LTC3546 Datasheet, PDF (9/28 Pages) Linear Technology – Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator

APPLICATIONS INFORMATION
LTC3546
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
OUT2 Efficiency vs Frequency
95
94
93
92
91
90
89
88
87
SW1D CONNECTED TO SW1
V_IN = 3.6V
86 ^VOUT ^{= 2.5V}
I_LOAD = 400mA
85
0.5 1.0 1.5 2.0 2.5 3.0
FREQUENCY (MHz)
3.5 4.0
3546 G29
OUT1 R_DS(ON) vs V_IN
0.120
0.115
0.110
0.105
0.100
P-CHANNEL IMP
0.095
0.090
0.085 N-CHANNEL IMP
0.080
0.075 ^{SW1D CONNECTED TO SW1}
T_A = 27°C
0.070
2.0 2.5 3.0 3.5 4.0 4.5
V_IN (V)
5.0 5.5
3546 G30
OUT1 R_DS(ON) vs V_IN
0.24
0.23
0.22
0.21
P-CHANNEL IMP
0.20
0.19
0.18
0.17 ^{N-CHANNEL IMP}
0.16 SW1D CONNECTED TO SW2
T_A = 27°C
0.15
2.0 2.5 3.0 3.5 4.0 4.5
V_IN (V)
5.0 5.5
3546 G31
3546f
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