Datasheet

LTC4085
3
4085fd
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CLPROG
CLPROG Pin Voltage R
PROG
= 2k
R
PROG
= 1k
l
l
0.98
0.98
1
1
1.02
1.02
V
V
I
SS
Soft-Start Inrush Current IN or OUT 5 mA/μs
V
CLEN
Input Current Limit Enable Threshold
Voltage
(V
IN
– V
OUT
) V
IN
Rising
(V
IN
– V
OUT
) V
IN
Falling
20
–80
50
–60
80
–20
mV
mV
Battery Charger
V
FLOAT
Regulated Output Voltage I
BAT
= 2mA
I
BAT
= 2mA, (0°C to 85°C)
4.165
4.158
4.2
4.2
4.235
4.242
V
V
I
BAT
Current Mode Charge Current R
PROG
= 100k (0.1%), No Load
R
PROG
= 50k (0.1%), No Load
l
l
465
900
500
1000
535
1080
mA
mA
I
BAT(MAX)
Maximum Charge Current (Note 8) 1.5 A
V
PROG
PROG Pin Voltage R
PROG
= 100k
R
PROG
= 50k
l
l
0.98
0.98
1
1
1.02
1.02
V
V
k
EOC
Ratio of End-of-Charge Current to
Charge Current
V
BAT
= V
FLOAT
(4.2V)
l
0.085 0.1 0.11 mA/mA
I
TRIKL
Trickle Charge Current V
BAT
= 2V, R
PROG
= 100k (0.1%) 40 50 60 mA
V
TRIKL
Trickle Charge Threshold Voltage
l
2.8 2.9 3 V
V
CEN
Charger Enable Threshold Voltage (V
OUT
– V
BAT
) Falling; V
BAT
= 4V
(V
OUT
– V
BAT
) Rising; V
BAT
= 4V
55
80
mV
mV
V
RECHRG
Recharge Battery Threshold Voltage V
FLOAT
– V
RECHRG
l
65 100 135 mV
t
TIMER
TIMER Accuracy V
BAT
= 4.3V -10 10 %
Recharge Time Percent of Total Charge Time 50 %
Low-Battery Trickle Charge Time Percent of Total Charge Time, V
BAT
< 2.8V 25 %
T
LIM
Junction Temperature in Constant
Temperature Mode
105 °C
Internal Ideal Diode
R
FWD
Incremental Resistance, V
ON
Regulation I
BAT
= 100mA 125
mΩ
R
DIO(ON)
ON Resistance V
BAT
to V
OUT
I
BAT
= 600mA 215
mΩ
V
FWD
Voltage Forward Drop (V
BAT
– V
OUT
)I
BAT
= 5mA
I
BAT
= 100mA
I
BAT
= 600mA
l
10 30
55
160
50 mV
mV
mV
V
OFF
Diode Disable Battery Voltage 2.8 V
I
FWD
Load Current Limit, for V
ON
Regulation 550 mA
I
D(MAX)
Diode Current Limit 2.2 A
External Ideal Diode
V
FWD,EDA
External Ideal Diode Forward Voltage V
GATE
= 1.85V; I
GATE
= 0 20 mV
Logic
V
OL
Output Low Voltage, CHRG, ACPR I
SINK
= 5mA
l
0.1 0.25 V
V
IH
Input High Voltage SUSP, HPWR Pin
l
1.2 V
V
IL
Input Low Voltage SUSP, HPWR Pin
l
0.4 V
I
PULLDN
Logic Input Pull-Down Current SUSP, HPWR 2 μA
The l indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
BAT
= 3.7V, HPWR = 5V, WALL = 0V, R
PROG
= 100k,
R
CLPROG
= 2k, unless otherwise noted.
ELECTRICAL CHARACTERISTICS