LTC3557_15 Datasheet, PDF (7/28 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
I_BAT vs V_BAT
600
500
400
300
200
V_BUS = 5V
100
10x MODE
R_PROG = 2k
R_CLPROG = 2k
0
2.0 2.4 2.8 3.2 3.6 4.0 4.4
V_BAT (V)
35571 G10
Input Connect Waveform
Forward Voltage vs Ideal Diode
Current (No External FET)
0.25
V_BUS = 0V
T_A = 25°C
V_BAT = 3.2V
0.20
V_BAT = 3.6V
V_BAT = 4.2V
0.15
0.10
0.05
0
0 0.2 0.4 0.6 0.8 1.0 1.2
I_BAT (A)
35571 G11
Input Disconnect Waveform
Forward Voltage
vs Ideal Diode Current
(with Si2333DS External FET)
40
V_BAT = 3.8V
35 ^VBUS ^{= 0V}
T_A = 25°C
30
25
20
15
10
5
0
0
0.2
0.4
0.6
0.8 1.0
I_BAT (A)
35571 G12
Switching from 1x to 5x Mode
V_BUS
5V/DIV
V_OUT
5V/DIV
I_BUS
0.5A/DIV
I_BAT
0.5A/DIV
V_BAT = 3.75V
I_OUT = 100mA
R_CLPROG = 2k
R_PROG = 2k
1ms/DIV
35571 G25
V_BUS
5V/DIV
V_OUT
5V/DIV
I_BUS
0.5A/DIV
I_BAT
0.5A/DIV
V_BAT = 3.75V
I_OUT = 100mA
R_CLPROG = 2k
R_PROG = 2k
1ms/DIV
ILIM0/ILIM1
5V/DIV
I_BUS
0.5A/DIV
I_BAT
0.5A/DIV
35571 G26
V_BAT = 3.75V
I_OUT = 50mA
R_CLPROG = 2k
R_PROG = 2k
1ms/DIV
35571 G27
Switching from Suspend Mode
to 5x Mode
WALL Connect Waveform
WALL Disconnect Waveform
ILIM0
5V/DIV
V_OUT
5V/DIV
I_BUS
0.5A/DIV
I_BAT
0.5A/DIV
V_BAT = 3.75V
I_OUT = 100mA
R_CLPROG = 2k
R_PROG = 2k
ILIM1 = 5V
100μs/DIV
WALL
5V/DIV
V_OUT
5V/DIV
I_WALL
0.5A/DIV
I_BAT
0.5A/DIV
35571 G28
V_BAT = 3.75V
I_OUT = 100mA
R_PROG = 2k
1ms/DIV
35571 G29
WALL
5V/DIV
V_OUT
5V/DIV
I_WALL
0.5A/DIV
I_BAT
0.5A/DIV
V_BAT = 3.75V
I_OUT = 100mA
R_PROG = 2k
1ms/DIV
35571 G30
35571fc
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