Datasheet

LTC4055/LTC4055-1
6
4055fb
TYPICAL PERFORMANCE CHARACTERISTICS
Regulated Output Voltage-
Recharge Threshold Voltage
vs Temperature
Battery Regulated Output (Float)
Voltage vs Supply Voltage
Battery Current and Voltage
vs Time (LTC4055)
Charging from USB, I
BAT
vs V
BAT
(LTC4055)
Charging from USB, Low Power,
I
BAT
vs V
BAT
(LTC4055)
Undervoltage Current Limit,
Charging from V
IN
, I
BAT
vs V
IN
Charge Current vs Temperature
(Thermal Regulation)
Ideal Diode Forward Voltage
vs Current and Temperature
Ideal Diode Forward Voltage and
Resistance vs Current
TEMPERATURE (°C)
–50
V
FLOAT
-V
RECHARGE
(V)
95
100
105
25
75
4055 G10
90
85
80
–25 0 50
110
115
120
100
V
IN
= 5V
V
IN
(V)
4.5
V
FLOAT
(V)
4.2
4.1
5.25
5.75
4055 G11
4.0
4.75 5 5.5
4.3
6
T
A
= 25°C
LTC4055-1
LTC4055
TIME (MINUTES)
0
I
BAT
(mA)
V
BAT
AND V
CHRG
(V)
200
400
600
100
300
500
0
2
4
6
1
3
5
40 80 120 160
4055 G12
200200 60 100 140 180
CHRG
V
BAT
I
BAT
0.8AHr CELL
V
IN
= 5V
T
A
= 25°C
R
PROG
= 105k
V
BAT
(V)
0
0
I
BAT
(mA)
100
300
400
500
1
2
2.5 4.5
4055 G13
200
0.5 1.5
3
3.5
4
600
V
IN
= 5V
V
OUT
= NO LOAD
R
PROG
= 100k
R
CLPROG
= 100k
HPWR = 1
T
A
= 25°C
V
BAT
(V)
0
0
I
BAT
(mA)
20
60
80
100
1
2
2.5 4.5
4055 G14
40
0.5 1.5
3
3.5
4
V
IN
= 5V
V
OUT
= NO LOAD
R
PROG
= 100k
R
CLPROG
= 100k
HPWR = 0
T
A
= 25°C
V
IN
(V)
4.260
I
BAT
(A)
0.8
1.0
1.2
4.420
4055 G15
0.6
0.4
0
4.300
4.340
4.380
0.2
1.6
1.4
R
PROG
= 34k
R
PROG
= 100k
R
PROG
= 100k
HPWR = 0
R
PROG
= 50k
T
A
= 25°C
TEMPERATURE (°C)
–50
0
I
BAT
(A)
0.1
0.3
0.4
0.5
1.0
0.7
0
50
75
4055 G16
0.2
0.8
0.9
0.6
–25
25
100
125
V
IN
= 5V
V
BAT
= 3.5V
Q
JA
= 37°C/W
R
PROG
= 50k
R
PROG
= 100k
V
FWD
(mV)
0
I
OUT
(mA)
600
800
1000
160
4055 G17
400
200
500
700
900
300
100
0
4020
8060
120 140 180
100
200
V
BAT
= 3.5V
V
IN
= 0V
–50°C
125°C
25°C
0°C
75°C
V
FWD
(mV)
0
I
OUT
(mA), R
DIO
(mΩ)
600
800
1000
160
4055 G18
400
200
500
700
900
300
100
0
4020
8060
120 140 180
100
200
V
BAT
= 3.5V
V
IN
= 0V
T
A
= 25°C
R
FWD
R
DIO(ON)