Recently, Guangdong Xidi Microelectronics Co., Ltd. (hereinafter referred to as “Xidi Micro”), a leading analog chip manufacturer in China, announced the launch of a fully automatic, highly integrated lithium battery charge management chip – HL7090, which integrates a switching charger and two linear chargers (LDOs), which can achieve a full range of programmable charging parameter settings through the I2C interface. hmi screen panel
The HL7090 is a small, flexible, and efficient switch-mode charge management chip for a variety of IoT and wearable applications, including in-ear headphones, primarily for single-cell li-ion and lithium-polymer battery charging. The HL7090 integrates a load switch to accommodate switching between USB power and wireless charging power. At the same time, the chip’s integrated buck-switching charger operates in reverse boost mode, enabling two linear charger supplies (LDOs) to charge two accessories simultaneously via the battery boost output. Among them, the HL7090FN03 sub-model chip can also be programmed to set the charging parameters through the I2C interface. Therefore, the HL7090 is ideal for headphone applications.
The HL7090 provides fully automatic three-stage battery charge control, including trickle charge, constant current charge (CC), and constant voltage charge (CV) until the battery voltage reaches the charge cutoff voltage. During normal operation, if the voltage of the battery falls below its internal threshold, the HL7090 automatically restarts the charging cycle and automatically enters sleep mode or high impedance mode when the input power supply is not properly connected. The system charge status is reported to the host through the I2C interface.
The maximum input current value of the HL7090 can be set by the host, and the charge cut-off threshold can be set based on the battery voltage and the user-selectable minimum charge current. In addition to I2C interface communication and control, the chip also integrates a reset function of a safety timer (watchdog) to ensure system security. The HL7090 integrates a synchronous PWM controller, power MOSFETs, input current sense, high accuracy current and voltage regulation, charge cutoff, and more into a miniature (3mm x 3mm) QFN package.
David Nam, General Manager of Xidi Micro, said: “Our new lithium battery switch charging chip has the function of fully automatic charge management, eliminating all the worries of customers in the Internet of Things charging application solution, providing customers with convenient, worry-free and reassuring solutions. ”
