Datasheet

LTC3838-1
45
38381f
For more information www.linear.com3838-1
TYPICAL APPLICATIONS
Figure 17. 4.5V to 26V Input, 1.2V/15A and 1.5V/15A Dual Output, 350kHz, R
SENSE
, Step-Down Converter
100k
38381 F17a
1nF
0.1µF
L2
0.47µH
C
OUT4
100µF
×2
C
OUT3
330µF
×2
DB2
MT2
MB2
+
LTC3838-1
2.2Ω
2.2Ω
10k
22pF 22pF
220pF 220pF
39.2k 30.1k
100k
115k
V
IN
1µF
1nF
4.7µF
0.1µF
0.01µF 0.01µF
L1
0.47µH
R
S1
0.002Ω
R
S2
0.002Ω
C
OUT2
330µF
×2
C
OUT1
100µF
×2
V
OUT1
1.2V
12A
V
OUT2
1.5V
12A
V
IN
6V TO 26V
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
MB1
MT1
1µF
C
IN2
10µF
×3
+
C
IN1
220µF
+
100Ω
100Ω
100Ω
100Ω
C
IN1
: PANASONIC EEEFK1V221P
C
IN2
: TAIYO YUDEN GMK325BJ106MN-T
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
10k//15k
SGND
FREQUENCY (kHz)
10
–30
GAIN (dB)
PHASE (deg)
10
20
30
40
50
60
100 1000
38381 F17b
0
–10
–20
–45
60
75
90
15
0
30
45
–15
–30
GAIN
PHASE
FREQUENCY (kHz)
10
–30
GAIN (dB)
PHASE (deg)
10
20
30
40
50
60
100 1000
38381 F17c
0
–10
–20
–45
60
75
90
15
0
30
45
–15
–30
PHASE
GAIN
Bode plots taken with OMICRON Lab Bode 100 Vector Network Analyzer.
Channel 1 Loop Gain Channel 2 Loop Gain