Obsolete — sourcing through surplus and broker channels
Texas Instruments has marked the LM3503SQ-35/NOPB as Obsolete. RoHS3 compliant per — the part carries the /NOPB suffix indicating lead-free and RoHS-compliant construction.
Boost regulator with integrated switch and dual outputs
A DC-DC step-up (boost) regulator with internal switch rated at 750 mA per channel, driving up to two LED strings at a regulated 35 V output. The 1 MHz switching frequency keeps the external inductor and capacitor small enough for compact backlight assemblies. Supports both analog and PWM dimming — the PWM input allows the host controller to set brightness directly, while the analog control pin adjusts the current sense threshold for a continuous dimming curve.
16-WQFN package — board-fit considerations
Housed in a 16-lead WFQFN with exposed pad (4 mm × 4 mm body). Surface-mount only; no through-hole variant exists. The 0.50 mm pitch QFN footprint demands careful solder-paste stencil design to avoid bridging between the centre pad and the perimeter leads.