Datasheet

LTC3838-1
48
38381f
For more information www.linear.com/3838-1
Figure 20. 4.5V to 14V Input, 1.2V/50A 2-Phase Single Output, 300kHz, DCR Sense, DTR Enabled, Step-Down Converter
TYPICAL APPLICATIONS
38381 F20a
0.1µF
0.1µF
L2
0.4µH
L1
0.4µH
C
OUT4
100µF
×2
C
OUT3
330µF
×2
DB2
MT2
MB2
4.02k
+
LTC3838-1
2.2Ω
16.2k
2.2Ω
137k
V
IN
1µF
0.1µF
4.7µF
0.1µF
C
OUT2
330µF
×2
C
OUT1
100µF
×2
V
OUT
1.2V
50A
V
IN
4.5V TO 14V
SENSE1
–
SENSE1
+
BOOST1
TG1
SW1
SENSE2
+
BOOST2
TG2
SW2
DRV
CC1
INTV
CC
DRV
CC2
EXTV
CC
DB1
SENSE2
–
BG1 BG2
V
DFB2
+
V
DFB2
–
PGND
V
OUTSENSE1
+
V
OUTSENSE1
–
PGOOD1
PGOOD
PGOOD2
TRACK/SS1
ITH1
DTR1
V
RNG
TRACK/SS2
ITH2
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
SGND
RUN1
RT
MB1
MT1
1µF
C
IN2
22µF
×4
+
C
IN1
180µF
+
4.02k
16.2k
C
IN1
: SANYO 16SVP180MX
C
IN2
: MURATA GRM32ER61C226KE20L
C
OUT1
, C
OUT4
: MURATA GRM31CR60J107ME39L
C
OUT2
, C
OUT3
: SANYO 2R5TPE330M9
DB1, DB2: CENTRAL SEMI CMDSH-4ETR
L1, L2: VISHAY IHLP5050FDERR40M01
MT1, MT2: INFINEON BSC050NE2LS
MB1, MB2: INFINEON BSC010NE2LS
10k
20k
100k
47.5k
41.2k
0.01µF
47pF
470pF
20k
SGND
LOAD CURRENT (A)
0.1
50
EFFICIENCY (%)
POWER LOSS (W)
80
90
100
1 10
38381 F20b
70
60
0
6
8
10
4
2
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
V
IN
= 12V
V
OUT
= 1.2V
EFFICIENCY
POWER
LOSS
LOAD CURRENT (A)
0.1
50
EFFICIENCY (%)
POWER LOSS (W)
80
90
100
1 10
38381 F20c
70
60
0
6
8
10
4
2
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
V
IN
= 5V
V
OUT
= 1.2V
EFFICIENCY
POWER
LOSS