RT9759WSC

Overview

The RT9759WSC is a smart capacitor divider charging IC designed for single-cell lithium-ion batteries. It integrates high-voltage tolerance to enable direct connection to USB ports without external series resistors, simplifying the circuit design. The device supports input voltages up to 20V and provides regulated charging current. It features an integrated power path management system that automatically balances between battery charging and system power supply. The component operates within a temperature range of -40°C to +85°C and is available in a compact WLCSP package.

Feature Summary

• Integrates high-voltage tolerant analog switches for direct USB connection
• Supports automatic power path management for system load sharing
• Includes comprehensive safety protections against thermal and electrical faults

Applications

• Smartphone battery charging circuits
• Tablet computer power management systems
• Portable media players with USB connectivity

Procurement Notes

Verify the specific suffix code against the manufacturer's official datasheet to confirm pinout compatibility and thermal specifications. Ensure the selected variant matches the required packaging format for your assembly process. Cross-reference the ordering information with the latest Richtek documentation to avoid discrepancies in revision levels or regional compliance standards.

Selection Notes

Choose this component when designing space-constrained mobile devices requiring simplified charging topologies. It is suitable for applications where minimizing external passive components is critical. Evaluate the thermal performance requirements relative to the expected charging current and ambient operating conditions before finalizing the design.

Part Context

This part belongs to Richtek's family of smart charging solutions for portable electronics. It addresses the industry trend toward higher voltage USB inputs by eliminating the need for bulky series protection resistors. The device complements other battery management products like fuel gauges and power switches in complete mobile power architectures.

Replacement Considerations

Check for updated revisions such as RT9759P-A which may offer minor parameter improvements. Verify pin-to-pin compatibility if substituting from older generations of capacitor divider chargers.