Datasheet

3
LTC4068-4.2/LTC4068X-4.2
406842fa
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LTC4068E-4.2/LTC4068XE-4.2 are guaranteed to meet
performance specifications from 0°C to 70°C. Specifications over the
–40°C to 85°C operating temperature range are assured by design,
characterization and correlation with statistical process controls.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
T
LIM
Junction Temperature in Constant 120 °C
Temperature Mode
R
ON
Power FET “ON” Resistance 600 mΩ
(Between V
CC
and BAT)
t
SS
Soft-Start Time I
BAT
= 0 to I
BAT
=1000V/R
PROG
100 µs
t
RECHARGE
Recharge Comparator Filter Time V
BAT
High to Low 0.75 2 4.5 ms
t
TERM
Termination Comparator Filter Time I
BAT
Drops Below Charge Termination Threshold 400 1000 2500 µs
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
Note 3: Failure to solder the exposed backside of the package to the PC
board will result in a thermal resistance much higher than 40°C/W.
Note 4: Supply current includes PROG pin current and ITERM pin current
(approximately 100µA each) but does not include any current delivered to
the battery through the BAT pin (approximately 100mA).
Note 5: This parameter is not applicable to the LTC4068X.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
PROG Pin Voltage vs Supply
Voltage (Constant Current Mode)
V
CC
(V)
4
0.985
V
PROG
(V)
0.990
0.995
1.000
1.005
1.015
4.5
5 5.5 6
405842 G01
6.5 7
1.010
V
CC
= 5V
V
BAT
= 4V
T
A
= 25°C
R
PROG
= 10k
TEMPERATURE (°C)
–50
V
PROG
(V)
0.9975
1.0000
1.0025
25
75
405842 G02
0.9950
0.9925
0.9900
–25 0 50
1.0050
1.0075
1.0100
100
V
CC
= 5V
V
BAT
= 4V
R
PROG
= 10k
V
PROG
(V)
0
0
I
BAT
(mA)
100
200
300
400
600
0.2
0.4 0.6 0.8
405842 G03
1 1.2
500
V
CC
= 5V
T
A
= 25°C
R
PROG
= 2k
R
TERM
= 2k
PROG Pin Voltage
vs Temperature
Charge Current
vs PROG Pin Voltage