Silego Announces GFET3 Integrated Power Switches in Wafer Level Chip Scale Packaging

Unlike other load switch products on the market in Wafer Level Chip Scale Package (WLCSP), Silego combines its world-class FET IP and system-level protection features in announcing three new, lowRDSON feature-rich Integrated Power Switches.

thisSilego Technology, a developer of Configurable Mixedsignal Integrated Circuits (CMICs), announced today an extension of its performance-driven GFET3 Integrated Power Switch (IPS) portfolio. Addressing extremely PCB-space-constrained, high-performance applications in tablet PC, smartphones and fitness band markets, these three new WLCSP products cover high-side power control applications from 1 A to 4 A.

For smartphone and fitness band applications, the 0.64 mm2 (0.8 mm x 0.8 mm) SLG59M1730C (33 mΩ/1 A) and the SLG59M1736C (33 mΩ/2.2 A) are low-leakage, self-powered pFET IPSs that can operate from 2.5 V to 5.5 V supply voltages and draw very little supply current. Both products offer low-threshold ON/OFF control, fast output voltage discharge, and a novel, controlled input current profile on startup. Since small form-factor Li-ion batteries exhibit very low amp-hour capacities, the SLG59M1730C/SLG59M1736C’s controlled 16.5 mA inrush current profile on startup prevents Li-ion battery voltage sag when Bluetooth radios or other high current demand operations are enabled. When compared to other 4-ball WLCSPs in the market with fast, fixed output voltage rise times, the magnitude of the inrush current – directly proportional to the load capacitor value – can be quite large. If the resultant inrush current is large enough to cause the Li-ion battery voltage to sag, an inadvertent system reset can result. Thus, the SLG59M1730C/SLG59M1736C’s controlled inrush current attribute prevents unintended system resets from occurring.

For higher-power tablet pc applications, the SLG59M1735C is a 10.5 mΩ/4 A nFET IPS with a full suite of protection features. Powered from 2.5 V to 5.5 V supplies, the input voltage range extends down to 0.9 V to accommodate 1.0 V high-current rails found in FPGA, ASIC, and processor power sequencing applications. The SLG59M1735C feature set includes: ON/OFF control, soft-start control, undervoltage detection, and two-level current-limit protection. When compared to other packaged products in Silego’s GFET3 portfolio with similar features, the 1.5 mm2 SLG59M1735C is a 50% smaller footprint. When compared to other 4 A WLCSP/DFN products in the market with similar protection features, the SLG59M1735C is a 14% to 32% smaller footprint.

Using Silego’s proprietary MOSFET design IP, these highly-reliable integrated protection devices offer world-class nFET and pFET low RDSON performance. Applying Silego’s proprietary CuFET™ technology, the Company’s design engineers deftly craft these products into very-small WLCSP footprints that maximize system-level performance while minimizing thermal gradients in space-constrained, medium-current applications.

Silego’s newest additions to its expanding GFET3 product portfolio include:


Key features included in this new set of high-performance, GFET3 power control products are:

  • High-performance, low RDSON, low-leakage nFET or pFET MOSFETs
  • Built-in, System-level Circuit Protection Features
  • Internally-controlled Inrush Current Profile (SLG59M1730C and SLG59M1736C)
  • Fast VOUT Discharge (SLG59M1730C and SLG59M1736C)
  • External Capacitor-adjustable Output Voltage Slew Rate (SLG59M1735C)
  • Two-level Current-limit Protection (SLG59M1735C)

Targeted applications addressed by these new WLCSP IPSs include:

  • Smartphones
  • Personal Fitness Bands
  • Digital Cameras
  • Handheld GPS Devices
  • Tablet PCs
  • FPGA, ASIC, and Processor Power Sequencing

Please contact Silego’s customer service team at: or visit Silego’s website: for pricing, samples, datasheets, and additional technical information about these new and other high-performance integrated power switches in Silego’s GFET3 and HFET1 product portfolios.

About Silego – The CMIC Company

Silego Technology is a fabless semiconductor company that creates, designs, and sells configurable mixed-signal integrated circuits, or CMICs, leading a paradigm shift in the way that hardware engineers design their systems. The Company’s CMICs integrate analog, digital logic, and mixed-signal circuit blocks into various programmable products that are optimized for specific functions relating to power, timing, or interface. Each product variant of the Company’s CMICs eliminates multiple passive and discrete components that had previously provided such functionality. The Company’s CMICs enable original equipment manufacturers, or OEMs, in high-volume applications to cost-effectively deliver their hardware products to market faster and with greater design flexibility. The Company’s scalable CMIC platform is comprised of its configurable ICs, its proprietary design software, and its development kits. The Company’s solution consists of its proprietary CMIC platform and its delivery model, which includes its interactive design support, rapid prototyping of customer designs and flexible, cost-optimized manufacturing. The Company’s solution provides its customers with various CMICs that are optimized to address power, timing, or interface functions in their systems.

Contact Information


1515 Wyatt Drive
Santa Clara, CA, 95054

tele: 408-327-8800
fax: 408-327-8800

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