Active production — what it means for the BOM line
The LP8552TLE/NOPB: ROHS3 compliance covers the current regulatory requirement for lead-free assembly in most markets — no exemption ticking needed.
Boost regulator for LED backlight strings
The LP8552TLE/NOPB is a DC-DC boost (step-up) regulator tailored for backlight applications. It integrates the switching FET internally, so the external BOM stays lean — just the inductor, input/output caps, and the LED current-setting resistor. Six independent output channels each handle up to 450 mA, and the boost output can go to 40 V. That voltage headroom lets you stack multiple LEDs per string — a typical 10-LED string at 3 V forward drop needs 30 V plus margin, and the 40 V ceiling covers it with room for the boost diode drop. PWM dimming is built in — the controller accepts a PWM input to modulate the LED current, giving linear brightness control down to low duty cycles without colour shift.
Package and thermal integration
The exposed die paddle underneath must be soldered to a thermal land on the PCB; a 2-layer board with a via array under the paddle keeps the junction below the 85 °C ambient limit. For outdoor signage or automotive cabin applications that see 85 °C ambient, the derating on output current at high temperature needs to be checked against the datasheet curve (not in this summary).
What the peer TLC5940RHBR does — and does not — replace
The TLC5940RHBR is a linear constant-current sink driver with a shift-register interface — it requires an external boost supply to generate the LED voltage. The LP8552TLE/NOPB is a self-contained boost regulator with integrated switch. They share 'backlight' as an application but the topology difference means the LP8552 cannot drop into a TLC5940 layout: the LP8552 needs the boost inductor and output cap, while the TLC5940 needs an external boost converter and a serial data bus.