High power, multi-protocol, Nanxin Technology adds two new products to its in-vehicle charging chip family

Nanxin Technology (stock code: 688484) simultaneously launched two heavyweight car charging cells - the high-power buck- boost converter SC87550Q/SC87580Q with a fully integrated USB PD solution , and the Type-C/PD fast charging controller SC2166Q that supports private charging protocols. These two products focus on the current pain points of slow car charging speed and poor compatibility, greatly improving the power and efficiency of car charging. At the same time, they can support more charging protocols and diversified terminal applications such as mobile phones, tablets, and laptops, injecting more power into the car charging system. At present, Nanxin Technology provides a rich product portfolio in the field of car charging. On the basis of supporting different customer needs, it continues to lead the car charging market through forward-looking product layout.

Focus on industry pain points and improve car charging experience

Compared with the rapidly developing mobile phone fast charging market, current car chargers still face the problem of low charging efficiency. The charging speed of the same terminal device in the car has dropped significantly, affecting the user experience. On the one hand, the power of the current in-car wired charging system itself is limited, and there is still a gap with the mobile phone fast charging of more than 100 watts; on the other hand, the protocol compatibility of the car charging system is poor, usually only supporting a single mainstream fast charging protocol, and it is difficult to give full play to the charging efficiency advantages of some terminal equipment private protocols.

Based on the above insights, Nanxin Technology has taken a two-pronged approach. Based on the original family of in-vehicle charging chips, it has upgraded and iterated its products from the two perspectives of high power and private protocol compatibility, improved car charging efficiency and experience, and promoted the development of the in-vehicle fast charging market.

High-power single-chip integrated solution makes car charging faster

SC87550Q/SC87580Q is a buck-boost converter that integrates four MOSFETs and a USB PD controller. It uses a 22 -pin 4mm*5mm wettable flank QFN package , has a wide input voltage range of 4.5V-36V , can output 3.3V-22.5V voltage, and supports a maximum continuous output current of 5A . SC87550Q and SC87580Q single chips can support up to 60W and 100W charging power, and SC87550Q does not require an external MOSFET, saving system BOM cost, and is perfectly adapted to high-power vehicle fast charging applications.

The chip adopts current mode control, which has faster transient response and better loop stability. Taking SC87550Q as an example, its peak efficiency can reach more than 97%, and the surface peak temperature can be as low as 62.7℃ under full load.

SC87550Q efficiency curve

Left: SC87550Q load transient response (input voltage 12V, output current slew rate 0.1A/μs; output voltage 20V, output current 0-5A-0), right: SC87550Q line transient response (input voltage 9V-18V, step size 30mV/μs; output voltage 20V, output current 3A)

*Test conditions: F PWM mode, no spread spectrum and line loss compensation, FSW=420kHz, RSENSE=5mΩ

SC87550Q/SC87580Q is compatible with Programmable Power Supply function and supports multiple mainstream charging protocols, including USB PD3.1, QC2.0/QC3.0, Huawei FCP, BC1.2, 3A Divider Mode, etc., providing users with All-in-one universal protocol support.

In terms of safety, these two chips provide a full range of protection mechanisms, including input overvoltage protection , output overvoltage protection, cycle-by-cycle current limiting, DP/DM/CCx short circuit to battery and short circuit to output protection, output short circuit protection , average output current limiting and thermal shutdown protection. When the battery voltage is low or the temperature is high, the output power can be automatically reduced to ensure system safety. The power management state machine of SC87550Q is shown in the figure below:

SC87550Q Programmable Power Management State Machine

For multi-port car charging applications, two chips of the same model can be used in parallel for dual PD ports, and can also achieve intelligent distribution of total energy .

Two typical circuits for implementing dual PD ports using two SC87550Qs

Support private protocols, say goodbye to the era of difficult car charger compatibility

SC2166Q is an automotive-grade Type-C/PD and DPDM fast charging controller with internal integrated feedback compensation. It is compatible with the latest Type-C, PD3.1, SCP and UFCS protocols, and can support high-voltage fast charging private protocols through the DPDM interface.

SC2166Q is based on a highly integrated design and uses a 24-pin 4mm*4mm QFN package. It integrates multiple components such as physical layer , voltage and current sensing, digital-to-analog/ analog-to-digital converter , gate driver, interface, protection circuit, etc., which minimizes external components and provides a cost-effective solution for car charging applications.

SC2166Q Typical Application Block Diagram

SC2166Q also supports a variety of protection mechanisms, including overvoltage protection, undervoltage protection, overcurrent protection, short circuit protection, overtemperature protection, DPDM overvoltage protection, CC overvoltage protection, VCONN overvoltage protection, VCONN overcurrent protection and VCONN short circuit protection, to ensure stable and reliable operation of the system.

Nanxin Technology's automotive-grade product family

Nanxin Technology's automotive solutions are aimed at future green and intelligent travel modes, covering applications such as on-board charging, smart cockpit , smart driving and body control, and are committed to providing customers with one-stop chip solutions. We are rooted in customer R&D scenarios, and continuously customize design iterations based on customer applications to help customers design more efficient, integrated and safer products in core automotive application areas more quickly.