High-side load switch improves reliability

30-10-2019 | Diodes Inc | Connectors, Switches & EMECH

Diodes Incorporated has introduced the AP22913, a 2A single-channel, slew-rate-controlled load switch featuring true reverse current blocking for high-side load-switching applications.


These switches offer a useful way of applying or removing power to a load, especially to removable peripherals powered through a USB port. The large output capacitors (100µF) linked with the USB port and self-powered USB peripherals produce the chance that the load switch may become reverse-biased, which produces the potential of reverse current running from the load to the source, possibly causing damage to other components or active cables. The load switch includes TRCB, which eliminates the normal body diode unwanted current paths to give a cost-effective and space-efficient solution to load switching.


With a load current of up to 2A across a broad operating voltage range, the device is intended to provide a typical RDS(ON) of 92mOhm at 1.5V and 54mOhm at 5V, enabling maximum load current handling capacity with a low forward voltage drop. The turn-on slew rate of the switch is managed internally to give a soft-start feature for sensitive loads while the device also provides an active-high enable input to facilitate load switching. To secure TRCB when disabled and in its off state, the VIN and VOUT terminals are fully isolated internally.


The load switch is intended to run from 1.4V to 5.5V and uses a quiescent current of just 1µA, making it ideal for 1.8V, 2.5V, 3.3V, and 5V systems. With a maximum load current of 2A, the switch is ideal for a broad range of applications, including smart phones, portable, wearable and medical devices, and navigation devices as well as notebooks and ultra-mobile PCs.

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