LTC3839 Datasheet, PDF (36/50 Pages) Linear Technology – Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller

LTC3839
APPLICATIONS INFORMATION
V_IN
4.5V TO 26V
+ _CIN1
220μF
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
TG1
DB1
2.2Ω
1μF
SW1
4.7μF
DRV_CC1
INTV_CC
BG1
BOOST2
TG2
SW2
DRV_CC2
EXTV_CC
BG2
10k
100k
PGND
V_OUTSENSE+
10k
V_{OUTSENSE–}
PGOOD _PGOOD
0.01μF
PHASMD
22pF
220pF
90.9k
TRACK/SS
ITH
MODE/PLLIN
78.7k
115k
DTR
V_RNG
RT
SGND
CLKOUT
RUN
0.1μF 15k
0.1μF
DB2
3.57k
MT2
L2
0.56μH
+ C_OUT4
C_OUT3
330μF
100μF
MB2
w2
w2
C_IN1: PANASONIC EEEFK1V221P
C_IN2: MURATA GRM32ER71H106K
C_OUT2, C_OUT4: SANYO 2R5TPE330M9
C_OUT1, C_OUT3: MURATA GRM31CR60J107ME39L
DB1, DB2: CENTRAL SEMI CMDSH-4ETR
L1, L2: VISHAY IHLP4040DZERR56M01
MT1, MT2: RENESAS RJK0305DPB
MB1, MB2: RENESAS RJK0330DPB
3839 F13a
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 F13b
100
5
V_IN = 5V
90 ^{DISCONTINUOUS}
4
MODE
80
3
FORCED
CONTINUOUS
70
MODE
2
LOSS
60 FORCED
CM
50
0.1
1
LOSS
DCM
0
1
10
100
LOAD CURRENT (A)
3839 F13c
Figure 13. Design Example: 4.5V to 26V Input, 1.2V/30A Output, 350kHz, DCR Sense, DTR Enabled, Step-Down Converter
3839fa
36