Datasheet

3
LTC1731-8.2/LTC1731-8.4
sn1731 17318fs
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
ASD
Automatic Shutdown Threshold Voltage (V
CC
– V
BAT
) Falling 30 54 90 mV
(V
CC
– V
BAT
) Rising 40 69 100 mV
V
DIS
Voltage Mode Disable Threshold Voltage V
DIS
= (V
CC
– V
TIMER
) ● 0.4 V
I
PROG
PROG Pin Current Internal Pull-Up Current, No R
PROG
2.5 µA
PROG Pin Load Regulation PROG Pin Source Current, ∆V
PROG
≤ 5mV ● 300 µA
V
PROG
PROG Pin Voltage R
PROG
=19.6k 2.457 V
I
CHRG
CHRG Pin Weak Pull-Down Current V
CHRG
= 1V 50 100 150 µA
V
CHRG
CHRG Pin Output Low Voltage I
CHRG
= 5mA 0.6 1.2 V
I
C/10
End of Charge Indication Current Level R
PROG
= 19.6k, R
SENSE
= 0.2Ω ● 25 50 100 mA
t
TIMER
TIMER Accuracy C
TIMER
= 0.01µF10%
V
CLAMP
DRV Pin Clamp Voltage V
CLAMP
= V
CC
– V
DRV
, I
DRIVE
= 50µA 6.5 V
ELECTRICAL CHARACTERISTICS
Note 2: The LTC1731E-8.2/LTC1731E-8.4 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. Consult
factory for I grade parts.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 9V unless otherwise noted.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
V
CC
(V)
9
I
TRKL
(mA)
10 11 12
1731 G01
60
55
50
45
40
R
PROG
= 19.6K
R
SENSE
= 0.2Ω
V
BAT
= 4V
T
A
= 25°
Trickle Charge Current
vs V
CC
I
TRKL
(mA)
60
55
50
45
40
TEMPERATURE (°C)
–50 100
1731 G06
050–25 25 75 125
R
PROG
= 19.6K
R
SENSE
= 0.2Ω
V
BAT
= 4V
V
CC
= 9V
V
CC
(V)
9
V
TRKL
(V)
10 11 12
1731 G08
4.96
4.95
4.94
4.93
4.92
4.91
4.90
4.89
4.88
R
PROG
= 19.6K
T
A
= 25°
Trickle Charge Current
vs Temperature
Trickle Charge Threshold Voltage
vs V
CC