Datasheet

LTC3546
26
3546fc
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applicaTions inForMaTion
Figure 9. Typical Schematic for 3A/1A Regulator
3546 F09
LTC3546
PGOOD1
SW1
RUN1
V
FB1
BMC1
TRACK/SS1
FREQ
I
TH1
PGOOD2
SW2A
RUN2
V
FB2
BMC2
TRACK/SS2
PHASE
I
TH2
R6
100k
R5
100k
C
OUT1
22µF
R
FREQ
143k
V
IN1
V
IN
V
OUT1
1.8V, 1A
V
IN
V
IN
V
IN
V
CCA
V
CCD
V
IN2
PGND2
EXPOSED PAD
GNDA PGND1
R2
30.1k
R1
59k
R4
30.1k
R3
95.3k
C
FF1
100pF
L1
1.2µH
C
OUT2
33µF
x2
V
OUT2
2.5V, 3A
V
IN
2.25V TO 5.5V
C
FF2
100pF
L2
0.56µH
SYNC/MODE
SW2B
SW1D
C
IN
22µF
C
ITH1
1000pF
C
ITH2
1000pF
R
ITH2
13k
R
ITH1
13k
LOAD CURRENT (A)
EFFICIENCY (%)
3546 F09b
0.001 0.01 10.1
POWER LOSS
EFFICIENCY
100
95
80
90
85
75
70
POWER LOSS (W)
100
1
0.01
10
0.1
0.0001
0.001
OUT1 Efficiency (Burst Mode Operation)
LOAD CURRENT (A)
0.001 0.01
EFFICIENCY (%)
POWER LOSS (W)
100
80
75
95
90
85
70
100
10
1
0.1
0.01
0.0001
0.001
1
3546 F09c
100.1
SW1D CONNECTED TO SW2
V
IN
= 3.6V
V
OUT
= 2.5V
EFFICIENCY
POWER LOSS
OUT2 Efficiency (Burst Mode Operation)