LTC3839 Datasheet, PDF (45/50 Pages) Linear Technology – Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller

TYPICAL APPLICATIONS
V_IN
4.5V TO 14V
+ _CIN1
180μF
C_IN2
22μF
w4
V_OUT
1.2V
50A
2.55k
L1
0.33μH
C_OUT1 +
100μF
w2
C_OUT2
330μF
w2
2.2Ω
1μF
0.1μF
0.1μF
LTC3839
V_IN
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
BOOST1
BOOST2
MT1
TG1
TG2
DB1
2.2Ω
1μF
SW1
DRV_CC1
INTV_CC
4.7μF
SW2
DRV_CC2
EXTV_CC
MB1
BG1
BG2
100k
PGND
10k
V_OUTSENSE+
10k
V_{OUTSENSE–}
PGOOD _PGOOD
0.01μF
PHASMD
TRACK/SS
47pF
ITH
470pF
47.5k
MODE/PLLIN
41.2k
137k
DTR
V_RNG
RT
SGND
CLKOUT
RUN
LTC3839
0.1μF
0.1μF
DB2
2.55k
MT2
L2
0.33μH
C_OUT3 +
330μF
C_OUT4
100μF
MB2
w2
w2
C_IN1: SANYO 16SVP180MX
C_IN2: MURATA GRM32ER61C226KE20L
C_OUT1, C_OUT4: MURATA GRM31CR60J107ME39L
C_OUT2, C_OUT3: SANYO 2R5TPE330M9
DB1, DB2: CENTRAL SEMI CMDSH-4ETR
L1, L2: VISHAY IHLP5050CEERR33M01
MT1, MT2: INFINEON BSC050NE2LS
MB1, MB2: INFINEON BSC010NE2LS
3839 F18a
100
10
V_IN = 12V
90
8
DISCONTINUOUS
MODE
80
6
70
FORCED
4
CONTINUOUS
MODE
60 ^LOSS
FORCED CM
50
0.1
1
2
LOSS
DCM
0
10
100
LOAD CURRENT (A)
3839 F18b
100
10
V_IN = 5V
90
DISCONTINUOUS
MODE
8
80
FORCED
6
CONTINUOUS
MODE
70
4
60
50
0.1
LOSS
FORCED
CM
1
10
LOAD CURRENT (A)
2
LOSS
DCM
0
100
3839 F18c
Figure 18. 4.5V to 14V Input, 1.2V/50A Output, 300kHz, DCR Sense, DTR Enabled, Step-Down Converter
3839fa
45