LTC4121IUD-4.2#TRPBF

Battery Chargers Overview

The LTC4121IUD-4.2#TRPBF is a synchronous step-down battery charger IC from Analog Devices, designed for lithium-ion and lithium-polymer batteries. It delivers a constant current of 400mA with an adjustable output voltage set to 4.2V via external resistors. The device operates within a supply voltage range of 3.3V to 40V and features integrated power path management. Packaged in a compact 16-lead QFN (3mm x 3mm) format, it supports I2C telemetry for system monitoring.

Battery Chargers Feature Summary

• Integrates synchronous step-down converter architecture for high efficiency charging
• Includes built-in power path management to prioritize system load over battery charging
• Provides digital interface capabilities for configuration and status reporting

Battery Chargers Applications

• Portable electronic devices requiring efficient lithium-ion battery charging
• IoT sensors and modules with limited power budgets
• Medical equipment utilizing rechargeable battery systems

Battery Chargers Procurement Notes

Verify the specific suffix #TRPBF indicates tape-and-reel packaging when sourcing components. Confirm that the -4.2 designation corresponds to the fixed 4.2V output requirement for your target cell chemistry. Ensure compatibility with the 16-lead QFN footprint during PCB layout review to maintain thermal performance standards.

Battery Chargers Selection Notes

Select this component for applications requiring a compact solution with integrated power path management. It is suitable where input voltages may exceed battery levels, eliminating the need for separate boost converters. Consider the I2C interface if system-level telemetry and control are necessary for battery health monitoring.

Battery Chargers Part Context

This part belongs to the LTC4121 family of battery chargers manufactured by Analog Devices. It is specifically configured for 4.2V lithium cells. The series offers various output voltage options and current ratings to accommodate different battery chemistries and form factors within portable electronics design constraints.

Battery Chargers Replacement Considerations

Check for other variants within the LTC4121 family that offer different fixed output voltages or current limits. Verify pin-to-pin compatibility with alternative synchronous buck chargers if redesigning for supply chain resilience.