ISL88739BHRZ-T

Battery Chargers Overview

The ISL88739BHRZ-T is a lithium-ion/polymer battery charger IC designed for notebook applications, supporting 2 to 4 series cells. It features a Hybrid Power Boost (HPB) topology allowing simultaneous system power and battery charging. The device operates with an input voltage range of 8V to 22V and supports a maximum charge current of 8A. Key electrical parameters include a charging voltage accuracy of ±0.5%, adjustable in 16mV steps from 1.024V to 19.2V. Charge current limit accuracy is ±3%. The unit utilizes SMBus interface for programmability and is housed in a 32-QFN (4x4mm) package.

Battery Chargers Feature Summary

• Hybrid Power Boost (HPB) configuration enables Turbo Mode operation by boosting energy from the battery to the system bus when adapter capacity is exceeded.
• All internal switches utilize N-channel MOSFETs (NFETs) to optimize performance and minimize bill of materials cost.
• Internal charge pump provides fast or slow turn-on capabilities for NFETs to prevent system bus voltage drops during sudden battery removal.
• Includes PROCHOT# indicator for system low voltage, adapter overcurrent, battery overcurrent, and overheating conditions.

Battery Chargers Applications

• Notebook battery chargers
• Systems requiring simultaneous AC adapter power and battery charging
• High-power portable computing devices

Battery Chargers Procurement Notes

Verify component authenticity through authorized Renesas distributors due to end-of-life status. Confirm RoHS3 compliance and MSL level 3 handling requirements. Check for specific tape-and-reel packaging specifications corresponding to the suffix HRZ-T. Validate that the selected variant matches the required pinout and thermal characteristics for the target PCB design.

Battery Chargers Selection Notes

Select this component for designs requiring HPB functionality to support high-load scenarios where the adapter alone cannot sustain system power. Ensure the application benefits from the SMBus programmability for flexible current and voltage limits. Consider the 32-QFN package constraints for thermal management. Verify compatibility with the required input voltage range and battery cell count configuration.

Battery Chargers Part Context

The ISL88739B is part of the ISL88739 family of battery chargers from Renesas. It shares core architecture with variants like ISL88739HRZ but differs in packaging and reel configuration. The family is characterized by its hybrid boost capability and use of all-NFET switch technology for efficiency and cost reduction in notebook power systems.

Battery Chargers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The product status is listed as End of Life (EOL). Designers should consult Renesas for recommended alternatives or evaluate the broader ISL88739 family if compatible packaging and interface options exist.