BD71631QWZ-TR

Overview

The BD71631QWZ-TR is a battery management IC designed for efficient charging and power monitoring in portable devices. It supports input voltages between 4.5V and 5.5V, with adjustable charging current capabilities suitable for small capacity batteries such as 27mAh cells. The device integrates low-power DCDC functionality, achieving ultra-low standby consumption of approximately 180nA for the converter section, enabling extended battery life in sleep modes. It features multiple output voltage options controlled via external pins, ensuring stable operation across various load conditions without voltage overshoot or undervoltage during transient changes.

Feature Summary

• Integrates battery charging management with ultra-low quiescent current DCDC conversion
• Provides adjustable output voltages through dedicated control pins for flexible system design
• Ensures stable voltage regulation under dynamic load transitions and battery connection events

Applications

• Bitcoin electronic keys requiring minimal standby power consumption
• Thin wallet designs incorporating e-ink displays and integrated batteries
• Portable data loggers utilizing small capacity lithium-ion cells

Procurement Notes

Verify the specific suffix QWZ against official RoHM documentation to confirm pinout compatibility and thermal characteristics. Ensure the ordering part number matches the required tape-and-reel quantity specifications. Cross-reference the datasheet revision date to validate feature availability and manufacturing status before finalizing component selection for production.

Selection Notes

Select this component when designing systems that demand simultaneous battery charging and ultra-low power DCDC regulation within a compact footprint. Evaluate the need for adjustable output voltages and the specific charging current requirements relative to the target battery capacity. Confirm that the input voltage range aligns with the available power source infrastructure.

Part Context

This IC belongs to ROHM's advanced battery management solution family, targeting applications where space constraints and energy efficiency are critical. It combines power supply management functions into a single package, reducing the bill of materials and board area compared to discrete solutions. The technology supports modern portable electronics that require long battery life and rapid charging capabilities.

Replacement Considerations

BD71631QWZ

FAQ

How is the output voltage adjusted on the BD71631QWZ?

The output voltage is configured using external control pins, specifically VSET1 and VSET2, which allow for selectable voltage levels.

What is the typical standby current consumption of the DCDC section?

The DCDC converter section consumes approximately 180nA in standby mode, contributing to extended battery life in powered-off states.