Datasheet

LTC4055/LTC4055-1
3
4055fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN1
= V
IN2
= 5V, V
BAT
= 3.5V, HPWR = 5V, WALL = 0V,
R
PROG
= R
CLPROG
= 100k, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Limit
I
LIM
Current Limit R
CLPROG
= 100k, HPWR = 5V
R
CLPROG
= 100k, HPWR = 0V
l
l
465
89
490
97
515
105
mA
mA
R
ON
ON Resistance V
IN
to V
OUT
HPWR = 5V, 400mA Load
HPWR = 0V, 80mA Load
0.2
0.2
Ω
Ω
V
PROG
Programming Pin Voltage
(PROG, CLPROG)
R
CLPROG
= R
PROG
= 100k
R
CLPROG
= R
PROG
= 50k
l
l
0.98
0.98
1.000
1.000
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 V
IN
Rising
l
3.5 3.8 4 V
ΔV
CLEN
Input Current Limit Enable Threshold V
IN
Rising – V
IN
Falling 125 mV
V
ALEN
Automatic Limit Enable Threshold
Voltage
(V
IN
– V
OUT
) V
IN
Rising
(V
IN
– V
OUT
) V
IN
Falling
25
–75
50
–50
75
–25
mV
mV
Battery Charger
V
FLOAT
Regulated BAT Voltage (0°C to 85°C) I
BAT
= 2mA (LTC4055)
I
BAT
= 2mA (LTC4055)
l
4.165
4.158
4.200
4.200
4.235
4.242
V
V
(0°C to 85°C). I
BAT
= 2mA (LTC4055-1)
I
BAT
= 2mA (LTC4055-1)
l
4.066
4.059
4.100
4.100
4.134
4.141
V
V
I
BAT
Current Mode Charge Current R
PROG
= 100k, HPWR = 5V, No Load
R
PROG
= 100k, HPWR = 0V, No Load
R
PROG
= 100k, V
OUT
= 5V, V
IN
= 0V,
V
WALL
= 2V
R
PROG
= 50k, HPWR = 5V, No Load
R
PROG
= 50k, V
OUT
= 5V, V
IN
= 0V,
V
WALL
= 2V
l
l
l
l
l
445
45
445
900
900
485
80
485
980
980
525
110
525
1060
1060
mA
mA
mA
mA
mA
I
BAT(MAX)
Maximum Charge Current (Note 8) 1 A
ΔI
B
/ΔI
O
Charge Current Load Dependency ΔI
BAT
/ΔI
OUT
, I
OUT
= 100mA
l
0.95 1 1.05 mA/mA
I
TRKL
Trickle-Charge Current V
BAT
= 2V, R
PROG
= 100k 30 45 60 mA
V
TRKL
Trickle-Charge Threshold Voltage V
BAT
Rising
l
2.7 2.85 3 V
V
CENI
Input Charger Enable Threshold
Voltage
(V
IN
– V
BAT
) High to Low
(V
IN
– V
BAT
) Low to High
70
80
mV
mV
V
CENO
Output Charger Enable Threshold
Voltage
(V
OUT
– V
BAT
) High to Low
(V
OUT
– V
BAT
) Low to High
70
80
mV
mV
V
UVCL
Input/Output Undervoltage Current Limit I
BAT
= I
CHG
/2
l
4.23 4.3 4.37 V
V
RECHRG
Recharge Battery Threshold Voltage V
FLOAT
– V
RECHRG
l
65 100 135 mV
t
TIMER
TIMER Accuracy C
TIMER
= 0.1μF ±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
Ideal Diode
R
FWD
On Resistance, V
ON
Regulation V
BAT
= 3.5V, 100mA Load 0.1 Ω
R
DIO,ON
On Resistance V
BAT
to V
OUT
V
BAT
= 3.5V, 600mA Load 0.2 Ω
V
FWD
Voltage Forward Drop (V
BAT
– V
OUT
)V
BAT
= 3.5V, 5mA Load
V
BAT
= 3.5V, 100mA Load
V
BAT
= 3.5V, 600mA
l
10 30
55
120
50 mV
mV
mV
V
OFF
Diode Disable Battery Voltage V
BAT
Falling 2.8 V
I
FWD
Load Current Limit for V
ON
Regulation V
IN
= 3.5V 550 mA
I
MAX
Diode Current Limit V
BAT
= 3.5V, V
OUT
= 2.8V, Pulsed with
10% Duty Cycle
1.4 1.8 2.2 A