Boost LED driver with three independent channels
The TI LM3699YFQR is a three-channel DC-DC boost regulator for backlight and camera flash LED applications. It integrates the switching FET internally. Each channel delivers up to 20.2 mA, dimming via PWM. Supply range is 2.7 V to 5.5 V. Switching at 1 MHz keeps external components small.
Temperature grade and package — what they mean for the build
The LM3699YFQR is rated for -40°C to 125°C junction temperature, which puts it in the industrial-to-automotive range. That covers outdoor telecom, engine-bay-adjacent modules, and factory-floor HMI backlights without a derating step. The package is a 12-bump DSBGA (1.64 mm × 1.24 mm) — a fine-pitch wafer-level chip-scale package. That means the PCB landing pattern is tiny, but assembly requires a solder-paste stencil with good aperture alignment and a reflow profile matched to the lead-free finish. The DSBGA has no leads to inspect visually; X-ray or electrical test verifies the joints.
Lifecycle and sourcing posture
The LM3699YFQR carries an active lifecycle status and is ROHS3 compliant. For BOM planning, that means no LTB risk and no forced redesign horizon. The part is quoted to order — no minimum-buy obligation for engineering samples, and volume pricing scales with quantity.