Active production — what it means for the BOM line
The LP8557IAYFQT: ROHS3 compliance is confirmed on the manufacturer's record, so the part clears the material declaration gate without a waiver.
Boost regulator parametrics for backlight arrays
This is a 6-channel DC-DC boost regulator with integrated switches — the internal FET handles the step-up conversion, so no external power transistor is needed on the output stage. Each channel delivers 25 mA continuous, and the total output voltage can go up to 28 V — that combination drives a series string of six to eight white LEDs per channel in a typical backlight panel. PWM dimming is supported directly, which keeps the colour temperature stable across the brightness range — the controller modulates the on-time of the boost switch rather than dropping the current below the LED's rated minimum.
Switching frequency and supply rail fit
The oscillator can be set to either 500 kHz or 1 MHz via an external resistor — 1 MHz shrinks the inductor and output capacitor values for a compact layout, while 500 kHz trades component size for lower switching losses. The operating temperature range is -30°C to 85°C ambient — this covers most indoor and automotive cabin applications but does not reach the full -40°C industrial floor; check the thermal profile against your enclosure's ambient low.
Footprint and board integration
Packaged in a 16-bump DSBGA (0.4 mm pitch wafer-level chip-scale), the LP8557IAYFQT occupies roughly 2.5 mm × 2.0 mm of board area — the small footprint is the trade-off for a stencil-printed solder-paste process and X-ray inspection at assembly.