LM3420AM5X-4.2/NOPB

Battery Chargers Overview

The LM3420AM5X-4.2/NOPB is a lithium-ion battery charge controller manufactured by Texas Instruments, formerly National Semiconductor. It utilizes a constant-current/constant-voltage (CC/CV) charging algorithm suitable for single-cell Li-ion batteries. The device integrates an internal power switch to minimize external component count and board space. It operates within a supply voltage range of 4.2 V to 18 V. The unit is housed in a 5-pin SOT-23 package.

Battery Chargers Feature Summary

• Integrates an internal power MOSFET to reduce external component requirements
• Implements standard CC/CV charging profile for lithium-ion cells
• Includes thermal regulation to manage junction temperature during charging

Battery Chargers Applications

• Single-cell lithium-ion battery charging in portable electronics
• Power management for handheld devices
• Battery backup systems requiring compact form factors

Battery Chargers Procurement Notes

Verify the manufacturer designation as Texas Instruments, which acquired National Semiconductor. Confirm the specific suffix 'NOPB' indicates lead-free and RoHS compliance. Ensure the package type matches the required PCB footprint for the SOT-23-5 configuration before ordering.

Battery Chargers Selection Notes

Select this component when a compact solution for single-cell Li-ion charging is required without external switching transistors. It is appropriate for applications where thermal management is handled by the integrated regulator. Consider the input voltage range compatibility with the system power source.

Battery Chargers Part Context

This part belongs to the LM3420 family of battery charge controllers. The series is designed for simple, cost-effective charging solutions. Variants in the family may differ in output voltage settings or package options, but share the core CC/CV control architecture and internal switch integration.

Battery Chargers Replacement Considerations

Check for direct pin-compatible replacements within the LM3420 series from Texas Instruments. Verify that any substitute maintains the same 4.2 V output voltage setting and SOT-23-5 package dimensions.