Power Corner: Why LED Backlights Are the New Battery Bottleneck in 1S Laptops

What happened

In a Power Corner interview, Jason Ngai, senior product marketing manager at pSemi, discussed the ARC1C0608, an LED backlight driver suited for single-cell (1S) Li-ion laptops that need a high conversion ratio from 2.7 to 5.5 V input to LCD backlight voltage of up to 30 V. According to Ngai, as modern SoCs have become highly efficient in standby, the display has become the dominant power draw, consuming up to 70% of total system power, and it cannot be put into standby—only dimmed or shut off. He explained that LED backlight drivers are boost converters whose efficiency worsens as input voltage falls: a typical 1S LED driver runs around the mid-to-high-80 percent range but drops as low as the mid-60s to mid-70s percent across the battery range (about 4.35 V fully charged down to about 3.2–3.6 V near cutoff). The ARC1C0608 uses a proprietary two-stage architecture combining a boost stage and a charge pump, achieving 95% peak efficiency and high-80s to over 90% efficiency across most of the operating range; in a 3.8-V input, 22–24 V output example, a 3x charge pump lets the boost stage reach only about 8 V. This reduces reliance on the inductor, enabling a low-profile solution with a 1.2-mm chip-size inductor (or 0.6-mm height with only about 1% efficiency loss). Beyond laptops, the IC is also suited for other single-cell display applications such as tablets, VR headsets, drone headlights, and bicycle displays.

Impact and signal

Affected components and suppliers

Source and time

Source: Power Electronics News · 10/15/2026 · View original source