LTC1731-8.2/LTC1731-8.4
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 9V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
(V – V ) Falling
MIN
TYP
MAX
UNITS
V
Automatic Shutdown Threshold Voltage
30
40
54
69
90
100
mV
mV
ASD
CC
BAT
(V – V ) Rising
CC
BAT
V
Voltage Mode Disable Threshold Voltage
PROG Pin Current
V
= (V – V )
TIMER
●
●
0.4
V
µA
µA
V
DIS
DIS
CC
I
Internal Pull-Up Current, No R
2.5
PROG
PROG
PROG Pin Load Regulation
PROG Pin Voltage
PROG Pin Source Current, ∆V
≤ 5mV
300
50
PROG
V
R
=19.6k
= 1V
2.457
100
0.6
50
PROG
PROG
CHRG
CHRG
I
CHRG Pin Weak Pull-Down Current
CHRG Pin Output Low Voltage
End of Charge Indication Current Level
TIMER Accuracy
V
150
1.2
µA
V
CHRG
V
I
= 5mA
CHRG
I
t
R
= 19.6k, R
= 0.2Ω
SENSE
●
25
100
mA
%
C/10
PROG
TIMER
CLAMP
C
V
= 0.01µF
= V – V , I = 50µA
DRV DRIVE
10
TIMER
V
DRV Pin Clamp Voltage
6.5
V
CLAMP
CC
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Trickle Charge Current
vs Temperature
Trickle Charge Threshold Voltage
vs VCC
Trickle Charge Current
vs VCC
60
55
50
45
40
60
55
50
45
40
4.96
4.95
4.94
4.93
4.92
4.91
4.90
4.89
4.88
R
R
V
= 19.6K
R
R
V
= 19.6K
R
A
= 19.6K
PROG
PROG
PROG
= 0.2Ω
= 0.2Ω
T
= 25°
SENSE
SENSE
= 4V
= 4V
BAT
BAT
V
= 9V
T
= 25°
CC
A
9
10
11
12
–25
0
25
50
75
125
9
10
11
12
–50
100
V
CC
(V)
V
(V)
CC
TEMPERATURE (°C)
1731 G01
1731 G08
1731 G06
sn1731 17318fs
3
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