74LV4799

General 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 counter.

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
• I CC category: non-standard.

Products/packages

Pricing/ordering/availability

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.

Block diagrams/pinning

Parametrics/similar products

Similar products

74LV4799 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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