LTC3557 Datasheet, PDF (6/28 Pages) Linear Technology – USB Power Manager with Li-Ion Charger and Three Step-Down Regulators

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