Power

Load switches combine FET IP with low RDS ON

8th March 2017
Caroline Hayes
0

Three GFET3 Integrated Power Switches (IPS) devices for smartphones, wearables and tablet PCs have been announced by Silego Technology, based on its FET IP technology.

The GFET3 Integrated Power Switches (IPS) are provided in a WLCSP (wafer level chip scale packaging) and cover high-side power control applications from 1.0 to 4.0A.


The 0.64mm2 (0.8 x 0.8mm) SLG59M1730C (33mΩ/1.0A) and the SLG59M1736C (33mΩ/2.2 A) are low-leakage, self-powered pFET IPSs that can operate from 2.5 to 5.5V supply voltages. Both offer low-threshold on/off control, fast output voltage discharge, and a controlled input current profile on start-up. Small form-factor Li-Ion batteries exhibit very low amp-hour capacities, says the company, explaining why the SLG59M1730C and SLG59M1736C's controlled 16.5mA in-rush current profile on start-up prevents Li-ion battery voltage sag when Bluetooth radios or other high current-demand operations are enabled. When compared to other four-ball WLCSPs in the market with fast, fixed output voltage rise times, the magnitude of the in-rush current, which is directly proportional to the load capacitor value, can be quite large. If the in-rush current is large enough to cause the Li-Ion battery voltage to sag, it can cause an inadvertent system reset. The SLG59M1730C and SLG59M1736C's controlled in-rush current attribute prevents unintended system resets from occurring, says the company.


For higher-power tablet PC applications, the SLG59M1735C is a 10.5mΩ/4.0A nFET IPS. It is powered from 2.5 to 5.5V supplies, the input voltage range extends down to 0.9V to accommodate 1.0V high-current rails found in FPGA, ASIC, and processor power sequencing applications. The SLG59M1735C includes on/off control, soft-start control, under-voltage detection, and two-level current-limit protection.
According to the company, its 1.5mm2 SLG59M1735C is a 50% smaller footprint than other packaged products in its GFET3 portfolio, with similar features. Compared with other 4.0A WLCSP/DFN products with similar protection features, the SLG59M1735C’s footprint is 14 to 32% smaller.

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