Datasheet

LTC3839
43
3839fa
TYPICAL APPLICATIONS
Figure 16. 4.5V to 38V Input, 1.2V/30A Output, 350kHz, DCR Sense, Step-Down Converter
3839 F16a
0.1µF
0.1µF
L2
0.56µH
C
OUT3
100µF
w2
C
OUT4
330µF
w2
15k
DB2
MT2
MB2
3.57k
+
LTC3839
2.2
2.2
10k
100k
40.2k
115k
V
IN
1µF
0.1µF
4.7µF
0.1µF
0.01µF
22pF
220pF
L1
0.56µH
C
OUT2
330µF
w2
C
OUT1
100µF
w2
V
OUT
1.2V
30A
V
IN
4.5V TO 38V
15k
10k
SENSE1
–
SENSE1
+
BOOST1
TG1
SW1
SENSE2
+
BOOST2
TG2
SW2
DRV
CC1
INTV
CC
DRV
CC2
EXTV
CC
DB1
MT1
3.57k
SENSE2
–
BG1 BG2
PGND
V
OUTSENSE
+
V
OUTSENSE
–
PGOOD
TRACK/SS
ITH
DTR
V
RNG
PHASMD
MODE/PLLIN
CLKOUT
RUN
SGND
RT
PGOOD
MB1
1µF
C
IN2
10µF
w3
+
C
IN1
100µF
+
C
IN1
: NICHICON UCJ1H101MCL165
C
IN2
: MURATA GRM32ER71H106K
C
OUT2
, C
OUT4
: SANYO 2R5TPE330M9
C
OUT1
, C
OUT3
: MURATA GRM31CR60J107ME39L
DB1, DB2: DIODES INC. SDM10K45
L1, L2: TOKO FDA1055-R56M
MT1, MT2: INFINEON BSC093N04LSG
MB1, MB2: INFINEON BSC035N04LSG
LOAD CURRENT (A)
0.1
EFFICIENCY (%)
POWER LOSS (W)
80
90
100
110100
3839 F16b
70
60
50
0
3
4
5
2
1
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
110100
3839 F16c
70
60
50
0
3
4
5
2
1
V
IN
= 5V
FORCED
CONTINUOUS
MODE
DISCONTINUOUS
MODE
LOSS
DCM
LOSS
FORCED
CM