LTC3876_15 Datasheet, PDF (44/48 Pages) Linear Technology – Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing and 50mA VTT Reference

LTC3876
APPLICATIONS INFORMATION
V_IN
4.5V TO 28V
C_IN1
100μF
C_IN2
10μF
w3
VDDQ
1V
20A
C_OUT1
100μF
L1
MT1
R31
0.67μH
0.002Ω
C_OUT2
330μF
w2
MB1
113k
20k
2.2Ω
1μF
100Ω
100Ω
1nF
0.1μF
LTC3876
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
PGND
30.1k
100k
VDDQSNS
V_OUTSENSE1+
20k
V_{OUTSENSE1–}
PGOOD _PGOOD
0.1μF
VTTRVCC
VTTSNS
VTTR
220pF
TRACK/SS1
ITH1
ITH2
220pF
18.2k
100Ω
1nF100Ω
0.1μF
DB2
1Ω
1μF
2.2μF
1000pF
2700pF
2.55k
205k
DTR1
V_RNG1
RT
SGND
RUN
CVCC
V_RNG2
PHASMD
MODE/PLLIN
CLKOUT
3876 F14a
MT2
L2
R32
0.68μH 0.003Ω
MB2
C_OUT4
330μF
VTT
0.5V
±10A
C_OUT3
100μF
VTTR
±50mA
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
100
4.0
V_IN = 12V
VDDQ = 1V
3.5
90
3.0
80
DISCONTINUOUS
MODE
2.5
70
2.0
60
50
40
0.1
1.5
1.0
FORCED
CONTINUOUS
0.5
MODE
0
1
10
LOAD CURRENT (A)
3876 F14b
Figure 14. 4.5V to 28V Input, VDDQ 1V/20A and VTT 0.50V/±10A Output, 200kHz, R_SENSE, Step-Down Converter
3876f
44