LTC3853 Datasheet, PDF (34/36 Pages) Linear Technology – Triple Output, Multiphase Synchronous Step-Down Controller

LTC3853
TYPICAL APPLICATIONS
Three Phase 2.5V Output High Current Step-Down Converter with R_SENSE
0.78μH
V_OUT1
2.5V
40A
100Ω*
0.002Ω
5% _100Ω*
43.2k
1%
47pF
C_P1
+
660μF
4V
s3
20k
1%
4.7μF
V_IN DRV_CC12 INTV_CC
TG1
TG2
PGOOD12
PGOOD3
BOOST1,2,3
SW1
SW2
BG1 LTC3853 BG2
1000pF*
R_ITH1
C_ITH1
MODE/PLLIN
PGND
ILIM
FREQ/PLLFLTR
SENSE1⁺
SENSE2⁺
EXTV_CC
SENSE1^–
SENSE2^–
V_FB1
V_FB2
V_FB3
I_TH1
I_TH2
I_TH3
SGND
RUN1
RUN2
RUN3
TG3
SW3
BG3
SENSE3⁺
SENSE3^–
TK/SS1
C_SS1
0.33μF
D_B1,2,3
C_B1,2,3 0.1μF
SW1,2,3
0.78μH
10k
INTV_CC
1000pF*
0.002Ω
100Ω* _5%
100Ω*
V_OUT1
2.55k
1000pF
R_ITH1 = 3.9k, C_ITH1 = 10nF, C_P1 = 470pF • 3
SHORT TK/SS1, TK/SS2 AND TK/SS3 TOGETHER
*THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC
V_IN
180μF ^{6.5V TO 14V}
16V
0.78μH
100Ω*
1000pF*
100Ω*
0.002Ω
5%
V_OUT1
3853 TA05
3853f
34