Datasheet

LTC3838
49
3838fa
TYPICAL APPLICATIONS
Figure 19. 6.5V to 34V Input, 5V/12A and 3.3V/12A Dual Output, 300kHz, R
SENSE
, 5V Output Tied to EXTV
CC
, Step-Down Converter
100k
3838 F19
1nF
0.1µF
L2
1.3µH
C
OUT4
100µF
C
OUT3
330µF
DB2
V
OUT1
MT2
MB2
+
LTC3838
2.2
2.2
73.2k
100k
137k
220pF 220pF
22pF 22pF
53.6k 45.3k
V
IN
1µF
1nF
4.7µF
0.1µF
0.01µF 0.01µF
L1
2.2µH
R
S1
0.002
R
S2
0.002
C
OUT2
150µF
w2
C
OUT1
100µF
V
OUT1
5V
12A
V
OUT2
3.3V
12A
V
IN
6.5V TO 34V
45.3k
10k
10k
SENSE1
–
SENSE1
+
BOOST1
TG1
SW1
SENSE2
+
BOOST2
TG2
SW2
DRV
CC1
INTV
CC
DRV
CC2
EXTV
CC
DB1
SENSE2
–
BG1 BG2
V
FB2
PGND
V
OUTSENSE1
+
V
OUTSENSE1
–
PGOOD1 PGOOD2
TRACK/SS1
ITH1
DTR1
V
RNG1
TRACK/SS2
ITH2
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
V
RNG2
SGND
RUN1
RT
PGOOD1 PGOOD2
MB1
MT1
1µF
C
IN2
10µF
w3
+
C
IN1
220µF
+
20
20
20
20
C
IN1
: PANASONIC EEEFK1V221P
C
IN2
: TAIYO YUDEN GMK325BJ106MN-T
C
OUT1
, C
OUT4
: MURATA GRM31CR60J107ME39L
COUT2: SANYO 6TPE150MIC2
COUT3: SANYO 4TPD330M
DB1, DB2: DIODES INC. SDM10K45
L1: WÜRTH 7443320220
L2: WÜRTH 7443551130
MT1, MT2: INFINEON BSC093N04LSG
MB1, MB2: INFINEON BSC035N04LSG
LOAD CURRENT (A)
0.1
40
EFFICIENCY (%)
POWER LOSS (W)
50
60
70
80
100
110
3838 F19b
90
0
0.5
1.0
1.5
2.0
3.0
2.5
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
EFFICIENCY
POWER
LOSS
V
IN
= 12V
V
OUT
= 5V
LOAD CURRENT (A)
0.1
40
EFFICIENCY (%)
POWER LOSS (W)
50
60
70
80
100
110
3838 F19c
90
0
0.5
1.0
1.5
2.0
3.0
2.5
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
EFFICIENCY
POWER
LOSS
V
IN
= 12V
V
OUT
= 3.3V