STC4054GR

Overview

The STC4054GR is a standalone linear Li-Ion battery charger designed for single-cell applications, packaged in TSOT23-5L. It operates within USB power specifications and features constant current/constant voltage regulation with thermal regulation to maximize charge rate without overheating. The device offers a preset 4.2V charge voltage with 1% accuracy and programmable charge current up to 800mA via a single external resistor. Key electrical parameters include a C/10 automatic charge termination threshold, a 2µA battery discharge current when the adapter is removed, and a shutdown mode supply current of 25µA.

Feature Summary

• Integrates thermal regulation to automatically reduce current during high junction temperatures, ensuring safe operation under high power or ambient heat conditions.
• Eliminates the need for external MOSFETs, sense resistors, or blocking diodes, simplifying the circuit design for portable applications.
• Includes soft-start functionality to limit inrush current and low battery voltage detection for appropriate precharge settings.
• Provides a dedicated charge status output pin and a charge current monitor output suitable for gas gauging applications.

Applications

• Charging single cell Li-Ion batteries directly from USB ports
• Portable electronic devices requiring compact battery management solutions
• Systems utilizing USB power specifications for charging

Procurement Notes

Verify the specific suffix GR against the manufacturer's official datasheet to confirm package type and tape/reel configuration. Ensure compatibility with the target PCB footprint for the TSOT23-5L package. Cross-reference the part number with authorized distributors to confirm authenticity and avoid counterfeit components. Check for any specific handling requirements related to electrostatic discharge sensitivity.

Selection Notes

Select this component for designs requiring a minimal external component count for single-cell Li-Ion charging. It is suitable for applications where space constraints favor the TSOT23-5L package. Consider the 800mA maximum current capability and the programmable nature of the charge current when sizing the external programming resistor. Verify that the system can accommodate the thermal regulation behavior if operating in high-temperature environments.

Part Context

The STC4054 series belongs to STMicroelectronics' portfolio of analog mixed-signal integrated circuits focused on power management. This specific model addresses the growing demand for efficient, space-saving charging solutions in consumer electronics. It complements other battery management products by offering a complete linear charging solution without complex switching regulator topologies.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Engineers should consult official STMicroelectronics resources or authorized distributor databases for verified alternatives based on specific electrical and mechanical requirements.

FAQ

How is the charge current programmed?

The charge current limitation is programmed using a single resistor connected between the PROG pin and GND.

What happens when the external adaptor is removed?

The STC4054 turns off, and a 2µA current flows from the battery to the device.

Does the device require external blocking diodes?

No, the STC4054 does not require external blocking diodes, sense resistors, or MOSFETs.