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74LV4799

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 t...

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SeekIC No. : 004251182 Detail

74LV4799: 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-m...

74LV4799 Data Sheet

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Part Number:
74LV4799
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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


Application

• 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. 


Pinout

Connection Diagram


Specifications

SYMBOL PARAMETER
CONDITIONS
MIN
MAX
Unit
VCC DC supply voltage
-0.5
+7.0
V
IIK DC input diode current pins 4, 5 and 9
VI < 0.5 or VI > 12 V
+20
mA
DC input diode current pins 7, 13, 14 and 15

VI < 0.5 or VI > VCC + 0.5 V
+20
NON repetitive peak DC input diode current pin 9

VI > 10 V and t < 10 s; see note 1
10
VI DC input voltage range pins 4, 5 and 9
-0.5
+12
V
DC input voltage range pins 7, 13, 14 and 15
-0.5
VCC + 0.5
V
IOK DC output diode current pins 1, 2, 3 and 6
VO < 0.5 V
-20
mA
IO DC output sink current pins 1, 2, 3 and 6

VO > 0 V
-25
mA
IOK DC output diode current pins 10, 11 and 12

VO < 0.5 or VO > VCC + 0.5 V
±20
mA
IO DC output sink or source current pins 10, 11 and 12
0.5 V < VO < VCC + 0.5 V
±25
mA
IGND, ICC DC GND or VCC current
±50
mA
Tstg storage temperature range
-65
+150
PTOT Power dissipation per package
plastic DIL
plastic mini-pack (SO)
plastic shrink mini-pack (SSOP and TSSOP)
for temperature range: 40 to +125°C
above +70°C derate linearly with 12 mW/K
above +70°C derate linearly with 8 mW/K
above +60°C derate linearly with 5.5 mW/K
750
500
400
mW

NOTES:
1. In applications where a motor is present, the input voltage may exceed the maximum VI, level of 10 V at the DIS nput for a very short period when the motor is switched off.
2. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and unctional operation of the device at these or any other conditions beyond those under "recommended operating conditions" is not implied. Exposure to absolute maximum rated conditions for extended periods may affect device eliability.
3. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.




Description

The 74LV4799 is a low-voltage Si-gate CMOS control IC for battery management. The 74LV4799 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.




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