MOSFETs for lithium battery charging

2 September 2015 Power Electronics / Power Management

The DMN2014LHAB and DMN2011UFX dual N-channel enhancement mode MOSFETs, introduced by Diodes Incorporated, provide a compact, bidirectional low-loss switch for battery charging circuits.

End markets include chargers for portable devices such as smartphones, tablets, cameras and media players, which use 1-cell and 2-cell lithium batteries.

The devices are configured as dual common-drain MOSFETs and, when switched on, they allow bidirectional current flow for charging or operational use. When switched off they protect the battery by preventing over-charging or excessive current drain.

With a 20 V breakdown rating, the DMN2014LHAB and DMN2011UFX also feature low on resistance (less than 13 m and less than 9,5 m respectively) to reduce battery power loss in normal operation. A high maximum peak current up to 80 A allows the switch to briefly handle short circuit conditions before the protection circuitry kicks in, while a gate threshold voltage below 1 V ensures correct operation even with drive voltages as low as 1,8 V.

The DMN2014LHAB is available in the 2 x 3 mm DFN2030 package and the DMN2011UFX is offered in the 2 x 5 mm DFN2050, providing small form-factor solutions that allow designers to use the space saved for additional cells and increase the battery’s mAh capacity.

For more information contact Erich Nast, Avnet South Africa, +27 (0)11 319 8600, erich.nast@avnet.eu, www.avnet.co.za

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