LTC3839 Datasheet, PDF (44/50 Pages) Linear Technology – Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller

LTC3839
TYPICAL APPLICATIONS
V_OUT
1.2V
30A
V_IN
6V TO 26V
+ _CIN1
220μF
C_IN2
10μF
w3
MT1
R_S1
0.002Ω
L1
0.47μH
+ C_OUT1
C_OUT2
100μF
330μF
w2
w2
MB1
2.2Ω
1μF
20Ω
20Ω
1nF
0.1μF
LTC3839
V_IN
SENSE1^–
SENSE2^–
SENSE1⁺
SENSE2⁺
BOOST1
TG1
DB1
2.2Ω
1μF
SW1
4.7μF
DRV_CC1
INTV_CC
BG1
BOOST2
TG2
SW2
DRV_CC2
EXTV_CC
BG2
100k
PGND
10k
V_OUTSENSE+
10k
PGOOD
0.01μF
V_{OUTSENSE–}
PGOOD
PHASMD
TRACK/SS
39pF
ITH
220pF
39.2k
MODE/PLLIN
60.4k
10k
115k
DTR
V_RNG
RT
SGND
CLKOUT
RUN
20Ω
1nF _20Ω
0.1μF
DB2
MT2 _L2
0.47μH
R_S2
0.002Ω
+ C_OUT3
C_OUT4
330μF
100μF
MB2
w2
w2
C_IN1: PANASONIC EEEFK1V221P
C_IN2: MURATA GRM32ER71H106K
C_OUT1, C_OUT4: MURATA GRM31CR60J107ME39L
C_OUT2, C_OUT3: SANYO 2R5TPE330M9
DB1, DB2: CENTRAL SEMI CMDSH-4ETR
L1, L2: WÜRTH 7443330047
MT1, MT2: RENESAS RJK0305DPB
MB1, MB2: RENESAS RJK0330DPB
3839 F17a
100
5
V_IN = 12V _FORCED
CONTINUOUS MODE
90
4
DISCONTINUOUS
MODE
80
3
70
2
LOSS
FORCED
60 _CM
1
50
0.1
LOSS
DCM
0
1
10
100
LOAD CURRENT (A)
3839 F17b
100
5
V_IN = 5V
DISCONTINUOUS
90 _MODE
4
80
70
60
50
0.1
3
FORCED
CONTINUOUS
MODE
2
LOSS
FORCED
1
CM
LOSS
DCM
0
1
10
100
LOAD CURRENT (A)
3839 F17c
Figure 17. 6V to 26V Input, 1.2V/30A Output, 350kHz, R_SENSE, Step-Down Converter
3839fa
44