Bi-directional battery switch saves 91% PCB space over discrete MOSFETs

Combining industry-low on-resistance and ultra-low quiescent current in a compact, 12-bump WCSP package, Digi-Key now stocks the Vishay SiP32101 bi-directional battery switch. In smart phones, tablets, digital cameras, portable healthcare meters, data storage systems, and more, PCB space is at a premium. In these products, discrete MOSFET solutions for battery isolation utilize three components and typically occupy 26mm2. The SiP32101 has a footprint of only 2.3mm2, saving valuable space and lowering the overall component count to simplify designs. In addition, the device has an active-low enable pin that can interface with low-voltage GPIOs directly, eliminating the need for extra level shifting circuitry or higher-voltage gate drivers. An integrated pull-down resistor on the EN pin prevents spurious turn-on in low-power states where the GPIO may be left floating. The SiP32101's low 6.5mohm on-resistance at 3.3V reduces power losses and increases efficiency. Combined with a wide 2.3V to 5.5V input voltage range and a soft turn-on time of 2ms to minimize inrush current, it is the ideal device for high-capacity battery applications and high-current load switching. The load switch consumes very low currents in both on and off states. It uses a mere 0.015nA quiescent current and 0.01nA shutdown current, ensuring that the battery will not drain quickly if the device is left idle for a long period of time. Operating over a temperature range of -40C to +85C, the battery load switch released today is RoHS-compliant, halogen-free, and available in a 1.3mm by 1.7mm by 0.55mm WCSP package saving around 91% PCB space over discrete MOSFETs.