LTC3839 Datasheet, PDF (43/50 Pages) Linear Technology – Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller

TYPICAL APPLICATIONS
V_IN
4.5V TO 38V
+ _CIN1
100μF
C_IN2
10μF
w3
V_OUT
1.2V
30A
3.57k
L1
MT1
0.56μH
+ C_OUT1
C_OUT2
100μF
330μF
w2
w2
MB1
2.2Ω
1μF
15k
0.1μF
0.1μF
LTC3839
V_IN
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
BOOST1
BOOST2
2.2Ω
1μF
DB1
4.7μF
TG1
SW1
DRV_CC1
INTV_CC
BG1
TG2
SW2
DRV_CC2
EXTV_CC
BG2
10k
100k
PGND
V_OUTSENSE+
10k
V_{OUTSENSE–}
PGOOD _PGOOD
0.01μF
PHASMD
TRACK/SS
22pF
ITH
220pF
40.2k
MODE/PLLIN
115k
DTR
V_RNG
RT
SGND
CLKOUT
RUN
LTC3839
0.1μF 15k
0.1μF
DB2
3.57k
MT2
L2
0.56μH
C_OUT4 +
330μF
C_OUT3
100μF
w2
w2
MB2
C_IN1: NICHICON UCJ1H101MCL165
C_IN2: MURATA GRM32ER71H106K
C_OUT2, C_OUT4: SANYO 2R5TPE330M9
C_OUT1, C_OUT3: MURATA GRM31CR60J107ME39L
DB1, DB2: DIODES INC. SDM10K45
L1, L2: TOKO FDA1055-R56M
MT1, MT2: INFINEON BSC093N04LSG
MB1, MB2: INFINEON BSC035N04LSG
3839 F16a
100
5
V_IN = 12V FORCED
CONTINUOUS MODE
90 _{DISCONTINUOUS}
4
MODE
80
3
70
2
60
LOSS
FORCED CM
1
LOSS
50
DCM
0
0.1
1
10
100
LOAD CURRENT (A)
3839 F16b
100
5
V_IN = 5V
DISCONTINUOUS
90 MODE
4
80
FORCED
CONTINUOUS
3
MODE
70
2
60
50
0.1
LOSS
FORCED
1
CM
LOSS
DCM
0
1
10
100
LOAD CURRENT (A)
3839 F16c
Figure 16. 4.5V to 38V Input, 1.2V/30A Output, 350kHz, DCR Sense, Step-Down Converter
3839fa
43