74LV4799PWDH データシートの表示（PDF） - Philips Electronics
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74LV4799PWDH Datasheet PDF : 18 Pages
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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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