LTC3577 Datasheet, PDF (12/52 Pages) Linear Technology – Highly Integrated 6-Channel Portable PMIC

LTC3577/LTC3577-1
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified
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
3577 G16
V_BAT = 3.75V
I_OUT = 100mA
R_PROG = 2k
1ms/DIV
WALL
5V/DIV
V_OUT
5V/DIV
I_WALL
0.5A/DIV
I_BAT
0.5A/DIV
3577 G17
V_BAT = 3.75V
I_OUT = 100mA
R_PROG = 2k
1ms/DIV
3577 G18
Oscillator Frequency
vs Temperature
2.5
2.4
2.3
V_IN = 3.8V
2.2
V_IN = 5V
2.1
2.0
1.9
V_IN = 2.9V
1.8
V_IN = 2.7V
1.7
1.6
1.5
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
3577 G19
Step-Down Switching Regulator 3
1.2V Output Efficiency vs I_OUT3
100
90
Burst Mode
80 OPERATION
70
60
PULSE-SKIPPING MODE
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
3577 G22
12
Step-Down Switching Regulator 1
3.3V Output Efficiency vs I_OUT1
100
Burst Mode
90 OPERATION
80
70
PULSE-SKIPPING MODE
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
3577 G20
Step-Down Switching Regulator 3
2.5V Output Efficiency vs I_OUT3
100
90
Burst Mode
OPERATION
80
70
PULSE-SKIPPING MODE
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
3577 G23
Step-Down Switching Regulator 2
1.8V Output Efficiency vs I_OUT2
100
90 Burst Mode
OPERATION
80
70
60
PULSE-SKIPPING MODE
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
3577 G21
Step-Down Switching Regulator
Short-Circuit Current vs Temperature
1500
1400
1300
1200
800mA BUCK
1100
1000
900
500mA BUCK
800
700
600
500
–50 –25
V_INx = 3.8V
V_INx = 5V
0 25 50 75 100 125
TEMPERATURE (°C)
3577 G24
3577f