74LV4799DB,112

Overview

The 74LV4799DB,112 is a low-voltage Si-gate CMOS control IC designed for NiCd and NiMH battery management. It operates on a supply voltage range of 0.9 V to 6 V with an operating supply current of 36 µA. The device features an integrated precision oscillator, a 17-stage divider, and a 10-stage up/down counter to measure charge, discharge, and self-discharge times. It supports automatic switch-over to trickle charge and provides LED and MOLLI status outputs. The component is housed in a 16-SSOP package.

Feature Summary

• Wide supply voltage range of 0.9 V to 6 V supporting 1 to 4-cell applications
• On-chip timer calculates battery capacity by measuring charge, discharge, and self-discharge times
• Automatic switch-over to trickle charge after completion of the charge time
• Battery status indication via LED output (charging/full) and MOLLI output (battery-low)

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

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for obsolescence notices, as this part may be discontinued. Ensure the 16-SSOP package type matches the design requirements before procurement.

Selection Notes

Select based on the required supply voltage range between 0.9 V and 6 V. Consider the external timing components connected to RC, RD, and RS pins to set specific charge and discharge durations. Verify that the 100 kHz maximum frequency at the power sense input meets the charger interface requirements.

Part Context

This component belongs to the 74LV series of low-voltage CMOS logic devices manufactured by NXP USA Inc. It is specifically engineered for battery charging applications, utilizing time-measurement principles for accurate capacity calculation. The DB suffix indicates the 16-pin Plastic SSOP Type II package.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.