LTC3876_15 Datasheet, PDF (45/48 Pages) Linear Technology – Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing and 50mA VTT Reference

APPLICATIONS INFORMATION
LTC3876
V_IN
4.5V TO 38V
C_IN1
100μF
C_IN2
10μF
w4
VDDQ
1.2V
20A
C_OUT1
100μF
R31
L1
MT1
0.002Ω ^0.82μH
C_OUT2
330μF
w4
MB1
2.2Ω
1μF
LTC3876
V_IN
SENSE1^–
SENSE2^–
1nF
0.1μF
2.49Ω
SENSE1⁺
BOOST1
SENSE2⁺
BOOST2
TG1
TG2
DB1
2.2Ω
1μF
SW1
4.7μF
DRV_CC1
INTV_CC
BG1
SW2
DRV_CC2
EXTV_CC
BG2
PGND
20k
100k
VDDQSNS
V_OUTSENSE1+
20k
V_{OUTSENSE1–}
PGOOD _PGOOD
0.01μF
VTTRVCC
VTTSNS
VTTR
180pF
TRACK/SS1
ITH1
ITH2
560pF
13.7k
1nF
0.1μF
1.15Ω
DB2
1Ω
1μF
2.2μF
560pF
1800pF
4.22k
118k
DTR1
86.6k ^VRNG1
RT
SGND
RUN
CVCC
V_RNG2
PHASMD
MODE/PLLIN
CLKOUT
3876 F15a
MT2
L2
R32
0.82μH 0.002Ω
MB2
C_OUT4
330μF
w2
VTT
0.6V
±10A
C_OUT3
100μF
VTTR
±50mA
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
100
5.0
V_IN = 12V
VDDQ = 1.2V
4.5
90
4.0
80
3.5
DISCONTINUOUS
3.0
MODE
70
2.5
2.0
60
1.5
50
40
0.1
1.0
FORCED
CONTINUOUS 0.5
MODE
0
1
10
LOAD CURRENT (A)
3876 F15b
Figure 15. 4.5V to 38V Input, VDDQ 1.2V/20A and VTT 0.60V/±10A Output, 200kHz, R_SENSE, Step-Down Converter
3876f
45