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| LTC3853 Datasheet, PDF (33/36 Pages) Linear Technology – Triple Output, Multiphase Synchronous Step-Down Controller | |||
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TYPICAL APPLICATIONS
Dual 1.2V/2.5V High Current Step-Down Converter with RSENSE
0.47μH
100Ω*
VOUT1
1.2V
30A
0.002Ω
5% 100Ω*
10k
1%
47pF
CP1,3
+ 660μF
2.5V
s2
20k
1%
4.7μF
VIN DRVCC12 INTVCC
TG1
TG2
PGOOD12
PGOOD3
BOOST1,2,3
SW1
SW2
BG1 LTC3853 BG2
1000pF*
RITH1,3
CITH1,3
MODE/PLLIN
PGND
ILIM
FREQ/PLLFLTR
SENSE1+
SENSE2+
EXTVCC
SENSE1â
VFB1
ITH1,2,3
VFB3
SGND
TK/SS1
SENSE2â
VFB2
RUN1,3
RUN2
TG3
SW3
BG3
SENSE3+
SENSE3â
TK/SS3
CSS1
0.22μF
CSS3
0.1μF
DB1,2,3
CB1,2,3 0.1μF
SW1,2,3
10k
INTVCC
1000pF*
2.55k
1000pF
0.47μH
100Ω*
0.002Ω
5%
100Ω*
200k
VOUT1
CHANNEL 1: RITH1 = 10k, CITH1 = 1500pF, CP1 = 220pF
CHANNEL 2: ITH1 AND ITH2 SHORTED TOGETHER,
TK/SS1 AND TK/SS2 SHORTED TOGETHER
CHANNEL 3: RITH3 = 13k, CITH3 = 1500pF, CP3 = 330pF
*THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC
LTC3853
VIN
180μF 6.5V TO 14V
16V
0.78μH
100Ω*
1000pF*
100Ω*
43.2k
1%
0.002Ω
5%
VOUT3
2.5V
15A
20k
+ 660μF
1%
4V
3853 TA04
3853f
33
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