LTC3853 Datasheet, PDF (32/36 Pages) Linear Technology – Triple Output, Multiphase Synchronous Step-Down Controller

LTC3853
TYPICAL APPLICATIONS
Triple 3.3V/2.5V/12V, 5A Step-Down Converter with R_SENSE Synchronized at 400kHz
M1
3.3μH
4.7μF
V_IN DRV_CC12 INTV_CC
D_B1,2,3
M2
M3
TG1
PGOOD12
TG2
C_B1,2,3 0.1μF
2.2μH
PGOOD3
BOOST1,2,3
SW1,2,3
SW1
SW2
BG1 LTC3853 BG2
10Ω*
0.008Ω
5%
ILIM
PGND
10Ω*
V_OUT1
3.3V
5A
0.008Ω
5% _10Ω*
63.4k
1%
10pF
C_P1,2,3
+
220μF 20k
4V
1%
1000pF* ^PLLIN
400kHz
R_ITH1,2,3
C_ITH1,2,3
FREQ/PLLFLTR
SENSE1⁺
SENSE2⁺
MODE/PLLIN
SENSE1^–
V_FB1
I_TH1,2,3
SENSE2^–
V_FB2
RUN1,2,3
V_FB3
TG3
SW3
SGND
BG3
SENSE3⁺
EXTV_CC
SENSE3^–
TK/SS1,2,3
1000pF*
10k
1000pF
43.2k
1%
20k
1%
10Ω*
10pF
+
V_OUT2
2.5V
5A
220μF
4V
C_SS1,2,3
0.1μF
10nF
33μF
35V
V_IN
13V TO 24V
6.8μH
10Ω*
1000pF*
10Ω*
140k
1%
22pF
0.011Ω
5%
V_OUT3
12V
4A
10k
+ _220μF
1%
16V
M1, M2, M3: Si4816BDY
CHANNEL 1: R_ITH1 = 18k, C_ITH1 = 1500pF, C_P1 = 220pF
CHANNEL 2: R_ITH2 = 18k, C_ITH2 = 1500pF, C_P2 = 220pF
CHANNEL 3: R_ITH3 = 43k, C_ITH3 = 470pF, C_P3 = 330pF
*THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC
3853 TA02
Triple 1.8V/1.2V/2.5V, 15A High Current Step-Down Converter with R_SENSE, f_SW = 400kHz
M1
0.56μH
M2
100Ω*
V_OUT1
1.8V
15A
0.002Ω
5% _100Ω*
24.9k
1%
22pF
C_P1,2,3
+
660μF 20k
2.5V 1%
4.7μF
V_IN DRV_CC12 INTV_CC
TG1
TG2
PGOOD12
PGOOD3
BOOST1,2,3
SW1
SW2
BG1 LTC3853 BG2
1000pF*
R_ITH1,2,3
C_ITH1,2,3
MODE/PLLIN
PGND
ILIM
FREQ/PLLFLTR
SENSE1⁺
SENSE2⁺
SENSE1^–
V_FB1
I_TH1,2,3
SENSE2^–
V_FB2
RUN1,2,3
V_FB3
TG3
SW3
SGND
BG3
SENSE3⁺
EXTV_CC
SENSE3^–
TK/SS1,2,3
C_SS1,2,3
0.1μF
D_B1,2,3
C_B1,2,3 0.1μF
SW1,2,3
M3
0.47μH
10k
INTV_CC
1000pF*
2.55k
1000pF
M4
100Ω*
0.002Ω
5%
10k
1%
20k
1%
100Ω*
47pF
+
V_OUT2
1.2V
15A
660μF
2.5V
M1, M3, M5: RJK0305DPB
M2, M4, M6: RJK0301DPB
CHANNEL 1: R_ITH1 = 15k, C_ITH1 = 1500pF, C_P1 = 330pF
CHANNEL 2: R_ITH2 = 10k, C_ITH2 = 1500pF, C_P2 = 220pF
CHANNEL 3: R_ITH3 = 13k, C_ITH3 = 1500pF, C_P3 = 330pF
*THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC
32
V_IN
180μF ^{6.5V TO 14V}
16V
M5
0.78μH
M6
100Ω*
1000pF*
100Ω*
43.2k
1%
0.002Ω
5%
V_OUT3
2.5V
15A
20k
+ _660μF
1%
4V
3853 TA03
3853f