PWM dimming and output topology
The LP8552TLE-E04/NOPB: Dimming is handled via PWM, the standard interface for LED backlight controllers — the PWM duty cycle sets the average current through each string while the boost stage maintains a constant voltage headroom. Six independent current sinks allow per-string current matching, critical for uniform panel brightness across the full dimming range. The 450 mA per-channel rating supports parallel LED configurations where each string draws up to that current; total output power is limited by the boost converter's input power budget and thermal dissipation in the 25-DSBGA package.
Package and board integration — 25-DSBGA
The 25-bump DSBGA is a wafer-level chip-scale package with a 0.4 mm pitch typical for this bump count. The small footprint — roughly 2.2 mm × 2.2 mm — saves board area but demands a controlled reflow profile and X-ray inspection after assembly to confirm solder-joint integrity under each bump.
Compliance and documentation
Texas Instruments lists the LP8552TLE-E04/NOPB as ROHS3 compliant, meeting the EU RoHS exemption framework without conflict.