74LV4799DB,118

Overview

The 74LV4799DB,118 is a low-voltage Si-gate CMOS control IC designed for NiCd and NiMH battery management. It operates within a supply voltage range of 0.9 V to 6 V, supporting 1 to 4-cell applications. The device integrates a precision oscillator, a 17-stage divider, and a 10-stage up/down counter to measure charge, discharge, and self-discharge times. Key features include automatic power-on reset, scan test facilities, and outputs for LED status indication and battery-low detection (MOLLI). It supports trickle charge switching and includes debounce circuitry on the discharge input.

Feature Summary

• Wide supply voltage range of 0.9 V to 6 V allows for 1 to 4-cell battery applications.
• On-chip timer calculates battery capacity by measuring charge, discharge, and self-discharge times using an accurate internal oscillator.
• Includes automatic switch-over to trickle charge mode after the completion of the charge time.
• Provides battery status indication via LED output and MOLLI output for battery-low detection.

Applications

• Time-controlled NiCd and NiMH low-current chargers
• Domestic appliances such as rechargeable battery shavers and electric toothbrushes
• Portable equipment including notebook PCs, laptop PCs, and camera flash units
• Personal communications devices like cordless telephones and pagers

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for any specific handling requirements related to moisture sensitivity. Ensure that the ordering suffix matches the required package type and temperature range specifications before finalizing procurement orders.

Selection Notes

Select this component for applications requiring precise timing control for NiCd and NiMH batteries within a 0.9 V to 6 V supply range. Consider the external resistor and capacitor values to set the desired charge, discharge, and self-discharge durations. Ensure the operating temperature range meets the application's environmental requirements.

Part Context

The 74LV4799 is part of the 74LV logic family, characterized by low-voltage operation and CMOS technology. It is specifically engineered for battery charging management tasks, offering integrated timing functions that reduce the need for external microcontrollers in simple charging circuits.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing circuit designs if considering alternative battery management ICs from other manufacturers.