74LV4799PW,112

Overview

The 74LV4799PW,112 is a low-voltage Si-gate CMOS control IC designed for battery management in NiCd and NiMH chargers. It operates on 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 alerts. It supports various charger types, including switched-mode power supplies, with configurable timing parameters.

Feature Summary

• Wide supply voltage range of 0.9 V to 6 V allows operation in 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
• Includes LED output for charging/full indication and MOLLI output for battery-low indication

Applications

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

Procurement Notes

Verify the package type matches the PW suffix (16-Pin Plastic TSSOP Type I). Confirm the temperature range is commercial (0°C to +70°C). Check RoHS compliance status as per the specific revision. Ensure the ordering code includes the correct suffix for the intended packaging configuration.

Selection Notes

Select external resistor and capacitor values carefully to set the desired charge, discharge, and self-discharge times within the specified ranges. Consider the oscillator frequency tolerance of ±7% when designing for precise timing requirements. Ensure the input voltage levels are compatible with the logic family used in the system. Verify that the load connected to the EN outputs does not exceed the current ratings.

Part Context

The 74LV4799 is part of the Philips Semiconductors (now NXP) product line, specifically designed for consumer electronics battery management. It supersedes earlier data from April 1998. The device is manufactured using low-voltage Si-gate CMOS technology, ensuring low power consumption and compatibility with various low-voltage logic families.

Replacement Considerations

No direct public substitute part numbers are listed in the provided documentation. When selecting a replacement, ensure the new component supports the same voltage range (0.9 V to 6 V), has similar timing accuracy, and offers comparable pinout functionality for charge/discharge control.