Datasheet

LTC3839
44
3839fa
TYPICAL APPLICATIONS
Figure 17. 6V to 26V Input, 1.2V/30A Output, 350kHz, R
SENSE
, Step-Down Converter
LOAD CURRENT (A)
0.1
EFFICIENCY (%)
POWER LOSS (W)
80
90
100
1 10 100
3839 F17b
70
60
50
0
3
4
5
2
1
V
IN
= 12V
FORCED
CONTINUOUS MODE
DISCONTINUOUS
MODE
LOSS
DCM
LOSS
FORCED
CM
LOAD CURRENT (A)
0.1
EFFICIENCY (%)
POWER LOSS (W)
80
90
100
1 10 100
3839 F17c
70
60
50
0
3
4
5
2
1
V
IN
= 5V
FORCED
CONTINUOUS
MODE
DISCONTINUOUS
MODE
LOSS
DCM
LOSS
FORCED
CM
3839 F17a
1nF
0.1µF
L2
0.47µH
C
OUT4
100µF
w2
C
OUT3
330µF
w2
DB2
MT2
MB2
+
LTC3839
2.2
2.2
10k
39pF
220pF
39.2k
100k
115k
10k
60.4k
V
IN
1µF
1nF
4.7µF
0.1µF
0.01µF
L1
0.47µH
R
S1
0.002
R
S2
0.002
C
OUT2
330µF
w2
C
OUT1
100µF
w2
V
OUT
1.2V
30A
V
IN
6V TO 26V
10k
SENSE1
–
SENSE1
+
BOOST1
TG1
SW1
SENSE2
+
BOOST2
TG2
SW2
DRV
CC1
INTV
CC
DRV
CC2
EXTV
CC
DB1
SENSE2
–
BG1 BG2
PGND
V
OUTSENSE
+
V
OUTSENSE
–
PGOOD
TRACK/SS
ITH
DTR
V
RNG
SGND
RT
PGOOD
MB1
MT1
1µF
C
IN2
10µF
w3
+
C
IN1
220µF
+
20
20
20
20
C
IN1
: PANASONIC EEEFK1V221P
C
IN2
: MURATA GRM32ER71H106K
C
OUT1
, C
OUT4
: MURATA GRM31CR60J107ME39L
C
OUT2
, C
OUT3
: SANYO 2R5TPE330M9
DB1, DB2: CENTRAL SEMI CMDSH-4ETR
L1, L2: WÜRTH 7443330047
MT1, MT2: RENESAS RJK0305DPB
MB1, MB2: RENESAS RJK0330DPB
PHASMD
MODE/PLLIN
CLKOUT
RUN