BU1840AMUV-E2

Battery Chargers Overview

The BU1840AMUV-E2 is a synchronous switch-mode battery charger IC designed for two-cell solar applications. It supports lithium-ion batteries with a maximum pack voltage of 5.7V and delivers up to 400mA charging current. The device operates within a supply voltage range of 625mV to 1.98V, featuring an I²C interface for current monitoring. It includes built-in MPPT control with a voltage range of 0.7V to 1.5V and offers switching frequencies of 160kHz or 320kHz. Packaged in a 24-pin VQFN (4.0x4.0mm), it functions between -30°C and +85°C.

Battery Chargers Feature Summary

• Integrated Maximum Power Point Tracking (MPPT) controller optimized for solar energy harvesting
• Synchronous rectification architecture enabling efficient charge management at low input voltages
• Digital communication interface allowing programmable charging parameters and real-time status monitoring
• Comprehensive protection mechanisms including thermal shutdown and undervoltage lockout

Battery Chargers Applications

• Solar-powered portable electronic devices requiring efficient energy conversion
• Battery management systems utilizing photovoltaic cells as primary power sources
• Low-voltage rechargeable battery charging circuits in remote sensor nodes

Battery Chargers Procurement Notes

This component is officially designated as End-of-Life (EOL) by the manufacturer. Current market availability is restricted to existing stock or third-party distributors, with no new production from Rohm Semiconductor. Verification of part authenticity and storage history is critical due to the discontinued status. Designers should assess long-term supply risks and consider obsolescence mitigation strategies before finalizing procurement plans.

Battery Chargers Selection Notes

Select this IC specifically for applications powered by solar sources where input voltage remains low, typically below 2V. The integrated MPPT functionality eliminates external tracking circuitry, reducing bill of materials complexity. Ensure the design accommodates the specific UVLO thresholds and switching frequency options. Verify that the system's thermal environment stays within the specified operating temperature range to maintain reliability.

Battery Chargers Part Context

The BU1840 series belongs to Rohm’s portfolio of specialized battery charge management ICs tailored for renewable energy sources. This model targets the niche segment of dual-cell solar chargers, distinguishing itself through direct MPPT integration. It complements other PMIC offerings by providing a complete solution for converting variable solar output into stable battery charging profiles without complex external control loops.

Battery Chargers Replacement Considerations

No public confirmed substitute part numbers are available. As the product is discontinued, engineers must evaluate alternative battery charger ICs with similar low-input voltage capabilities and integrated MPPT features. Cross-reference specifications such as package dimensions, pinout compatibility, and electrical performance when selecting a replacement.