Datasheet

LTC4098/LTC4098-1
6
40981fc
Battery Charge Current
vs Temperature
Normalized Battery Charger Float
Voltage vs Temperature
V
OUT
Voltage vs V
OUT
Current
in Suspend
V
BUS
Current vs V
OUT
Current
in Suspend
Automatic Battery Charge
Current Reduction
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE (V)
4.0
4.5
5.0
2
40981 G14
3.5
3.0
2.5
0.5
1
1.5
2.5
SUSPEND HIGH
SUSPEND LOW
V
BUS
= 5V
BAT = 3.3V
R
CLPROG
= 3.01k
OUTPUT CURRENT (mA)
0
V
BUS
CURRENT (mA)
1.5
2.0
2.5
2
40981 G15
1.0
0.5
0
0.5
1
1.5
2.5
SUSPEND HIGH
SUSPEND LOW
V
BUS
= 5V
BAT = 3.3V
R
CLPROG
= 3.01k
TEMPERATURE (°C)
–40
0
CHARGE CURRENT (mA)
100
200
300
400
040
80
120
40981 G17
500
600
–20 20
60
100
THERMAL REGULATION
R
PROG
= 2k
TEMPERATURE (°C)
–40
NORMALIZED FLOAT VOLTAGE
60
40981 G18
0.997
–15
10
35
85
1.003
1.002
1.001
1.000
0.999
0.998
V
OUT
(V)
0
% PROGRAMMED CHARGE CURRENT
20
40
60
80
100
120
3.2 3.3 3.4 3.5
40981 G16
3.6
Battery Charging Efficiency vs
Battery Voltage with No External
Load (P
BAT
/P
VBUS
)
V
BUS
Current vs V
BUS
Voltage
(Suspend)
BATTERY VOLTAGE (V)
2.7
EFFICIENCY (%)
80
90
3.9
40981 G12
70
60
3.0
3.3
3.6
4.2
100
R
CLPROG
= 3.01k
R
PROG
= 1k
I
VOUT
= 0mA
LTC4098
1x CHARGING
EFFICIENCY
5x CHARGING
EFFICIENCY
V
BUS
VOLTAGE (V)
1
V
BUS
CURRENT (μA)
30
40
50
5
40981 G13
20
10
0
2
3
4
6
BAT = 3.8V
I
VOUT
= 0mA
T
A
= 25°C unless otherwise noted.
TYPICAL PERFORMANCE CHARACTERISTICS
PowerPath Switching Regulator
Efficiency vs Output Current
Battery Drain Current
vs Battery Voltage
BATTERY VOLTAGE (V)
2.7
0
BATTERY CURRENT (μA)
5
10
15
20
25
30
3.0 3.3 3.6 3.9
40981 G10
4.2
V
BUS
= 0V
V
BUS
= 5V
(SUSPEND MODE)
I
VOUT
= 0μA
OUTPUT CURRENT (A)
0.01
40
EFFICIENCY (%)
50
60
70
80
100
0.1 1
40981 G11
90
5x, 10x MODE
1x MODE
BAT = 3.8V