RT9470WSC

Overview

The RT9470WSC is a single-cell lithium-ion/polymer 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. It is housed in a 30-WLCSP package measuring 2.1x2.5 mm. The component functions within a temperature range of -40°C to 85°C and includes protection against overcurrent, overtemperature, and overvoltage/undervoltage conditions.

Feature Summary

• Supports constant-current and constant-voltage charging profiles with programmable charge timer
• Integrates comprehensive fault protection mechanisms including overcurrent, thermal, and voltage safeguards
• Enables digital control and monitoring via I2C communication interface

Applications

• Portable electronic devices requiring single-cell lithium-ion or polymer battery management
• Mobile phones and smartphones
• Tablets and handheld computing devices
• Wearable technology with compact power requirements

Procurement Notes

Verify the exact part number suffix to ensure correct packaging and tape specifications. Confirm that the I2C address configuration matches your system design requirements. Check for RoHS compliance status if environmental regulations apply to your manufacturing process. Ensure the WLCSP package dimensions align with your PCB footprint constraints. Validate thermal performance under maximum load conditions during integration.

Selection Notes

Select this component when designing systems requiring high-efficiency charging for single-cell batteries with limited board space. The WLCSP package offers a small footprint suitable for dense layouts. Consider the I2C interface if digital monitoring and control are necessary for battery management. Evaluate the 3A current capability against the target battery's specifications. Ensure the input voltage range covers the available power source characteristics.

Part Context

The RT9470 belongs to Richtek's family of battery charger integrated circuits designed for portable applications. This specific variant utilizes a wafer-level chip-scale package to minimize board area consumption. It complements other PMIC solutions by providing dedicated charging functionality with digital control capabilities. The device is intended for use in consumer electronics where size and efficiency are critical design parameters.

Replacement Considerations

The RT9470DWSC is documented as a parameter-equivalent substitute. Verify pin compatibility and electrical specifications before substitution. Ensure the alternative package type meets mechanical constraints of the existing design.