Philips Semiconductors Product specification
74LV4799Timer for NiCd and NiMH chargers
2
1998 Apr 20 853-2058 19258
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.
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
SV01643
1
2
3
4
5
6
LED
EN
EN
V
in
PWRS
MOLLI
/SCO
V
CC
SCI
SCAN
16
15
14
13
12
11
7
8
GND
R
C
DIS
10
9
SEL
I
OSC
R
S
R
D
QUICK REFERENCE DATA
GND = 0V; T
amb
= 25°C
SYMBOL PARAMETER CONDITIONS TYPICAL TYPICAL TYPICAL UNIT
V
CC
DC supply voltage 0.9 6.0 V
I
CC
Operating supply current
V
CC
= 3.3V; self-discharge mode;
R
s
= 100 k;
C
1
= 220nF
36 µA
f
Oscillator frequency tolerance V
CC
= 1 to 6 V 7 %
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA CODE
16-Pin Plastic DIL 0°C to +70°C 74LV4799 N 74LV4799 N SOT38-4
16-Pin Plastic SO 0°C to +70°C 74LV4799 D 74LV4799 D SOT109-1
16-Pin Plastic SSOP Type II 0°C to +70°C 74LV4799 DB 74LV4799 DB SOT338-1
16-Pin Plastic TSSOP Type I 0°C to +70°C 74LV4799 PW 74LV4799PW DH SOT403-1
