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Philips |
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
Timer for NiCd and NiMH chargers
Product specification
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 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.
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.
PIN CONFIGURATION
LED 1
EN 2
EN 3
Vin 4
PWRS 5
MOLLI/SCO 6
SEL 7
GND 8
16 VCC
15 SCI
14 SCAN
13 IOSC
12 RS
11 RD
10 RC
9 DIS
SV01643
QUICK REFERENCE DATA
GND = 0V; Tamb = 25°C
SYMBOL
PARAMETER
VCC DC supply voltage
ICC Operating supply current
Df Oscillator frequency tolerance
CONDITIONS
VCC = 3.3V; self-discharge mode;
Rs = 100 kW;
C1 = 220nF
VCC = 1 to 6 V
TYPICAL
0.9
TYPICAL
36
TYPICAL
6.0
7
UNIT
V
µA
%
ORDERING INFORMATION
PACKAGES
16-Pin Plastic DIL
16-Pin Plastic SO
16-Pin Plastic SSOP Type II
16-Pin Plastic TSSOP Type I
TEMPERATURE RANGE OUTSIDE NORTH AMERICA
0°C to +70°C
74LV4799 N
0°C to +70°C
74LV4799 D
0°C to +70°C
74LV4799 DB
0°C to +70°C
74LV4799 PW
NORTH AMERICA
74LV4799 N
74LV4799 D
74LV4799 DB
74LV4799PW DH
CODE
SOT38-4
SOT109-1
SOT338-1
SOT403-1
1998 Apr 20
2 853-2058 19258
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