ET9640

Overview

The ET9640 is a fully integrated power management unit designed for portable power banks, mobile chargers, and backup battery applications. It combines a high-efficiency synchronous step-up boost converter with a linear battery charger. The boost converter delivers up to 1A output current at 5V from a lithium-ion input. The charger supports up to 1A input current from an AC adapter. The device features short-circuit protection, reversed current protection between boost output and input, and programmable charging current. It achieves up to 96% efficiency during boosting and operates in an ESOP8 package.

Feature Summary

• Integrates a synchronous boost converter and linear charger in a single chip
• Provides hardware-based short-circuit and reversed current protection
• Eliminates the need for external MOSFETs and control circuits
• Supports single LED indicator for battery level display

Applications

• Portable power banks
• Mobile chargers
• Backup battery chargers
• TWS earphone charging cases

Procurement Notes

Verify the manufacturer designation carefully, as public documentation primarily associates this part number with Yuanta (ETA). Confirm whether ETEK MICROELECTRONICS is the authorized distributor or if the part represents a specific variant or rebranding. Request official datasheets to validate pinout compatibility and electrical specifications before integration into designs.

Selection Notes

Select this component for applications requiring a compact solution for lithium-ion battery charging and discharging without external switching transistors. It is suitable for devices prioritizing cost reduction through simplified bill of materials. Ensure the design accommodates the ESOP8 package constraints and thermal requirements for 1A continuous operation.

Part Context

This part belongs to a family of integrated power management units aimed at simplifying portable charger designs. Similar components often integrate boost converters and chargers to replace discrete solutions involving multiple MOSFETs and controllers, reducing system complexity and assembly costs for consumer electronics.

Replacement Considerations

Public data does not confirm direct substitute part numbers for the ET9640 under the ETEK MICROELECTRONICS brand. Cross-reference with ETA9640 specifications for potential functional equivalents, but verify all electrical parameters and pin configurations independently.