Datasheet

LTC3838-1
50
38381f
For more information www.linear.com/3838-1
TYPICAL APPLICATIONS
100k
38381 F22a
1nF
0.1µF
L2
0.3µH
C
OUT2
100µF
×3
DB2
MT2
MB2
LTC3838-1
2.2Ω
2.2Ω
18.7k
100pF
51.1k
V
IN
1µF
1nF
4.7µF
0.1µF
0.01µF
L1
0.3µH
R
S1
0.004Ω
R
S2
0.004Ω
C
OUT1
100µF
×3
V
OUT
3.3V
25A
V
IN
4.5V TO 14V
45.3k
10k//45.3k
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
PGOOD
MB1
MT1
1µF
C
IN2
22µF
×4
C
IN1
180µF
+
10Ω
10Ω
10Ω
10Ω
C
IN1
: SANYO 165VP180MX
C
IN2
: MURATA GRM32ER61C226KE20L
C
OUT1
, C
OUT2
: MURATA GRM31CR60J107ME39L
DB1, DB2: CENTRAL CMDSH-3
L1, L2: WÜRTH 7443340030
MT1, MT2: INFINEON BSC050NE2LS
MB1, MB2: INFINEON BSC032NE2LS
SGND
LOAD CURRENT (A)
0.01
50
EFFICIENCY (%)
POWER LOSS (W)
80
90
100
0.1 1
38381 F22b
70
60
0
1.5
2.0
2.5
1.0
0.5
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
V
IN
= 12V
V
OUT
= 5V
EXTV
CC
TIED TO V
OUT
EFFICIENCY
POWER
LOSS
LOAD CURRENT (A)
0.01
50
EFFICIENCY (%)
POWER LOSS (W)
80
90
100
0.1 1
38381 F22c
70
60
0
1.5
2.0
2.5
1.0
0.5
FORCED CONTINUOUS MODE
DISCONTINUOUS MODE
V
IN
= 12V
V
OUT
= 3.3V
EXTV
CC
TIED TO 5V BIAS SUPPLY
EFFICIENCY MEASUREMENTS INCLUDE POWER
FROM THE 5V BIAS SUPPLY
EFFICIENCY
POWER
LOSS
Figure 22. 4.5V to 14V Input, 3.3V/25A Output, 2MHz, R
SENSE
, Step-Down Converter