Datasheet

LTC3557/LTC3557-1
6
35571fc
TYPICAL PERFORMANCE CHARACTERISTICS
Input Supply Current
vs Temperature
Input Supply Current
vs Temperature (Suspend Mode)
Battery Drain Current
vs Temperature
Input Current Limit
vs Temperature
Input R
ON
vs Temperature
Charge Current vs Temperature
(Thermal Regulation)
Battery Current and Voltage
vs Time (LTC3557)
V
FLOAT
Load Regulation
Battery Regulation (Float)
Voltage vs Temperature
T
A
= 25°C unless otherwise specifi ed
TEMPERATURE (°C)
–50
I
VBUS
(mA)
0.7
25
35571 G01
0.4
0.2
–25 0 50
0.1
0
0.8
0.6
0.5
0.3
75 100 125
V
BUS
= 5V
1x MODE
TEMPERATURE (°C)
–50 –25
0
I
VBUS
(mA)
0.04
0.10
0
50
75
35571 G02
0.02
0.08
0.06
25
100
125
V
BUS
= 5V
TEMPERATURE (°C)
–50
0
I
BAT
(mA)
0.02
0.06
0.08
0.10
0.20
0.14
0
50
75
35571 G03
0.04
0.16
0.18
0.12
–25
25
100
125
V
BAT
= 3.8V
MODE = 3.8V
3 BUCKS ENABLED
N0 BUCKS ENABLED
2 BUCKS ENABLED
1 BUCK ENABLED
TEMPERATURE (°C)
–50
I
VBUS
(mA)
400
1000
1100
1200
0
50
75
35571 G04
200
100
800
600
300
900
0
700
500
–25
25
100
125
V
BUS
= 5V
R
CLPROG
= 2.1k
10x MODE
5x MODE
1x MODE
TEMPERATURE (°C)
–50
0
R
ON
(m)
100
140
160
180
300
240
0
50
75
35571 G05
120
260
280
220
–25
25
100
125
I
OUT
= 400mA
V
BUS
= 4.5V
V
BUS
= 5.5V
V
BUS
= 5V
TEMPERATURE (°C)
–50
I
BAT
(mA)
400
500
600
25 75
35571 G06
300
200
–25 0
50 100 125
100
0
V
BUS
= 5V
10x MODE
R
PROG
= 2k
TIME (HOUR)
0
0
I
BAT
(mA)
V
BAT
AND V
CHRG
(V)
100
200
300
400
600
1
234
35571 G07
56
500
0
1
2
3
4
6
V
BAT
I
BAT
C/10
5
1450mAhr
CELL
V
BUS
= 5V
R
PROG
= 2k
R
CLPROG
= 2k
CHRG
SAFETY
TIMER
TERMINATION
I
BAT
(mA)
0
V
FLOAT
(V)
4.12
4.14
4.16
600
1000
35571 G08
4.10
4.08
4.06
200 400 800
4.18
4.20
4.22
V
BUS
= 5V
10x MODE
LTC3557
LTC3557-1
TEMPERATURE (°C)
–50
V
FLOAT
(V)
4.06
4.10
4.12
4.14
4.22
4.18
0
50
75
35571 G09
4.08
4.20
4.16
–25
25
100
125
I
BAT
= 2mA
LTC3557
LTC3557-1