Datasheet

LTC3876
45
3876f
Figure 15. 4.5V to 38V Input, VDDQ 1.2V/20A and VTT 0.60V/±10A Output, 200kHz, R
SENSE
, Step-Down Converter
APPLICATIONS INFORMATION
4.22k
3876 F15a
1nF
0.1µF
1µF
560pF
1800pF
L2
0.82µH
C
OUT3
100µF
C
OUT4
330µF
w2
VTT
0.6V
±10A
DB2
MT2
MB2
LTC3876
2.2
R31
0.002
2.2
20k
VTTR
±50mA
1
100k
13.7k
86.6k
118k
V
IN
1µF
1nF
4.7µF
0.1µF
0.01µF
180pF
560pF
C
OUT2
330µF
w4
C
OUT1
100µF
VDDQ
1.2V
20A
V
IN
4.5V TO 38V
20k
SENSE1
–
SENSE1
+
BOOST1
TG1
SW1
SENSE2
+
BOOST2
TG2
SW2
DRV
CC1
INTV
CC
DRV
CC2
EXTV
CC
DB1
MT1
R32
0.002
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
L1
0.82µH
1µF
C
IN2
10µF
w4
C
IN1
100µF
2.2µF
C
IN1
: NICHICON UCJ1H101MCL1GS
C
IN3
, C
IN4
, C
IN5
: MURATA GRM32ER71H106K
C
OUT1
, C
OUT2
, C
OUT5
: SANYO 2R5TPE330M9
C
OUT4
, C
OUT7
: MURATA GRM31CR60J107ME39L
DB1, DB2: CENTRAL SEMI CMDSH-3
L1: WÜRTH 744315067
L2: WÜRTH 744311068
MT1: INFINEON BSC035N04LS
MB1 MB2: INFINEON BSC011N03LS
MT2: VISHAY SiR462DP
2.49 1.15
LOAD CURRENT (A)
0.1
EFFICIENCY (%)
POWER LOSS (W)
90
100
110
3876 F15b
60
50
40
80
70
5.0
4.0
4.5
1.5
0.5
1.0
0
3.0
3.5
2.5
2.0
FORCED
CONTINUOUS
MODE
DISCONTINUOUS
MODE
V
IN
= 12V
VDDQ = 1.2V