Datasheet

LTC3876
44
3876f
Figure 14. 4.5V to 28V Input, VDDQ 1V/20A and VTT 0.50V/±10A Output, 200kHz, R
SENSE
, Step-Down Converter
APPLICATIONS INFORMATION
2.55k
3876 F14a
1nF
0.1µF
1µF
1000pF
2700pF
L2
0.68µH
C
OUT3
100µF
C
OUT4
330µF
VTT
0.5V
±10A
100
100
DB2
MT2
MB2
R32
0.003
LTC3876
2.2
2.2
30.1k
VTTR
±50mA
1
100k
18.2k
205k
113k
20k
V
IN
1µF
1nF
4.7µF
0.1µF
0.1µF
220pF
220pF
L1
0.67µH
C
OUT2
330µF
w2
C
OUT1
100µF
VDDQ
1V
20A
V
IN
4.5V TO 28V
100
100
20k
SENSE1
–
SENSE1
+
BOOST1
TG1
SW1
SENSE2
+
BOOST2
TG2
SW2
DRV
CC1
INTV
CC
DRV
CC2
EXTV
CC
DB1
MT1
0.002
R31
SENSE2
–
BG1 BG2
VTTRVCC
PGND
V
OUTSENSE1
+
VDDQSNS
V
OUTSENSE1
–
PGOOD VTTR
VTTSNS
TRACK/SS1
ITH1
DTR1
V
RNG1
ITH2
CVCC
PHASMD
MODE/PLLIN
CLKOUT
V
RNG2
SGND
RUN
RT
PGOOD
MB1
1µF
C
IN2
10µF
w3
C
IN1
100µF
2.2µF
C
IN1
: NICHICON UCJ1H101MCL1GS
C
IN2
: MURATA GRM32ER71H106K
C
OUT2
,C
OUT4
: SANYO 2R5TPE330M9
C
OUT1
, C
OUT3
: MURATA GRM31CR60J107ME39L
DB1, DB2: CENTRAL SEMI CMDSH-3
L1: WÜRTH 744315067
L2: WÜRTH 744311068
MT1: INFINEON BSC035N04LS
MB1, MB2: INFINEON BSC011N03LS
MT2: VISHAY SiR462DP
LOAD CURRENT (A)
0.1
EFFICIENCY (%)
POWER LOSS (W)
90
100
110
3876 F14b
60
50
40
80
70
4.0
1.5
0.5
1.0
0
3.0
3.5
2.5
2.0
FORCED
CONTINUOUS
MODE
DISCONTINUOUS
MODE
V
IN
= 12V
VDDQ = 1V