LTC4121IUD-4.2

Battery Chargers Overview

The LTC4121IUD-4.2 is a synchronous step-down battery charger from Analog Devices Inc., designed for lithium-ion and lithium-polymer cells. It integrates a 40V, 400mA constant-current/constant-voltage (CC/CV) charger with an I2C telemetry interface. The device supports input voltages up to 40V and operates within a junction temperature range of -40°C to +125°C. It features a 16-lead 3mm x 3mm DFN package.

Battery Chargers Feature Summary

• Integrates a high-efficiency synchronous buck converter for charging
• Provides digital monitoring via an I2C telemetry interface
• Supports standard CC/CV charging profiles for Li-Ion/Polymer batteries

Battery Chargers Applications

• Portable electronic devices requiring compact power management
• Industrial equipment with 40V input rails
• Battery-powered systems needing remote status monitoring

Battery Chargers Procurement Notes

Verify the specific suffix (#PBF or #TRPBF) against your assembly requirements. Confirm that the 40V input rating matches your system's maximum voltage. Ensure the I2C address configuration aligns with your controller design. Check the thermal performance in your final enclosure layout.

Battery Chargers Selection Notes

Select this component when a low-profile solution is required for single-cell lithium batteries. It is suitable for applications where digital feedback is necessary for battery health monitoring. Consider the 400mA output limit for smaller capacity cells. Evaluate the need for external components versus integrated solutions.

Battery Chargers Part Context

This part belongs to the LTC4121 family of battery chargers. It shares architectural similarities with other synchronous buck chargers but is distinguished by its specific voltage ratings and telemetry capabilities. The family includes variants for different battery chemistries and input voltage ranges.

Battery Chargers Replacement Considerations

Direct substitutes include other Analog Devices synchronous buck chargers with similar voltage and current ratings. Verify pin compatibility and software register maps before swapping. Alternative manufacturers offer comparable functions but may require circuit adjustments.