LTC3853_15 Datasheet, PDF (31/36 Pages) Linear Technology – Triple Output, Multiphase Synchronous Step-Down Controller

LTC3853
APPLICATIONS INFORMATION
M1
1.5µH
10Ω*
V_OUT1
2.5V
5A
0.008Ω
5% _10Ω*
43.2k
1%
10pF
C_P1,2,3
+ _{220µF 20k}
4V
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
M2
1.5µH
10k
INTV_CC
1000pF*
3.16k
1000pF
10Ω*
0.008Ω
5%
24.9k
1%
20k
1%
10Ω*
+
V_OUT2
1.8V
5A
220µF
4V
M1, M2, M3: Si4816BDY
CHANNEL 1: R_ITH1 = 18k, C_ITH1 = 1500pF, C_P1 = 220pF
CHANNEL 2: R_ITH2 = 12k, C_ITH2 = 1500pF, C_P2 = 220pF
CHANNEL 3: R_ITH3 = 18k, C_ITH3 = 1500pF, C_P3 = 220pF
*THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC
33µF
35V
V_IN
7V TO 24V
M3
2.2µH
10Ω*
1000pF*
10Ω*
63.4k
1%
10pF
0.008Ω
5%
V_OUT3
3.3V
5A
20k
+ _220µF
1%
4V
3853 F15
Figure 15. Triple 2.5V/1.8V/3.3V 5A Step-Down Converter with R_SENSE, f_SW = 500kHz
For more information www.linear.com/LTC3853
3853fc
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