LTC3577 Datasheet, PDF (13/52 Pages) Linear Technology – Highly Integrated 6-Channel Portable PMIC

LTC3577/LTC3577-1
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified
Step-Down Switching Regulator
Output Transient (Burst Mode
Operation)
Step-Down Switching Regulator
Output Transient (Pulse-Skipping
Mode)
V_OUT1
50mV/DIV
(AC)
V_OUT2
50mV/DIV
(AC)
V_OUT3
100mV/DIV
(AC)
V_OUT1
50mV/DIV
(AC)
V_OUT2
50mV/DIV
(AC)
V_OUT3
100mV/DIV
(AC)
500mA
I_{OUT3 5mA}
V_OUT1 = 3.3V
50μs/DIV
I_OUT1 = 10mA
V_OUT2 = 1.8V
I_OUT2 = 20mA
V_OUT3 = 1.2V
V_OUT = V_BAT = 3.8V
3577 G25
500mA
I_{OUT3 5mA}
V_OUT1 = 3.3V
50μs/DIV
I_OUT1 = 30mA
V_OUT2 = 1.8V
I_OUT2 = 20mA
V_OUT3 = 1.2V
V_OUT = V_BAT = 3.8V
3577 G26
800mA Step-Down Switching
Regulator Feedback Voltage
vs Output Current
0.85
500mA Step-Down Switching
Regulator Feedback Voltage
vs Output Current
0.85
Step-Down Switching Regulator
Switch Impedance vs Temperature
0.9
V_INX = 3.2V
0.8
0.7
500mA
0.6 _NMOS
500mA
PMOS
0.5
0.4
800mA PMOS
0.3
800mA NMOS
0.2
0.1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3577 G27
LDO Load Step
0.84
0.83
0.82
Burst Mode
OPERATION
0.81
0.80
PULSE-SKIPPING MODE
0.79
0.84
0.83
0.82
Burst Mode
OPERATION
0.81
0.80
0.79
PULSE-SKIPPING MODE
LDO1
50mV/DIV
(AC)
LDO2
20mV/DIV
(AC)
0.78
0.77
0.76
0.75
0.1
1
10
100
OUTPUT CURRENT (mA)
3.8V
5V
1000
0.78
0.77
0.76
0.75
0.1
1
10
100
OUTPUT CURRENT (mA)
100mA
I_{OUT1 5mA}
3.8V
5V
1000
LDO1 = 1.2V
20μs/DIV
LDO2 = 2.5V
I_LDO2 = 40mA
V_OUT = V_BAT = 3.8V
3577 G30
3577 G28
3577 G29
OVP Connection Waveform
OVP Protection Waveform
OVP Reconnection Waveform
V_BUS
5V/DIV
OVGATE
5V/DIV
OVP
INPUT
VOLTAGE
0V TO 5V
STEP 5V/DIV
500μs/DIV
V_BUS
5V/DIV
OVGATE
5V/DIV
OVP
INPUT
VOLTAGE
5V TO 10V
STEP 5V/DIV
3577 G31
500μs/DIV
V_BUS
5V/DIV
OVGATE
5V/DIV
OVP
INPUT
VOLTAGE
10V TO 5V
3577 G32 _{STEP 5V/DIV}
500μs/DIV
3577 G33
3577f
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