RT9470DWSC

Overview

The RT9470DWSC is a single-cell lithium-ion/polymer switching battery charger IC manufactured by Richtek USA Inc. It supports a maximum charging current of 3A and operates with a battery pack voltage of 4.7V. The device accepts an input supply voltage up to 13.5V and features an I2C interface for programmability. Key programmable parameters include charging current and timer settings. Integrated fault protections cover overcurrent, overtemperature, and overvoltage/undervoltage conditions. It functions within a temperature range of -40°C to 85°C and is housed in a 30-WLCSP package measuring 2.1x2.5mm.

Feature Summary

• Supports programmable constant-current charging with integrated timer control via I2C interface
• Includes comprehensive fault protection mechanisms for overcurrent, overtemperature, and voltage anomalies
• Designed for single-cell lithium-ion and lithium-polymer battery chemistries

Applications

• Portable consumer electronics requiring single-cell battery management
• Mobile devices utilizing lithium-ion or polymer power sources
• Compact embedded systems with limited board space constraints

Procurement Notes

Verify the specific suffix DWSC against the manufacturer's official datasheet to confirm pinout compatibility and thermal characteristics. Ensure the procurement source provides valid RoHS compliance documentation. Confirm that the delivered components match the 30-WLCSP package dimensions specified in the technical data. Validate the manufacturing date code to ensure component freshness and reliability standards are met for your application requirements.

Selection Notes

Select this component when designing circuits for single-cell lithium batteries requiring high-efficiency switching regulation. The I2C interface allows for dynamic adjustment of charging parameters, making it suitable for applications needing precise power management. Consider the 30-WLCSP package size if board real estate is limited. Ensure the system design accommodates the 13.5V maximum input voltage and integrates appropriate external components as defined in the official reference design guidelines.

Part Context

This part belongs to the Richtek RT9470 series of single-cell switching battery chargers. The series is designed to provide efficient charging solutions for portable electronic devices. The RT9470DWSC variant specifically utilizes a WLCSP package, distinguishing it from other package options within the same functional family. It represents Richtek's focus on compact, high-performance power management for mobile applications.

Replacement Considerations

Consult the official Richtek datasheet for verified cross-reference part numbers. Ensure any substitute maintains identical I2C compatibility and package footprint.