Datasheet

LTC3838-1
46
38381f
For more information www.linear.com/3838-1
TYPICAL APPLICATIONS
Figure 18. 4.5V to 14V Input, 1.2V/20A and 1.5V/20A Dual Output, 300kHz, R
SENSE
, Step-Down Converter
100k
23.2k23.2k
470pF470pF
47pF47pF
38381 F18
1nF
0.1µF
L2
0.47µH
C
OUT4
100µF
×2
C
OUT3
330µF
×2
DB2
M2
+
LTC3838-1
2.2Ω
2.2Ω
10k
100k
137k
V
IN
1µF
1nF
4.7µF
0.1µF
0.01µF 0.01µF
L1
0.47µH
R
S1
0.0015Ω
R
S2
0.0015Ω
C
OUT2
330µF
×2
C
OUT1
100µF
×2
V
OUT1
1.2V
20A
V
OUT2
1.5V
20A
V
IN
4.5V TO 14V
15k
10k
10k
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 PGOOD2
TRACK/SS1
ITH1
DTR1
V
RNG
TRACK/SS2
ITH2
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
SGND
RUN1
RT
PGOOD1 PGOOD2
M1
1µF
C
IN2
22µF
×4
+
C
IN1
180µF
+
100Ω
100Ω
100Ω
100Ω
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: WÜRTH 7443330047
M1, M2: INFINEON BSC0911ND
10k//15k
SGND
LOAD CURRENT (A)
0.1
60
EFFICIENCY (%)
POWER LOSS (W)
90
100
1 10 100
38381 F18b
80
70
0
2
3
4
1
V
IN
= 12V
V
OUT
= 12V
V
IN
= 12V FCM
V
IN
= 12V DCM
LOSS
LOAD CURRENT (A)
0.1
60
EFFICIENCY (%)
POWER LOSS (W)
90
100
1 10 100
38381 F18c
80
70
0
6
8
10
4
2
V
IN
= 5V
V
OUT
= 12V
V
IN
= 5V FCM
V
IN
= 5V DCM
LOSS