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| LTC3839 Datasheet, PDF (47/50 Pages) Linear Technology – Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller | |||
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TYPICAL APPLICATIONS
VIN
4.5V TO 14V +
VOUT
3.3V
25A
CIN1
180μF
RS1
0.004Ω
COUT1
100μF
w6
CIN2
22μF
w4
L1
0.3μH
2.2Ω
1μF
10Ω
10Ω
1nF
0.1μF
LTC3839
VIN
SENSE1â
SENSE2â
SENSE1+
SENSE2+
BOOST1
BOOST2
MT1
TG1
TG2
DB1
2.2Ω
SW1
DRVCC1
SW2
DRVCC2
INTVCC
EXTVCC
1μF
4.7μF
MB1
BG1
BG2
100k
45.3k
PGND
VOUTSENSE+
10k
VOUTSENSEâ
PGOOD PGOOD
0.01μF
TRACK/SS
PHASMD
150pF
33.2k
18.7k
ITH
DTR
VRNG
RT
SGND
MODE/PLLIN
CLKOUT
RUN
LTC3839
10Ω
1nF 10Ω
0.1μF
DB2
MT2 L2
0.3μH
RS2
0.004Ω
MB2
CIN1: SANYO 16SVP180MX
CIN2: MURATA GRM32ER61C226KE20L
COUT1, COUT2: MURATA GRM31CR60J107ME39L
DB1, DB2: CENTRAL CMDSH-3
L1, L2: WÃRTH 7443340030
MT1, MT2: INFINEON BSC050NE2LS
MB1, MB2: INFINEON BSC032NE2LS
3839 F20a
100 VIN = 12V
90
DISCONTINUOUS
MODE
80
FORCED
CONTINUOUS
70
MODE
LOSS
60 FORCED
CM
50
0.1
LOSS
DCM
1
10
LOAD CURRENT (A)
10
8
6
4
2
0
100
3839 F20b
100
DISCONTINUOUS
MODE
90
80
FORCED
CONTINUOUS
MODE
70
10
VIN = 5V
8
6
4
60
LOSS
FORCED CM
50
0.1
1
2
LOSS
DCM
0
10
100
LOAD CURRENT (A)
3839 F20c
Figure 20. 4.5V to 14V Input, 3.3V/25A Output, 2MHz, RSENSE, Step-Down Converter
3839fa
47
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