Protect 1- & 2-cell lithium batteries while charging
Offering a compact, bi-directional low-loss switch for battery-charging circuits, the DMN2014LHAB and DMN2011UFX dual N-channel enhancement mode MOSFETs have been introduced by Diodes Incorporated. The devices are designed for use in chargers for portable devices such as smartphones, tablets, cameras and media players, which use 1- and 2-cell lithium batteries.
The DMN2014LHAB and DMN2011UFX are configured as dual common-drain MOSFETs and, when switched on, these devices allow bi-directional current flow for charging or operational use. When switched off they protect the battery by preventing over-charging or excessive current drain. With a 20V breakdown rating, the DMN2014LHAB and DMN2011UFX also feature low on resistance of less than 13 and 9.5mΩ, respectively, to reduce battery power loss in normal operation.
A high maximum peak current up to 80A allows the switch to briefly handle short-circuit conditions before the protection circuitry kicks in, while a gate threshold voltage of under 1V ensures correct operation even with drive voltages as low as 1.8V.
The DMN2014LHAB is available in the tiny 2x3mm DFN2030 package and the DMN2011UFX is offered in the 2x5mm DFN2050, providing small form-factor solutions that allow designers to use the space saved for additional cells and increase the battery’s mAh capacity.
The DMN2014LHAB and DMN2011UFX MOSFETs are priced at $0.17 and $0.25 each, respectively, in 3,000 unit quantities.
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