Datasheet

LTC3839
47
3839fa
TYPICAL APPLICATIONS
Figure 20. 4.5V to 14V Input, 3.3V/25A Output, 2MHz, R
SENSE
, Step-Down Converter
3839 F20a
1nF
0.1µF
L2
0.3µH
DB2
MT2
MB2
LTC3839
2.2
2.2
45.3k
100k
33.2k
18.7k
V
IN
1µF
1nF
4.7µF
0.1µF
0.01µF
150pF
L1
0.3µH
R
S1
0.004
R
S2
0.004
C
OUT1
100µF
w6
V
OUT
3.3V
25A
V
IN
4.5V TO 14V
10k
SENSE1
–
SENSE1
+
BOOST1
TG1
SW1
SENSE2
+
BOOST2
TG2
SW2
DRV
CC1
INTV
CC
DRV
CC2
EXTV
CC
DB1
SENSE2
–
BG1 BG2
PGND
V
OUTSENSE
+
V
OUTSENSE
–
PGOOD
TRACK/SS
ITH
DTR
V
RNG
SGND
RT
PGOOD
MB1
MT1
1µF
C
IN2
22µF
w4
C
IN1
180µF
+
10
10
10
10
C
IN1
: SANYO 16SVP180MX
C
IN2
: MURATA GRM32ER61C226KE20L
C
OUT1
, C
OUT2
: MURATA GRM31CR60J107ME39L
DB1, DB2: CENTRAL CMDSH-3
L1, L2: WÜRTH 7443340030
MT1, MT2: INFINEON BSC050NE2LS
MB1, MB2: INFINEON BSC032NE2LS
PHASMD
MODE/PLLIN
CLKOUT
RUN
LOAD CURRENT (A)
0.1
EFFICIENCY (%)
POWER LOSS (W)
80
90
100
1 10 100
3839 F20b
70
60
50
6
10
8
4
2
0
V
IN
= 12V
FORCED
CONTINUOUS
MODE
DISCONTINUOUS
MODE
LOSS
DCM
LOSS
FORCED
CM
LOAD CURRENT (A)
0.1
EFFICIENCY (%)
POWER LOSS (W)
80
90
100
1 10 100
3839 F20c
70
60
50
6
10
8
4
2
0
V
IN
= 5V
FORCED
CONTINUOUS
MODE
LOSS
DCM
LOSS
FORCED CM
DISCONTINUOUS
MODE