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LTC3859_15 Datasheet, PDF (36/42 Pages) Linear Technology – Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller
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LTC3859
TYPICAL APPLICATIONS
VOUT1
RA1
34k
33pF
RB1
475k
CITH1A
100pF
CITH1
680pF
RITH1
10k
CSS1
0.1μF
VOUT2
RA2
68.1k
15pF
RB2
215k
CITH2
820pF
RITH2
15k
CITH2A
150pF
LTC3859
VFB1
SENSE1–
SENSE1+
ITH1
PGOOD1
TG1
TRACK/SS1
SW1
FREQ
BOOST1
PLLIN/MODE BG1
SGND
RUN1
RUN2
VBIAS
RUN3
PGND
VFB2
EXTVCC
ITH2
INTVCC
CSS2
0.1μF
TG2
TRACK/SS2 BOOST2
VOUT3
RA3
68.1k
OPT
RB3
787k
VFB3
CITH3
0.01μF
RITH3
3.6k
CITH3A
ITH3
820pF
SW2
BG2
SENSE2+
SENSE2–
CSS3
0.1μF
SS3
TG3
100k
INTVCC
OV3
SW3
MTOP1, MTOP2: VISHAY Si7848DP
MBOT1, MBOT2: VISHAY Si7848DP
MTOP3: BSC027NO4LS
MBOT3: BSCO1BN04LS
L1: SUMIDA CDEP105-8R8M
L2: SUMIDA CDEP105-3R2M
L3: WÜRTH 744325120
COUT1: KEMET T525D476MO16E035
COUT2: SANYO 4TPE150M
CIN, COUT3: SANYO 50CE220LX
D1, D2: CMDH-4E
D3: BAS140W
BOOST3
BG3
SENSE3–
SENSE3+
3859 F13
C1
1nF
100k
CB1
0.1μF
D1
CBIAS
10μF
CINT1
4.7μF
D2
CB2
0.1μF
MTOP1
MBOT1
C1
10μF L1
8.8μH
RSENSE1
9mΩ
VOUT1
12V
3A
COUT1
47μF
C2
10μF
MTOP2 L2
3.2μH
RSENSE2
6mΩ
MBOT2
VOUT2
3.3V
5A
COUT2
150μF
C2
1nF
D3
CB3
0.1μF
MTOP3 L3
1.2μH
RSENSE2
2mΩ
MBOT3
VIN
2.5V TO 38V
(START-UP ABOVE 5V)
CIN
220μF
VOUT3
15V*
COUT3
220μF
C3
1nF
* VOUT3 IS 15V WHEN VIN < 15V,
FOLLOWS VIN WHEN VIN > 15V
Figure 13. High Efficiency Wide Input Range Dual 12V/3.3V Converter
3859fa
36
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