Datasheet

LTC3851A
25
3851afa
Typical applicaTions
MODE/PLLIN
FREQ/PLLFLTR
RUN
TK/SS
I
TH
V
FB
SENSE
–
SENSE
+
V
IN
TG
BOOST
SW
INTV
CC
BG
GND
I
LIM
LTC3851A
C
SS
0.1µF
C5
0.047µF
C
B
0.1µF
C
C2
330pF
C
C
2200pF
R
FREQ
82.5k
R
C
15k
V
OUT
3.3V
15A
C15
47pF
4.7µF
+
C
OUT
330µF
×2
C
IN
22µF
M1
HAT2170H
M2
HAT2170H
C
OUT
: SANYO 6TPE330MIL
C
IN
: SANYO 63HVH22M
L1: VISHAY IHLP5050-EZERR68MO1
3851A F11
D
B
CMDSH05-4
R2
154k
1%
R1
48.7k
1%
V
IN
4.5V TO 32V
L1
0.68µH
R27
3.01k
C20
0.1µF
+
30.1k
Figure 11. High Efficiency 3.3V/15A Step-Down Converter
MODE/PLLIN
FREQ/PLLFLTR
RUN
TK/SS
I
TH
V
FB
SENSE
–
SENSE
+
V
IN
TG
BOOST
SW
INTV
CC
BG
GND
I
LIM
LTC3851A
C
SS
0.1µF
C
B
0.1µF
C
C2
100pF
C
C
1000pF
C2
0.01µF
PLLIN
350kHz
C1
1000pF
R5
1k
R22 10Ω
R20 10Ω
R
C
7.5k
R
SENSE
0.002Ω
V
OUT
1.5V
15A
1000pF
4.7µF
+
C
OUT
330µF
×2
C
IN
180µF
C10
33pF
M1
RJK0305DPB
M2
RJK0301DPB
C
OUT
: SANYO 2R5TPE330M9
L1: SUMIDA CEP125-OR6MC
3851A F12
D
B
CMDSH-3
R2
43.2k
1%
R1
20k
1%
V
IN
6V TO 14V
L1
0.68µH
+
Figure 12. 1.5V/15A Synchronized at 350kHz