LTC3855 LINER [Linear Technology], LTC3855 Datasheet - Page 48

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

LTC3838
TYPICAL APPLICATIONS
4.5V TO 14V
48
V
1.2V
OUT
50A
V
Figure 18. 4.5V to 14V Input, 1.2V/50A 2-Phase Single Output, 300kHz, DCR Sense, DTR Enabled, Step-Down Converter
IN
C
C
C
C
DB1, DB2: CENTRAL SEMI CMDSH-4ETR
L1, L2: VISHAY IHLP4040DZERR36M01
MT1, MT2: INFINEON BSC050NE2LS
MB1, MB2: INFINEON BSC010NE2LS
IN1
IN2
OUT1
OUT2
100
: SANYO 16SVP180MX
: TDK C3225X5R1C226MT
90
80
70
60
50
+
C
100μF
, C
, C
OUT1
2
0.1
OUT4
OUT3
V
V
IN
OUT
C
180μF
+
IN1
: MURATA GRM31CR60J107ME39L
: SANYO 2R5TPE330M9
= 12V
= 1.2V
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
C
330μF
OUT2
2
0.36μH
EFFICIENCY
L1
LOAD CURRENT (A)
2.55k
C
22μF
1
IN2
4
MT1
MB1
10
35.7k
100k
POWER
LOSS
3838 F18b
2.2Ω
2.2Ω
0.1μF
41.2k
1μF
10k
47pF
10
8
6
4
2
0
DB1
1μF
0.1μF
470pF
PGOOD
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
SENSE2
PHASMD
PGOOD2
CLKOUT
BOOST2
DRV
EXTV
V
RUN2
DTR2
RNG2
ITH2
SW2
V
TG2
BG2
CC2
FB2
CC
–
+
100
90
80
70
60
50
0.1
V
V
IN
OUT
= 5V
0.1μF
= 1.2V
0.1μF
DB2
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
EFFICIENCY
LOAD CURRENT (A)
1
MT2
MB2
3838 F18
10
2.55k
POWER
0.36μH
LOSS
L2
C
330μF
3838 F18c
OUT3
2
+
10
8
6
4
2
0
C
100μF
OUT4
2
3838fa