Introduction

DrMOS, short for Driver-MOSFET, is an energy-efficient technology introduced by Intel in 2004. By integrating MOSFET and MOS drivers into the same package, it achieves dual optimization in terms of size and efficiency. Compared to traditional separate MOSFETs, the integrated DrMOS reduces the occupied area to one-fourth while increasing power density threefold. When used in conjunction with multiphase controllers, DrMOS can provide larger currents at the same voltage, enabling more efficient switching operations and contributing to higher power conversion efficiency. This makes it suitable for low-voltage, high-power applications.

Initially applied mainly in the server motherboard domain, DrMOS technology has garnered attention from wireless charging engineers due to continuous advancements in wireless charging technology. While DrMOS serving servers typically utilizes a combination of 2 MOSFETs and 1 MOS driver in one, in the realm of wireless charging, DrMOS commonly adopts 4 MOSFETs—two high-side and two low-side MOSFETs. The high-side MOSFETs are connected to the power source, while the low-side MOSFETs are grounded, forming a complete "bridge" structure in a full-bridge topology. This arrangement controls the transmission of wireless energy, optimizing efficiency and response speed.

DrMOS Wireless Charging Full-Bridge Power IC

ChargerLAB has compiled information on nine DrMOS wireless charging full-bridge power ICs from five major wireless charging chip manufacturers. The table below provides a detailed overview of each company's flagship products and their respective packages.

Next, we will delve into the specific parameters and distinctive features of each chip.

Southchip

Southchip is a high-performance semiconductor design company specializing in power, battery management, and embedded systems. They have multiple product lines including charge pumps, DC/DC converters, AC/DC converters, wired charging, wireless charging, and fast charging protocols.

Leveraging their independently developed technologies in voltage boosting and bucking charging, charge pumps, and GaN direct drive, they've introduced several high-performance products that have gained widespread recognition within the industry.

Southchip SC5001

The SC5001 is a highly integrated wireless power transmitter analog front end that contains all of the analog components required to implement a WPC compliant transmitter. It integrates a full-bridge power driver with MOSFETs, current sense amplifier, bootstrap circuit, etc. And the transmitter can provide with up to 15W of output power.

It also supports foreign object detection (FOD) by continuously monitoring the amount of power transferred and comparing that to the amount of received power,as reported by the receiver.In order to do this, the SC5001 measures the input DC current very accurately using a current sense amplifier. Besides, the SC5001 also supports input under voltage lockout (UVLO), over-current protection (OCP) short-circuit protection (SCP) and over-temperature protection (OTP). These protections further enhance the reliability of the total wireless power transmitter system. It adopts 3 x 3 mm QFN19 package.

Southchip SC5003

The SC5003 is a highly integrated wireless power transmitter analog front end that contains all of the analog components required to implement a WPC compliant transmitter. It integrates a full-bridge power driver with MOSFETs, current sense bootstrap circuit, amplifier, communication demodulator and protection circuit. It can work with transmitter controller together to create a high-performance wireless power transmitter that complies with both the WPC V1.2.4 Extended Power Profile (EPP) and Baseline Power Profile (BPP).

The system supports foreign object detection (FOD) by continuously monitoring the amount of power transferred and comparing that to the amount of received power,as reported by the receiver. In ordel to do this, the SC5003 measures the input DC current very accurately using a current sense amplifier. Besides, it also supports input under voltage lockout (UVLO), input over-voltage protection (OVLO), over-current protection (OCP) and over-temperature protection (OTP). The SC5003 is available in a compact 4 x 4 mm FCQFN package.

Southchip SC5004

The SC5004A is a highly integrated wireless powe transmitter analog front end that contains all of the analog components required to implement a WPO compliant transmitter. It integrates a full-bridge power driver with MOSFETs, current sense amplifier, bootstrap circuit, communication demodulator, linear regulator and protection circuit.

The SC5004A can work with transmitter controller to create a high-performance wireless power transmittel that complies with both the WPC V1.2.4 Extended Power Profile(EPP) and Baseline Power Profile (BPP). Once an EPP receiver is detected, the transmitter will provide with up to 15W of output power.If a BPF receiver is present, the transmitter will deliver only up to 5W of output power.

The system supports foreign object detection (FOD) by continuously monitoring the amount of powe transferred and comparing that to the amount ot received power, as reported by the receiver. In orde to do this, the SC5004A measures the input DO current very accurately using a current sense amplifier. Besides, it also supports input under voltage lockout (UVLO), over-current protection (OCP) and over-temperature protection (OTP). These protections further enhance the reliability of the total wireless power transmitter system. The SC5004A is available in a compact 4 x 4mm FCQFN package.

Southchip SC5008

The SC5008 is a highly integrated analog-front-end that contains all of the analog components required to implement a wireless power transmitter compliant with WPC specifications.The device integrates a full-bridge power stage with low-RDs(on) MOSFETs, gate drivers, 5V & 3.3V LDOs, communication demodulators and input current sensing circuit. lt can work with transmitter controller to create a high-performance and cost-effective wireless power transmitter system that complies with both the WPC V1.3.2 Baseline Power Profile (BPP, not more than 5W) and Extended Power Profile (EPP, up to 15W).

It supports foreign object detection (FOD) by continuously monitoring the amount of power transferred and comparing it to the amount of received power, as reported by the power receiver. In order to do this, the SC5008 measures the input DC current very accurately using a current sense amplifier. The built-in 5V and 3.3V LDOs can power both the internal and external circuits. Besides, the SC5008 supports under-voltage lockout (UVLO)，over-current & short-circui protection (OCP & SCP) and over-temperature protection (OTP).The protections significantly enhance the reliability of the whole wireless power transmitter system. The SC5008 is available in a compact 3mm x 4mm QFN package.

iSmartWare

iSmartWare is a digital-analog hybrid chip design company specializing in power management chips. Their primary focus revolves around research, design, and sales of power management chips. iSmartWare's products find extensive application in power banks, in-car chargers, GaN chargers, outdoor energy storage units, and smart outlets, among other devices.

iSmartWare SW5006

SW5006 is a power stage chip designed for the highest 15W power in the wireless charging transmitter. It supports both direct drive PWM mode and PWM mode controlled by register parameters.

It integrates a full-bridge converter consisting of two independent half-bridges, with 4 NMOSFETs and corresponding drive circuits integrated. The full-bridge converter supports both external and internal drive modes. In the external drive mode, each half-bridge is independently controlled by PWM1 and PWM2 input signals. In the internal drive mode, each half-bridge is controlled by the PWM generator inside the chip. The dead time and drive strength of each half-bridge's drive signal can be adjusted through registers.

SW5006 supports fast charging protocols such as PPS/PD3.0/PD2.0FCP/SCP/AFC, and features ASK decoding, Q value detection, as well as mechanisms for input overvoltage protection, full-bridge overcurrent protection, and chip overheating protection. It is packaged in QFN-23 (4x4mm).

Chipown

Chipown is a high-tech enterprise focusing on power semiconductor research and development. Their product lines include analog/digital architecture AC-DC, DC-DC, Driver IC, and Power Discretes, widely used in various fields such as home appliances, charging & adapters, smart grids, communications, servers, and automobiles.

Chipown PN7727

Chipown PN7727 is a fully integrated smart power stage chip supporting Qi2 20W wireless charging. It integrates a driver and an H-bridge MOSFET, along with a built-in 5V regulator for MCU power supply. The chip supports 3-12V power supply with a working frequency of up to 500KHz.

PN7727 has internal undervoltage and overheating protection, with two PWM input pins compatible with 5V and 3.3V signal levels, providing excellent anti-interference capabilities. PN7727, designed on a single wafer, comes in a QFN2*2-16L package with a heat dissipation pad on the bottom, effectively reducing device temperature. It is suitable for wireless charging transmitters and DC motor drive applications, offering outstanding compact design and improved chip performance stability in its class.

The PN7727 integrates a driver and four highly efficient power-stage MOSFETs, along with a built-in bootstrap high-voltage PMOS and a 5V/50mA LDO. Additionally, it features an adaptive dead-time function, allowing flexible adjustment of power transmission based on different wireless charging scenarios, thereby providing an enhanced charging experience.

NuVolta

NuVolta Technologies, established in 2014, focuses on the research and innovation of power management chips and one-stop solutions. Leveraging their technical expertise, NuVolta has become a leader in providing mature solutions for both wireless and wired charging.

NuVolta's products cover wireless charging receiver and transmitter chips, wired fast charging chips, power management chips and automotive power management chips, etc., helping customers expand into consumer electronics, automotive electronics, industrial and medical markets.

NuVolta NU1020

NuVolta NU1020 is a highly integrated full-bridge power IC optimized for wireless charging transmitter solutions. The device incorporates all essential functions, including efficient power FETs, low-EMI FET drivers, bootstrap circuits, a 5V integrated DC/DC power supply, 3.3V (configurable to 2.5V) LDO, and non-destructive current measurement.

It features a proprietary current measurement circuit for FOD (Foreign Object Detection) power measurement, providing accurate current readings.

NU1020 includes various protection features such as input undervoltage lockout, overvoltage protection, overcurrent protection, and thermal shutdown. It also includes an I2C interface for communication with controllers, easily expandable to multi-coil solutions. The device uses a 4mm×4mm QFN package with optimized heat performance, ensuring stable and reliable operation.

NuVolta NU8060Q

NU8060Q is an integrated, efficient, and high-precision wireless charging transmitter chip. It supports wide voltage input, recommended up to 27V (maximum 29V), with a transient voltage of up to 36V. A single chip can handle up to 80W of wireless charging receiver (Rx) load, enabling high-power wireless fast charging.

It integrates a low-impedance full bridge with excellent thermal performance compared to existing products on the market. NU8060Q includes crucial features for wireless charging applications, such as full bridge drive, 5V LDO, high-precision current detection, Q value detection, and more. It stands out as one of the most advanced and performance-optimal high-power fast charging chips in the current automotive wireless charging market.

NU8060Q introduces a full bridge design with low impedance of 12 mΩ, optimizing thermal performance. It supports 50W fast charging and can be extended to 80W after heat improvements. The current detection accuracy is up to ±1%, improving to ±0.5% at loads exceeding 15W, ensuring efficient and accurate charging. NU8060Q integrates high-precision frequency and Q value detection functions, offering three demodulation modes—voltage, peak current, and average current. It also includes interrupt reporting capabilities.

WPINNO

The team at WPINNO comprises members with extensive work experience from renowned semiconductor design companies worldwide. They focus on providing customers with a variety of highly competitive ICs and comprehensive solutions for power supply and control. WPINNO's product range includes DC-DC power conversion, lithium battery charging BMS, wireless charging, fast charging protocols, and other power and signal processing product lines. Currently, these products have been widely adopted in consumer terminals, mobile phones, communications, and other product fields.

WPINNO WP8012

WP8012 is a full-bridge wireless charging transmitter chip that integrates full-bridge MOSFETs, MOSFET drivers, current sensing amplifiers, bootstrap circuits, communication demodulators, linear regulators, and various protection circuits.

It complies with the latest WPC V1.2.4 Extended Power Profile (EPP) and Baseline Power Profile (BPP) standards. When used in conjunction with WP8017 or WP7038, they can form a wireless power transmission system, providing up to 20W of output power.

It also supports FOD (Foreign Object Detection) functionality required by EPP. This is achieved by continuously monitoring the transmission power and comparing it with the received power reported by the receiver. WP8012 also incorporates various protection mechanisms, including input undervoltage lockout (UVLO), overcurrent protection (OCP), short circuit protection (SCP), and over-temperature protection (OTP). It is packaged in FCQFN19.

Summary of ChargerLAB

The DrMOS wireless charging full-bridge power ICs integrate a full-bridge power driver, efficient MOSFETs, precise current sensing amplifiers, advanced bootstrap circuits, highly sensitive communication demodulators, stable linear regulators, and comprehensive protection circuits. These ICs seamlessly collaborate with transmitter controllers to create an efficient and high-performance wireless power transmitter.

As technology continues to advance, wireless charging has gradually become integrated into various aspects of our lives, including wireless charging for smartphones, in-car wireless charging, and more. Due to its advantages in high integration, DrMOS wireless charging full-bridge power ICs have a significant edge in providing smaller, more efficient wireless charging solutions, making them highly competitive in the market.

A Deep Dive into Nine DrMOS Wireless Charging Full-Bridge Power ICs