LTC3546 Datasheet, PDF (7/28 Pages) Linear Technology – Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3546
OUT2 Efficiency vs V_IN
100
98
96
94
600mA
92
90
88
86
3A
84
82 ^{SW1D CONNECTED TO SW2}
V_OUT = 2.5V
80
2.25 2.75 3.25 3.75 4.25 4.75 5.25
V_IN (V)
3546 G20
OUT2 Efficiency vs V_IN
100
98
96
94
92
400mA
90
88
2A
86
84
82 ^{SW1D CONNECTED TO SW1}
V_OUT = 2.5V
80
2.25 2.75 3.25 3.75 4.25 4.75 5.25
V_IN (V)
3546 G21
OUT1 Load Step
V_OUT
100mV/DIV
I_LOAD
1A/DIV
100μs/DIV
SW1D CONNECTED TO SW1
V_IN = 3.6V
V_OUT = 1.2V
I_LOAD = 200mA TO 1.9A
OUT1 Load Step
V_OUT
100mV/DIV
I_LOAD
250mA/DIV
100μs/DIV
SW1D CONNECTED TO SW2
V_IN = 3.6V
V_OUT = 1.2V
I_LOAD = 100mA TO 0.9A
OUT2 Load Step
V_OUT
100mV/DIV
I_LOAD
1A/DIV
3546 G23
100μs/DIV
SW1D CONNECTED TO SW2
V_IN = 3.6V
V_OUT = 1.8V
I_LOAD = 300mA TO 2.9A
OUT2 Load Step
V_OUT
100mV/DIV
I_LOAD
1A/DIV
3546 G24
100μs/DIV
SW1D CONNECTED TO SW1
V_IN = 3.6V
V_OUT = 1.8V
I_LOAD = 200mA TO 1.9A
3546 G22
3546 G25
OUT1 Efficiency vs Frequency
95
94
93
92
91
90
89
88
SW1D CONNECTED TO SW1
87 _{VIN = 3.6V}
86 ^VOUT ^{= 1.8V}
I_LOAD = 400mA
85
0.5 1.0 1.5 2.0 2.5 3.0
FREQUENCY (MHz)
3.5 4.0
3546 G26
OUT1 Efficiency vs Frequency
95
94
93
92
91
90
89
88
SW1D CONNECTED TO SW2
87 _{VIN = 3.6V}
86 ^VOUT ^{= 1.8V}
I_LOAD = 200mA
85
0.5 1.0 1.5 2.0 2.5 3.0
FREQUENCY (MHz)
3.5 4.0
3546 G27
OUT2 Efficiency vs Frequency
95
94
93
92
91
90
89
88
SW1D CONNECTED TO SW2
87 _{VIN = 3.6V}
86 ^VOUT ^{= 2.5V}
I_LOAD = 600mA
85
0.5 1.0 1.5 2.0 2.5 3.0
FREQUENCY (MHz)
3.5 4.0
3546 G28
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