LTC3855 LINER [Linear Technology], LTC3855 Datasheet - Page 46

• Manufacturer Part Number: LTC3855
• Description: Dual, Fast, Accurate Step-Down DC/DC Controller
• Manufacturer: LINER [Linear Technology]

LTC3838
TYPICAL APPLICATIONS
V
46
OUT1
1.2V
15A
4.5V TO 38V
V
C
100μF
IN
OUT1
2
Figure 16. 4.5V to 38V Input, 1.2V/15A and 1.5V/15A Dual Output, 350kHz, DCR Sense, Step-Down Converter
+
+
100
90
80
70
60
50
40
C
330μF
C
100μF
OUT2
2
0.1
IN1
EFFICIENCY
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
0.56μH
C
10μF
L1
IN2
3
LOAD CURRENT (A)
3.57k
1
MT1
MB1
POWER
LOSS
V
V
IN
OUT
= 12V
= 1.2V
2.2Ω
2.2Ω
3838 F16b
15k
0.1μF
10
40.2k
100k
1μF
10k
22pF
2.5
2.0
1.5
1.0
0.5
0
DB1
1μF
0.1μF
115k
220pF
PGOOD1
0.01μF
10k
4.7μF
V
SENSE1
SENSE1
BOOST1
TG1
SW1
DRV
INTV
BG1
PGND
V
V
PGOOD1
TRACK/SS1
ITH1
DTR1
V
RT
SGND
RUN1
IN
OUTSENSE1
OUTSENSE1
RNG1
CC1
CC
–
+
LTC3838
MODE/PLLIN
+
–
TRACK/SS2
SENSE2
PHASMD
SENSE2
PGOOD2
BOOST2
CLKOUT
DRV
EXTV
V
RUN2
DTR2
RNG2
SW2
ITH2
V
TG2
BG2
CC2
FB2
CC
–
+
PGOOD2
0.01μF
220pF
100
90
80
70
60
50
40
0.1μF
22pF
100k
40.2k
0.1
0.1μF
DB2
EFFICIENCY
15k
10k
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
15k
LOAD CURRENT (A)
MT2
MB2
3838 F16a
1
C
C
C
C
DB1, DB2: DIODES INC. SDM10K45
L1, L2: TOKO FDA1055-R56M
MT1, MT2: INFINEON BSC093N04LSG
MB1, MB2: INFINEON BSC035N04LSG
IN1
IN2
OUT2
OUT1
3.57k
: NICHICON UCJ1H101MCL165
: MURATA GRM32ER71H106K
0.56μH
, C
, C
L2
POWER
V
V
OUT4
OUT3
IN
OUT
LOSS
= 12V
= 1.5V
: SANYO 2R5TPE330M9
: MURATA GRM31CR60J107ME39L
3838 F16c
10
C
330μF
OUT4
3.0
2.5
2.0
1.5
1.0
0.5
0
2
+
C
100μF
OUT3
2
3838fa
V
1.5V
15A
OUT2