Chip power inductors suit deployment in power circuits of portables

October 14, 2014 // By Graham Prophet
ALPS Green Devices has developed the “GLCLK Series” and “GLCLM Series” Liqualloy Power Inductors, suitable for power supply circuits of displays for smartphones and other compact mobile devices, such as tablets and digital cameras.

Compact mobile devices are expected to consume more and more electricity as their displays become larger and their CPUs faster. Inductors and other electronic components making up the power supply circuits for devices need to have low power loss and accommodate size and thickness reductions.

The GLCLK Series and GLCLM Series were created using original powder compacting and moulding technology and after altering the composition of the Liqualloy material used for earlier ALPS Green Devices products. This enabled around three times better frequency characteristics than earlier products and supports the use of switched mode power supplies with higher frequencies. The products also achieve a core loss reduction of around 70% compared to earlier products (when measured at 3 MHz) and therefore perform highly efficiently in power supply circuits with high ripple current ratios, particularly those used in display power supplies.

As chip type components, electrodes of the GLCLK Series and GLCLM Series are located on the base, which is useful for achieving low height. Because there are no electrodes located on the top of the power inductors, noise suppression components or other parts can be installed in close proximity to them. This improves flexibility in end product design.

Liqualloy, the inductors' core material, is an original magnetic amorphous alloy developed by ALPS. It is potentiall an alternative magnetic material to use in place of the most common core material, ferrite, and the second most common, iron powder.

GLCLK Series:

  1. Dimensions (W x D x H): 2.5 x 2.0 x 1.0 mm;
  2. Inductance: 0.47 – 4.7 µH;
  3. DC resistance: 31 - 230 mΩ;
  4. GLCLM Series;
  5. Dimensions (W x D x H): 2.5 x 2.0 x 1.2 mm;
  6. Inductance: 0.47 – 4.7 µH;
  7. DC resistance: 26 - 185 mΩ.