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| LTC3851-1_15 Datasheet, PDF (25/28 Pages) Linear Technology – Synchronous Step-Down Switching Regulator Controller | |||
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LTC3851-1
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
LTC3851-1
TK/SS
SW
ITH
INTVCC
VFB
BG
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
30.1k
C5
0.047μF
SENSEâ
SENSE+
GND
PGOOD
RPG
VPULL-UP
VOUT
3.3V
C15 R2
15A
47pF
154k
1% +
COUT
330μF
R1
s2
48.7k
1%
COUT: SANYO 6TPE330MIL
CIN: SANYO 63HVH22M
L1: VISHAY IHLP5050-EZERR68M01
38511 F11
Figure 11. High Efï¬ciency 3.3V/15A Step-Down Converter
RFREQ
160k
0.1μF
RC
CC
470pF
33k
MODE/PLLIN VIN
FREQ/PLLFLTR TG
CSS
0.1μF
CC2
220pF
RUN
BOOST
LTC3851-1
TK/SS
SW
ITH
INTVCC
VFB
BG
VIN
4.5V TO 22V
CB
0.1μF
+ CIN
22μF
M1
25V
FDS6982S
DB
CMDSH-3
L1
3.3μH
RSENSE
0.01Ω
4.7μF
M2
FDS6982S
R2
32.4k
1% +
R1
25.5k
1%
VOUT
1.8V
5A
COUT
150μF
6.3V
s2
PANASONIC SP
1000pF
SENSEâ
SENSE+
GND
RPG
PGOOD
VPULL-UP
COUT: PANASONIC EEFUEOG151R
CIN: MARCON THCR70LE1H226ZT
L1: PANASONIC ETQP6F3R3HFA
RSENSE: IRC LR 2010-01-R010F
38511 TA02
Figure 12. 1.8V/5A Converter from Design Example with Pulse Skip Operation
38511fa
25
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