LY6394ET

LY6394ET is a fully integrated power management IC designed for Bluetooth charging cases, integrating lithium battery charge management, a synchronous boost converter, battery fuel gauge, and protection function modules. The integrated adapter adaptive function prevents no-charging or adapter damage scenarios. It supports Hall sensor direct-drive control of the EN pin, enabling automatic reconnection of earphones when the case is opened, LED illumination for 4 seconds upon opening, and automatic boost activation upon closing — eliminating the need for external output loop control circuits such as MOSFETs and transistors. The EN pin can also be controlled by an MCU to manage OUT output for one-way communication. The integrated NTC temperature protection function requires only a single NTC resistor by default to monitor lithium battery temperature during both charging and discharging states.

Applications

• Bluetooth earphone charging case
• Portable lithium battery applications

Key features

• NTC monitoring for charge/discharge
• Hall sensor or MCU direct-drive control output
• With Hall sensor: lid-open light-on for 4 seconds, lid-close auto-activates boost
• Adapter adaptive voltage: 4.6V
• Light-load auto-shutdown current: 7mA
• Standby voltage: 2V/VBAT/0V selectable
• Standby current: 4.5uA
• Independent detection for dual earbud insertion
• Charge current: 200mA ~ 500mA selectable
• Discharge current: 300mA
• Output overvoltage, short-circuit, and overcurrent protection
• Intelligent temperature control
• 1/2/3/4-LED battery level indication
• Boost efficiency up to 93%
• Package: ESSOP10