LTC3577-4_15 Datasheet, PDF (12/52 Pages) Linear Technology – Highly Integrated Portable Product PMIC

LTC3577-3/LTC3577-4
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified
Switching from 1x to 5x Mode
Switching from Suspend Mode to
5x Mode
WALL Connect Waveform
I_LIM0/I_LIM1
5V/DIV
I_BUS
0.5A/DIV
I_BAT
0.5A/DIV
V_BAT = 3.75V
I_OUT = 50mA
R_CLPROG = 2k
R_PROG = 2k
1ms/DIV
357734 G16
I_LIM0
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
I_LIM1 = 5V
100μs/DIV
357734 G17
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
357734 G18
WALL Disconnect Waveform
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
357734 G19
Step-Down Switching Regulator 2
1.8V Output Efficiency vs I_OUT2
100
90 Burst Mode
OPERATION
80
70
PULSE-SKIPPING
60
50
40
30
20
10
0
0.01 0.1
1
10
I_OUT (mA)
V_OUT2 = 1.8V
V_IN12 = 3.8V
V_IN12 = 5V
100 1000
357734 G22
12
Oscillator Frequency
vs Temperature
2.8
2.7
2.6
2.5
2.4
V_OUT = 5V
2.3
2.2
V_OUT = 3.8V
2.1
2.0
1.9
1.8
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
357734 G20
Step-Down Switching Regulator 3
1.2V Ooutput Efficiency vs I_OUT3
100
90
Burst Mode
80 OPERATION
70
60
PULSE-SKIPPING
50
40
30
20
10
0
0.01 0.1
1
10
I_OUT (mA)
V_OUT3 = 1.2V
V_IN3 = 3.8V
V_IN3 = 5V
100 1000
357734 G23
Step-Down Switching Regulator 1
3.3V Output Efficiency vs I_OUT1
100
Burst Mode
90 OPERATION
80
70
PULSE-SKIPPING
60
50
40
30
20
10
0
0.01 0.1
1
10
I_OUT (mA)
V_OUT1 = 3.3V
V_IN12 = 3.8V
V_IN12 = 5V
100 1000
357734 G21
Step-Down Switching Regulator 3
2.5V Output Efficiency
100
90
Burst Mode
OPERATION
80
70
PULSE-SKIPPING
60
50
40
30
20
10
0
0.01 0.1
1
10
I_OUT (mA)
V_OUT3 = 2.5V
V_IN3 = 3.8V
V_IN3 = 5V
100 1000
357734 G24
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