LTC3859_15 Datasheet, PDF (38/42 Pages) Linear Technology – Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller

LTC3859
TYPICAL APPLICATIONS
V_OUT1
R_A1
115k
C_ITH1
2.2nF
C_ITH1A
100pF
R_B1
57.6k
R_ITH1
5.6k
C_SS1
0.1μF
V_OUT2
R_A2
115k
R_B2
357k
C_ITH2
3.3nF
R_ITH2
9.1k
C_ITH2A
100pF
LTC3859
V_FB1
SENSE1^–
SENSE1⁺
I_TH1
PGOOD1
TG1
TRACK/SS1
SW1
FREQ
BOOST1
PLLIN/MODE BG1
SGND
RUN1
RUN2
V_BIAS
RUN3
PGND
V_FB2
EXTV_CC
I_TH2
INTV_CC
C_SS2
0.1μF
V_OUT3
R_A3
115k
R_B3
887k
C_ITH3
100nF
R_ITH3
13k
C_ITH3A
10pF
C_SS3
0.1μF
MTOP1, MTOP2: BSZ097NO4LS
MBOT1, MBOT2: BSZ097NO4LS
MBOT3: BSZ097NO4L
L1: WURTH 744311220
L2: WURTH 744314650
L3: COOPER BUSSMANN DRQ125-100
C_OUT1: SANYO 2R5TPE220MAFB
C_OUT2: SANYO 4TPE220MAZB
C_OUT3: SANYO SVPC270M
C_IN: SANYO 50CE220LX
D1, D2: CMDH-4E
D3: DIODES INC B360A-13-F
TG2
TRACK/SS2 BOOST2
SW2
BG2
V_FB3
SENSE2⁺
I_TH3
SENSE2^–
SS3
TG3
OV3
SW3
BOOST3
BG3
SENSE3^–
SENSE3⁺
3859 F15
C1
1nF
100k
C_B1
0.1μF
D1
C_BIAS
10μF
MTOP1
MBOT1
C1
10μF _L1
2.2μH
R_SENSE1
9mΩ
V_OUT1
1.2V
3A
C_OUT1
220μF
C_INT1
4.7μF
D2
C_B2
0.1μF
C2
10μF
MTOP2 L2
6.5μH
R_SENSE2
9mΩ
MBOT2
V_OUT2
3.3V
3A
C_OUT2
220μF
C2
1nF
D3
C3
10μF
50V
MBOT3
L3
10μH
R_SENSE2
9mΩ
C_OUT3
270μF
V_OUT3
10.5V
1.2A
C3
1nF
Figure 15. High Efficiency 1.2V/3.3V Step-Down Converter with 10.5V SEPIC Converter
V_IN
5.8V TO 34V
C_IN
220μF
3859fa
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