Datasheet

LTC3838-1
44
38381f
For more information www.linear.com/3838-1
TYPICAL APPLICATIONS
Figure 16. 4.5V to 38V Input, 1.2V/15A and 1.5V/15A Dual Output, 350kHz, DCR Sense, Step-Down Converter
100k
20k
38381 F16a
0.1µF
0.1µF
0.01µF
22pF
220pF
L2
0.56µH
C
OUT3
100µF
×2
C
OUT4
330µF
×2
V
OUT2
1.5V
15A
15k
DB2
MT2
MB2
3.57k
+
LTC3838-1
2.2Ω
2.2Ω
10k 15k
100k
20k
115k
V
IN
1µF
0.1µF
4.7µF
0.1µF
0.01µF
22pF
220pF
L1
0.56µH
C
OUT2
330µF
×2
C
OUT1
100µF
×2
V
OUT1
1.2V
15A
V
IN
4.5V TO 38V
15k
10k
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
V
DFB2
+
V
DFB2
–
PGND
V
OUTSENSE1
+
V
OUTSENSE1
–
PGOOD1 PGOOD2
TRACK/SS1
ITH1
DTR1
V
RNG
TRACK/SS2
ITH2
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
SGND
RUN1
RT
PGOOD1 PGOOD2
MB1
1µF
C
IN2
10µF
×3
+
C
IN1
100µF
+
C
IN1
: NICHICON UCJ1H101MCL1GS
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
10k//15k
SGND
LOAD CURRENT (A)
0.1
40
EFFICIENCY (%)
POWER LOSS (W)
80
90
100
1
EFFICIENCY
10
38381 F16b
70
60
50
0
1.5
2.0
2.5
1.0
0.5
V
IN
= 12V
V
OUT
= 1.2V
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
POWER
LOSS
LOAD CURRENT (A)
0.1
40
EFFICIENCY (%)
POWER LOSS (W)
50
60
70
80
100
1 10
38381 F16c
90
0
0.5
1.0
1.5
2.0
3.0
2.5
EFFICIENCY
V
IN
= 12V
V
OUT
= 1.5V
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
POWER
LOSS