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It is reported that the European Union has announced the unified use of Type-C ports by 2024. Data predicts that after achieving the unification of charging ports, not only will it save consumers 250 million euros per year in expenses, but it will also reduce 11000 tons of electronic waste. Using Type-C fast charging instead of traditional charging devices can greatly reduce electronic waste, improve charging efficiency, and reduce energy waste.

The new USB PD3.1 fast charging standard has increased the charging power from the original 100W to 240W or even higher, and supports a voltage output of up to 48V. The fast charging scenario has also been further extended from consumer electronics and other fields to IoT devices, smart homes, power tools, communication and security devices, automobiles and medical fields.

Statistics show that the annual shipment of electric tools exceeds 100 million units, making it one of the top ten mainstream application scenarios for fast charging. However, the penetration rate of fast charging for electric tools is not high. The built-in power cell of electric tools has high-performance charging and discharging capabilities, making it very suitable for fast charging. Consumers also have a strong demand for fast charging of electric tools.

Nanxin Technology has launched the SC5650 SC8815 SC2021A fast charging solution to assist handheld electric tool TypeC in bidirectional fast charging and discharging.

With this solution, there will be no need to use dedicated adapters for charging in the future. A Type-C fast charging system can perfectly meet daily charging needs.Supporting PD and multiple fast charging protocols, it can efficiently adjust the voltage of 5V~20V adapters and charge multiple series of batteries. It also supports reverse discharge of up to 60W, serving as a power bank for fast charging of portable devices with other Type-C ports, to meet the emergency needs of users. The standby current of this solution is only 4uA, which can maximize the retention of battery power even if not used for a long time, making it convenient for users to use it again.

SC5650 SC8815 SC2021A

For the bidirectional charging and discharging requirements of handheld electric tools TypeC, the Nanxin lithium battery protection chip SC5650 can be used in combination with the synchronous voltage rise and fall control chip SC8815 and the fast charging protocol control chip SC2021A. The highly simplified integrated solution is suitable for multi cell battery voltage rise and fall charging and discharging, with an efficiency of up to 96.2%, extremely low standby current (4uA), and multiple protections.

Demo display:

Length: 40mm Width: 40mm Height: 9mm

Scheme diagram display:

Advantages of the plan: 

• &Middle; Charging and discharging design suitable for electric tools

• &Middle; Boost/drop charger suitable for 2-5 batteries

• &Middle; Charging/discharging power up to 65W (20V 3.25A)

• &Middle; Extremely low standby current (4uA)

• &Middle; Charging management, including trickle charging, CC charging, CV charging, and charging termination

• &Middle; Efficiency up to 96.2%

• &Middle; Low voltage ripple

• &Middle; Multiple protection measures including UVP, OVP, OCP, SCP, and OTP

• &Middle; Simplified PCB size (40mm * 40mm)

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Efficiency curve:

Charging curve:

Ripple and transient response:

Low standby current:

Product Introduction - SC5650(High precision protector for 2-5 lithium batteries)

Product features:

&Middle; Lithium battery protector that supports 2-5 batteries

&Middle; IC working temperature range: -45 ℃~85 ℃

&Middle; Support overvoltage protection (OVP) √ 3.0 V to 4.575V,± 25mV accuracy (25 ℃)

&Middle; Support voltage protection (UVP) √ 1.2V to 3V,± 50mV accuracy (25 ℃)

&Middle; Support battery disconnection detection protection

&Middle; Support overvoltage secondary protection and display

&Middle; Adjusting OVP and UVP delay time through external resistors

&Middle; Supports 3-level discharge overcurrent protection:

• -Discharge overcurrent primary protection point: 10mV-85mV

• -Secondary protection point for discharge overcurrent: 20mV-170mV

• -Short circuit protection point: 40mV-340mV

&Middle; Supports charging overcurrent protection (COC)

&Middle; Charging overcurrent protection point: 5mV-80mV

&Middle; Support battery temperature protection

&Middle; COC: 5mV-80mV

&Middle; Support battery temperature protection

• -COT: 45 ℃/50 ℃

• -CUT: -5 ℃/0 ℃

• -DOT: 6 ℃/70 ℃

• -DUT: -15 ℃/-10 ℃

&Middle; Support NTC disconnection detection

&Middle; Supports 0V battery charging function

&Middle; Support charging and discharging path heterogeneous applications

&Middle; Support cascading applications

&Middle; Supports hot shutdown

&Middle; Low power consumption:

• -Normal mode (typical value is 20uA)

• -Sleep mode (typical value is 6uA)

Application scenario: 

&Middle; Electric tools

&Middle; Electric bicycles

&Middle; Backup battery

SC2021A(Type-C/PD and dual DPDM fast charging controllers)

Product features:

&Middle; USB Type-C

• -Support Type-C receiving protocol

• -Configurable resistor Rp

&Middle; USB power transfer

• -Supports DFP USB PD 3.0 (including PPS)

• -Hardware BMC transmitter and receiver

• -Full functional physical layer

• -Hardware detection message and automatic reply to GoodCRC

• -Automatically detect hardware reset messages (hardreset)

• -Integrated PD 3.0 protocol engine

• -SOP for integrating VCONN and supporting electronic labeling

&Middle; Dual DPDM fast charging interface

• -Integrated DPDM interface with 2 sets of firmware control

• -Supports Apple charging, BC1.2, DCP, HVDCP, FC, AFC, FCP, SCP, VOOC, UART, and other proprietary charging protocols

&Middle; MCU subsystem

• -Integrated 32-bit high-performance MCU core

• -32k Byte OTP and 2.5k Byte RAM

• -Reserve independent space to store chip ID codes

• -Supports UART, I2C interfaces, and multiple I/O

• -Support sleep mode

&Middle; Analog module

• -Support adapter OPTO interface

• -Support DCDC FB voltage regulation interface

• -Built in dual DACs for CC/CV loop control

• -10-bit ADC monitors voltage, current, and external signals

• -Integrated high edge current detection amplifier

• -Integrated NMOS gate driver

• -Integrated VBUS discharge path

• -Integrated temperature sensing module

&Middle; protection mechanism

• -CC1/CC2 can withstand a high voltage of 26V

• -DP/DP can withstand a high voltage of 12V

• -The chip provides multiple protection mechanisms: OVP, UVP, SCP, VCONN OVP, VCONN, OCP, VCONN SCP, OTP, DPDM OVP, CC OVP

&Middle; Package: 32 pin QFN 4mm x 4mm x 0.75mm

Application scenario:

&Middle; Wall charging adapter

&Middle; Travel charger adapter

&Middle; Car charger

SC8815(Efficient and synchronized buck boost charging control chip with I2C control interface supporting bidirectional charging and discharging)

Product features:

&Middle; Supports 1-6 battery boost and boost charging, complete charging cycle management, including trickle charging, constant current charging, constant voltage charging, and charging cutoff

&Middle; Reverse voltage rise and fall discharge operation

&Middle; VBAT wide range: 2.7V to 36V, up to 40V

&Middle; VBUS wide range: 2.7V to 36V, up to 40V

&Middle; I2C programmable control of charging current and voltage

&Middle; I2C programmable control reverse output voltage

&Middle; I2C programmable control input and output current limiting

&Middle; I2C programmable control switch frequency

&Middle; Internally integrated 10 bit ADC

&Middle; Charging status indicator

&Middle; Event monitoring: Automatic detection of adapter access and load access

&Middle; Power path management

&Middle; Complete protection: undervoltage protection, overvoltage protection, overcurrent protection, short circuit protection, thermal shutdown protection

&Middle; QFN-32 packaging

Application scenario: 

&Middle; Mobile power supply with fast charging function

&Middle; USB power transfer

&Middle; Type C Hub

&Middle; Industrial power supply unit

Conclusion

The fast charging solution of Nanxin SC5650 SC8815 SC2021A will once again empower electric tools.

For users, there is no need to carry a dedicated charger to charge electric tools, and the discharge function can be used as a power bank to recharge portable electronic devices such as mobile phones. For manufacturers, there is no need to include a dedicated charger, which reduces production costs for the enterprise. For the environment, it also avoids the generation of new electronic waste after its service life expires.