Datasheet

LTC4085-3/LTC4085-4
3
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SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
UVLO
Input or Output Undervoltage Lockout V
IN
Powers Part, Rising Threshold
V
OUT
Powers Part, Rising Threshold
●
●
3.6
2.75
3.8
2.95
4
3.15
V
V
∆V
UVLO
Input or Output Undervoltage Lockout V
IN
Rising – V
IN
Falling
or V
OUT
Rising – V
OUT
Falling
130 mV
Current Limit
I
LIM
Current Limit R
CLPROG
= 2k (0.1%), HPWR = 5V
R
CLPROG
= 2k (0.1%), HPWR = 0V
●
●
475
90
500
100
525
110
mA
mA
I
IN(MAX)
Maximum Input Current Limit (Note 8) 2.4 A
R
ON
ON Resistance V
IN
to V
OUT
I
OUT
= 100mA Load 215 m
V
CLPROG
CLPROG Pin Voltage R
PROG
= 2k
R
PROG
= 1k
●
●
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 50
–60
80 mV
mV
Battery Charger
V
FLOAT
Regulated Output Voltage I
BAT
= 2mA
I
BAT
= 2mA, (0°C – 85°C)
3.915
3.910
3.95
3.95
3.985
3.990
V
V
I
BAT
Current Mode Charge Current R
PROG
= 100k (0.1%), No Load
R
PROG
= 50k (0.1%), No Load
●
●
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
●
●
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
(3.95V)
●
0.085 0.1 0.11 mA/mA
I
TRIKL
Trickle Charge Current V
BAT
= 2V, R
PROG
= 100k (0.1%) 35 50 60 mA
V
TRIKL
Trickle Charge Threshold Voltage
●
2.75 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
●
60 95 130 mV
t
TIMER
TIMER Accuracy V
BAT
= 4.05V –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 m
R
DIO(ON)
ON Resistance V
BAT
to V
OUT
I
BAT
= 600mA 215 m
V
FWD
Voltage Forward Drop (V
BAT
– V
OUT
)I
BAT
= 5mA
I
BAT
= 100mA
I
BAT
= 600mA
●
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
The ● indicates specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C (Note 5). V
IN
= 5V, V
BAT
= 3.7V, HPWR = 5V, WALL = 0V, R
PROG
= 100k,
R
CLPROG
= 2k, unless otherwise noted.
ELECTRICAL CHARACTERISTICS