Power Electronics
Bi-Directional Battery Switch In WCSP Saves PCB Space Over Discrete MOSFET

Bi-Directional Battery Switch In WCSP Saves PCB Space Over Discrete MOSFET

Vishay Intertechnology, Inc. introduced a 6.5 mΩ bidirectional battery switch with slew rate control for low-voltage battery isolation in portable electronics, healthcare devices, and instrumentation. Designed to save 91 % PCB space compared to using discrete MOSFETs in these space-constrained applications, the Vishay Siliconix  SiP32101 combines industry-low on-resistance and ultra-low quiescent current in a compact 12-bump WCSP package.

In smartphones, 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 26 mm². The SiP32101 has a footprint of only 2.3 mm², 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 6.5 mΩ on-resistance at 3.3 V reduces power losses and increases efficiency. Combined with a wide 2.3 V to 5.5 V input voltage range and a soft turn-on time of 2 ms 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 0.015 nA quiescent current and 0.01 nA shutdown current, ensuring that the battery won't drain quickly if the device is left idle for a long period of time.

Operating over a temperature range of -40 °C to +85 °C, the battery load switch released today is RoHS-compliant, halogen-free, and available in a 1.3 mm by 1.7 mm by 0.55 mm WCSP package.

Samples and production quantities of the SiP32101 are available now, with lead times of 10 weeks for large orders. Pricing for U.S. delivery only starts at $0.93 per piece in 1,000-piece quantities.

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