LTC3546_15 Datasheet, PDF (8/30 Pages) Linear Technology – Dual Synchronous, 3A/1A or 2A/2A Configurable Step-Down DC/DC Regulator

LTC3546
Typical Performance Characteristics
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
OUT2 R_DS(ON) vs V_IN
0.080
SW1D CONNECTED TO SW2
T_A = 27°C
0.075
0.070
0.065
0.060
P-CHANNEL IMP
0.055
N-CHANNEL IMP
0.050
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3546 G32
Frequency Variation vs
Temperature
2
FREQ 143k TO GND
1
FREQ TO V_IN
0
–1
–2
–3
–4
–5
–6
–50 –25
0 55 50 75
TEMPERATURE (°C)
100 125
3546 G35
8
OUT2 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 G33
OUT1 Minimum Peak Current
vs V_BMC1
4.0
V_IN = 3.6V
3.5
3.0
SW1D TO SW1
2.5
2.0
1.5
1.0
SW1D TO SW2
0.5
0
0.25 0.35 0.45 0.55 0.65 0.75 0.85 0.95
V_BMC1 (V)
3546 G36
For more information www.linear.com/3546
Frequency Variation vs V_IN
6
FREQ 143k TO GND
4
FREQ TO V_IN
2
0
–2
–4
–6
–8
–10
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3546 G34
OUT2 Minimum Peak Current
vs V_BMC2
6
V_IN = 3.6V
5
SW1D TO SW2
4
3
2
SW1D TO SW1
1
0
0.25 0.35 0.45 0.55 0.65 0.75 0.85 0.95
V_BMC1 (V)
3546 G37
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