LTC3858_15 Datasheet, PDF (32/38 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller

LTC3858
TYPICAL APPLICATIONS
High Efficiency Dual 12V/5V Step-Down Converter
R_B1
422k
C_F1
33pF C1
R_A1
1nF
30.1k
C_ITH1A 100pF
SENSE1⁺
SENSE1^–
V_FB1
PGOOD2
PGOOD1
BG1
SW1
C_ITH1 680pF
R_FREQ
60k
R_ITH1 33k
C_SS1 0.01μF
C_SS2 0.01μF
BOOST1
I_TH1
TG1
LTC3858
V_IN
SS1
I_LIM
INTV_CC
PHASMD
CLKOUT
PGND
PLLIN/MODE
SGND
EXTV_CC
TG2
RUN1
RUN2
BOOST2
FREQ
SS2
SW2
C_ITH2 680pF _{RITH2 17k}
I_TH2
BG2
100k ^INTVCC
100k
C_B1
0.47μF
D1
C_INT
4.7μF
D2
C_B2
0.47μF
MBOT1
L1
8.8μH
MTOP1
R_SENSE1
10mΩ
V_IN
C_IN ^{12.5V TO 38V}
22μF
C_OUT1
47μF
V_OUT1
12V
3A
MTOP2
L2
R_SENSE2
4.3μH 7mΩ
MBOT2
V_OUT2
5V
C_OUT2 5A
150μF
C_ITH2A 100pF
R_A2
75k
C2
C_{F2 1nF}
15pF
R_B2
393k
V_FB2
SENSE2^–
SENSE2⁺
C_OUT1: KEMET T525D476M016E035
C_OUT2: SANYO 10TPD150M
L1: SUMIDA CDEP105-8R8M
L2: SUMIDA CDEP105-4R3M
MTOP1, MTOP2, MBOT1, MBOT2: VISHAY Si7848DP
3858 TA02a
3858fc
32