BQ2057DGK

Overview

The BQ2057DGK is a low dropout linear charge management integrated circuit designed for single-cell lithium-ion and lithium-polymer batteries. It operates with a supply voltage range of 4.5 V to 15 V and provides a regulated output voltage of 4.2 V. The device supports a programmable charging current up to 2 A. It is housed in an 8-VSSOP surface-mount package and functions within a temperature range of -20°C to +70°C.

Feature Summary

• Linear charge management architecture optimized for single-cell lithium-based battery chemistries
• Low dropout regulator design enabling efficient charging from varying input supply voltages
• Programmable constant-current charging capability allowing customization of charge rates

Applications

• Portable electronic devices requiring single-cell lithium-ion power sources
• Lithium-polymer battery charging systems in compact consumer electronics
• Industrial control modules utilizing single-cell rechargeable battery backups

Procurement Notes

Verify the manufacturer origin carefully, as the BQ2057 series is primarily associated with Texas Instruments. Benchmarq listings may indicate specific variants or legacy stock. Confirm the exact suffix (DGK) matches the required 8-VSSOP package and electrical specifications before ordering. Ensure compatibility with the target system's thermal and voltage requirements.

Selection Notes

Select this component when a simple linear charging solution is sufficient for single-cell applications. It is suitable for designs where efficiency is less critical than simplicity and low noise. Verify that the maximum power dissipation capabilities accommodate the expected input-output voltage differential and charging current without excessive heat generation.

Part Context

The BQ2057 series belongs to a family of advanced linear charge management ICs. While often linked to Texas Instruments, Benchmarq distributes related power management solutions. This specific part addresses the need for reliable, cost-effective charging in portable devices using standard lithium-ion or polymer cells.

Replacement Considerations

For discontinued variants like BQ2057PDGK, the MCP73843-420I/MS by Microchip Technology is listed as a similar alternative. Verify pinout compatibility and electrical parameters before substitution.