LTC3555 Datasheet, PDF (8/32 Pages) Linear Technology – High Effi ciency USB Power Manager + Triple Step-Down DC/DC

LTC3555/LTC3555-X
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage vs Load Current in
Suspend
5.0
4.5
V_BUS Current vs Load Current in
Suspend
0.5
V_BUS = 5V
BAT = 3.3V
0.4 ^{RCLPROG = 3k}
4.0
0.3
3.5
0.2
3.0 _{VBUS = 5V}
BAT = 3.3V
R_CLPROG = 3k
2.5
0
0.1 0.2 0.3 0.4 0.5
LOAD CURRENT (mA)
3555 G10
Battery Charge Current vs
Temperature
600
500
400
THERMAL REGULATION
300
200
100
R_PROG = 2k
10x MODE
0
–40 –20 0 20 40 60 80
TEMPERATURE (°C)
100 120
3555 G13
Oscillator Frequency vs
Temperature
2.6
2.4
BAT = 3.6V
V_BUS = 5V
V_BUS = 0V
2.2
2.0
1.8
–40
BAT = 3V
V_BUS = 0V
BAT = 2.7V
V_BUS = 0V
–15 10
35
60
85
TEMPERATURE (°C)
3555 G16
0.1
0
0
0.1 0.2 0.3 0.4 0.5
LOAD CURRENT (mA)
3555 G11
Normalized Battery Charger Float
Voltage vs Temperature
1.001
1.000
0.999
0.998
0.997
0.996
–40
–15 10
35
60
85
TEMPERATURE (°C)
3555 G14
V_BUS Quiescent Current vs
Temperature
15
V_BUS = 5V
I_VOUT = 0μA
5x MODE
12
9
1x MODE
6
3
–40 –15 10
35
60
85
TEMPERATURE (°C)
3555 G17
8
3.3V LDO Output Voltage vs Load
Current, V_BUS = 0V
3.4
BAT = 3.9V, 4.2V
BAT = 3.5V
BAT = 3.4V
BAT = 3.6V
3.2
3.0
2.8 ^{BAT = 3V}
BAT = 3.1V
BAT = 3.2V
2.6
0
BAT = 3.3V
5
10
15
20
25
LOAD CURRENT (mA)
3555 G12
Low-Battery (Instant-On) Output
Voltage vs Temperature
3.68
BAT = 2.7V
I_VOUT = 100mA
5x MODE
3.66
3.64
3.62
3.60
–40
–15 10
35
60
85
TEMPERATURE (°C)
3555 G15
V_BUS Quiescent Current in
Suspend vs Temperature
70
I_VOUT = 0μA
60
50
40
30
–40
–15 10
35
60
85
TEMPERATURE (°C)
3555 G18
3555fd