprint compact. PWM dimming is supported, giving the system designer direct control over LED brightness without varying the DC output level — the PWM signal modulates the on-time of the switch, and the downstream LC filter averages the current to the LED string.
Two independent outputs are available, allowing the driver to control two separate LED strings or channels with a common boost stage.
RoHS compliance note
This is a critical check for designs targeting RoHS exemption-free markets or where the BOM must pass a restricted-substance audit. If RoHS compliance is mandatory, a functionally equivalent alternative in a compliant package should be evaluated at the board level.