INTEGRATED CIRCUITS
74LV4799 Timer for NiCd and NiMH chargers
Product specification Supersedes data of 1998 Apr 07 IC24...
INTEGRATED CIRCUITS
74LV4799 Timer for NiCd and NiMH chargers
Product specification Supersedes data of 1998 Apr 07 IC24 Data Handbook 1998 Apr 20
Philips Semiconductors
Philips Semiconductors
Product specification
Timer for NiCd and NiMH chargers
74LV4799
FEATURES
applications
Wide supply
voltage range of 0.9 V to 6 V allows 1 to 4-cell 10 V allowed on special inputs Supports virtually all battery chargers, including switched-mode On-chip timer calculates the actual capacity of the battery by Automatic switch-over to trickle charge after completion of the Can be adjusted for use with different types of batteries:
– Charge time: 4 to 16 hours – Discharge time: 15 minutes to 4.7 hours – Self-discharge time: 50 to 100 days charge time measuring the charger time, discharge time and self-discharge time power supplies
DESCRIPTION
The 74LV4799 is a low-
voltage Si-gate
CMOS control IC for battery management. It consists of:
17-stage divider 10-stage up/down counter Control logic Integrated precision oscillator (using external timing components) Automatic power-ON reset Scan test facilities Battery charging/full indication output (LED) Battery-low indication output (MOLLI) Open-drain-N outputs for driving the load transistor
Battery management with the 74LV4799 is based on the principle of time measurement. It measures the charge time, discharge time and self-discharge time by means of a very accurate on-chip oscillator, a divider and an up/down...