LTC3855 LINER [Linear Technology], LTC3855 Datasheet - Page 49

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

TYPICAL APPLICATIONS
6.5V TO 34V
V
OUT1
12A
5V
Figure 19. 6.5V to 34V Input, 5V/12A and 3.3V/12A Dual Output, 300kHz, R
V
IN
C
100μF
OUT1
+
100
80
40
+
90
70
60
50
0.1
C
220μF
IN1
C
150μF
0.002Ω
OUT2
2
R
S1
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
EFFICIENCY
C
10μF
2.2μH
LOAD CURRENT (A)
IN2
3
L1
1
MB1
MT1
100k
20Ω
20Ω
POWER
LOSS
V
V
2.2Ω
2.2Ω
0.1μF
IN
OUT
53.6k
= 12V
73.2k
3838 F19b
1μF
= 5V
22pF
10
1μF
1nF
DB1
220pF
3.0
2.5
2.0
1.0
0
PGOOD1
1.5
0.5
0.01μF
10k
137k
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
SENSE
0.01μF
V
220pF
OUT1
100
, 5V Output Tied to EXTV
0.1μF
80
40
22pF
90
70
60
50
1nF
DB2
100k
0.1
45.3k
20Ω
20Ω
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
10k
3838 F19
45.3k
MT2
MB2
LOAD CURRENT (A)
EFFICIENCY
1
C
C
C
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
1.3μH
IN1
IN2
OUT1
L2
: PANASONIC EEEFK1V221P
: TAIYO YUDEN GMK325BJ106MN-T
, C
CC
OUT4
0.002Ω
C
330μF
POWER
, Step-Down Converter
R
OUT3
S2
V
V
LOSS
: MURATA GRM31CR60J107ME39L
IN
OUT
= 12V
+
= 3.3V
LTC3838
3838 F19c
10
C
100μF
OUT4
3.0
2.0
1.0
0
2.5
1.5
0.5
49
V
3.3V
12A
OUT2
3838fa