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LTC3851_15 Datasheet, PDF (25/28 Pages) Linear Technology – Synchronous Step-Down Switching Regulator Controller
LTC3851
TYPICAL APPLICATIONS
RFREQ
82.5k
MODE/PLLIN VIN
FREQ/PLLFLTR TG
C20
0.1μF
CSS
0.1μF
RC
CC
2200pF
15k
CC2
330pF
RUN
BOOST
LTC3851
TK/SS
SW
ITH
INTVCC
VFB
BG
SENSE–
GND
C5
30.1k 0.047μF
SENSE+
ILIM
VIN
4.5V TO 32V
CB
0.1μF
M1
HAT2170H
+ CIN
22μF
L1
0.68μH
DB
CMDSH05-4
R27
3.01k
4.7μF
M2
HAT2170H
VOUT
3.3V
C15
47pF
R2
154k
1% +
15A
COUT
330μF
R1
s2
48.7k
1%
COUT: SANYO 6TPE330MIL
CIN: SANYO 63HVH22M
L1: VISHAY IHLP5050-EZERR68MO1
3851 F11
Figure 11. High Efficiency 3.3V/15A Step-Down Converter
PLLIN
C2
350kHz
0.01μF R5
10k
MODE/PLLIN VIN
FREQ/PLLFLTR TG
C1
1000pF
RC
CC
1000pF
7.5k
CSS
0.1μF
CC2
100pF
RUN
BOOST
LTC3851
TK/SS
SW
ITH
INTVCC
VFB
BG
SENSE–
GND
1000pF
SENSE+
ILIM
R22 10Ω
R20 10Ω
VIN
6V TO 14V
+
CB
0.1μF
M1
RJK0305DPB
CIN
180μF
DB
CMDSH-3
L1
0.68μH
RSENSE
0.002Ω
4.7μF
M2
RJK0301DPB
VOUT
1.5V
C10
33pF
R2
43.2k
1% +
15A
COUT
330μF
R1
s2
20k
1%
COUT: SANYO 2R5TPE330M9
L1: SUMIDA CEP125-OR6MC
3851 F12
Figure 12. 1.5V/15A Synchronized at 350kHz
3851fb
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