74LV4799DB中文资料飞利浦数据手册PDF规格书

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

FEATURES

• Wide supply voltage range of 0.9 V to 6 V allows 1 to 4-cell

applications

• 10 V allowed on special inputs

• Supports virtually all battery chargers, including switched-mode

power supplies

• On-chip timer calculates the actual capacity of the battery by

measuring the charger time, discharge time and self-discharge time

• Automatic switch-over to trickle charge after completion of the

charge time

• 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

• Battery status indication included:

– LED output for charging/full indication

– MOLLI output for battery-low indication

• LED mode select allows two different methods of indication

• Automatic power-ON reset

• Low-power consumption

• Requires only a few peripheral components

• Very accurate on-chip oscillator

• Scan test facilities included

• ICC category: non-standard.

APPLICATIONS

• Time-controlled NiCd and NiMH low-current chargers

• Domestic appliances such as rechargeable battery shavers,

electric toothbrushes etc.

• Portable equipment such as notebook PCs, laptop PCs, camera

flash units etc.

• Personal communications like cordless telephones, personal

mobile radios, pagers, etc.