USB‑C’s Growing Role in Power Management for Wearables and Mobile Devices

Energy consumption remains a top hurdle for mobile technology. While USB‑C was initially conceived as a data‑centric connector, it is now a preferred power‑management solution in portable devices.

As smartphones, wearables, fitness trackers, tablets, and laptops grow more intelligent, their power budgets expand. Even with aggressive battery‑saving techniques, many of these devices deplete within a few hours of full‑power use, forcing users to seek a charger again. Designers therefore must accurately estimate energy needs and engineer highly efficient power‑management circuits.

In a wireless‑charging architecture, the required charging power is a critical parameter. The power received depends on transmitted power, distance, coupling between the transmit and receive windings, and the tolerances of both coils. Fast charging is a key differentiator in the consumer‑electronics market, so manufacturers relentlessly pursue shorter recharge times.

USB‑C delivers rapid recharging, ultra‑fast data transfer, and supports audio‑video output via HDMI, VGA, and DisplayPort. It is rapidly becoming the industry standard for a wide range of devices.

However, this convenience comes at a cost for designers: creating a USB‑Type‑C connector that is compatible, reversible, and fully interoperable with all existing ports presents significant engineering challenges.

Figure 1: SM58IP04 single‑chip

Silicon Mitus offers four product families that cater to mobile electronics, LCD/OLED displays, and charging accessories. Their portfolio includes power‑management ICs (PMICs) for smartphone battery and quick‑charging solutions, complete USB‑Type‑C modules, wireless chargers, display‑specific PMICs, and audio products such as Class‑D amplifiers and high‑performance codecs.

“We have shipped over 3.5 billion ICs across these markets,” says Youm Huh, CEO of Silicon Mitus, a Seoul‑based analog‑IC specialist. “We are also expanding into automotive PMICs and infotainment audio modules, including power management for rear‑view camera systems that replace glass mirrors.”

Silicon Mitus recently launched the SM58IP04: a single‑chip buck‑boost USB‑Type‑C narrow‑V_DC (NVDC) charger designed for 2S/3S and 4S battery configurations. It delivers up to 95 % efficiency in both buck and boost modes, enabling battery charging currents up to 6 A thanks to advanced thermal control.

“The SM58IP04 has seen rapid adoption in computing, delivering outstanding performance with a compact PCB footprint and cost savings,” notes Gianfranco Scherini, VP of Business Development. “It combines multi‑cell battery charging with full USB‑Type‑C and PD support.”

The USB‑Type‑C standard meets market demands for power delivery and high data rates while offering a reversible connector. USB‑Type‑C Power Delivery (PD) supports currents up to 5 A at 20 V, delivering up to 100 W of power—ideal for laptops and high‑performance peripherals. Proper protection is essential to avoid damage at these levels.

“Our focus on high‑efficiency buck‑boost topology and aggressive integration has paid off,” says Scherini. “Customers value a single solution that handles the USB‑Type‑C power path and battery charging. With the SM58IP04, every USB‑Type‑C port behaves identically, providing design flexibility across form factors. The PD 3.0 spec unlocks the ability to negotiate arbitrary voltage‑current combinations, paving the way for up to 100 W of power.”

Thermal management remains the biggest barrier to energy‑saving designs. Advances in device performance raise the stakes for heat dissipation. For semiconductor manufacturers, packaging quality determines thermal dissipation and overall system reliability.

“Thermal management is crucial, especially as consumers demand slimmer, fan‑less laptops,” says Huh. “We must keep devices within safe temperature limits while maintaining user comfort.”

When a device connects to a charger, the goal is to deliver as much power as possible to the battery quickly. In notebook and Chromebook applications, chargers often supply 45–65 W. Any efficiency loss turns into heat; even a 0.5 % drop can dissipate half a watt on a tiny PCB area, raising local temperature.

Figure 2: Circuit layout for the SM58IP04 single‑chip

Designers must therefore prioritize high‑efficiency architectures that enable precise control and reduce power loss, preserving device longevity and performance.

“The SM58IP04 addresses both high efficiency and optimal thermal dissipation through a package that maximizes heat flow to the PCB,” explains Huh. “Higher efficiency means less heat inside the enclosure, which improves overall system temperature.”

To support ongoing R&D, Silicon Mitus opened a new Design Centre in Pavia, Italy, in 2017, leveraging a skilled pool of analog designers. The facility is equipped to deliver next‑generation battery chargers that unlock the full potential of USB‑Type‑C in mobile and laptop applications.

“We invested in USB‑Type‑C battery chargers for laptop/Chromebook use and in voltage‑divider components for mobile devices,” says Huh. “The SM58IP04’s output voltage can be programmed with 12.5 mV granularity, fully compliant with the 20 mV step requirement of USB‑PD 3.0. Our portfolio enables battery‑charger architectures that bypass internal power conversion, eliminating the main source of loss while keeping cable currents within 3 A—obviating the need for expensive e‑marked cables above 3 A.”

The global PMIC market is projected to grow at a CAGR of 4.6 % and reach $56.48 billion by 2026, reflecting the rising demand for smarter, more efficient power‑management solutions.