LTC3857-1_15 Datasheet, PDF (32/38 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

LTC3857-1
TYPICAL APPLICATIONS
High Efficiency Dual 12V/5V Step-Down Converter
R_B1
475k
C_F1
33pF C1
R_A1
1nF
34k
C_ITH1A 100pF
SENSE1⁺
SENSE1^–
V_FB1
PGOOD1
BG1
SW1
R_ITH1 10k
C_ITH1 680pF ^{CSS1 0.01μF}
BOOST1
I_TH1
TG1
LTC3857-1
TRACK/SS1
V_IN
INTV_CC
R_FREQ
60k
C_ITH2 680pF
C_SS2 0.01μF
PLLIN/MODE
SGND
EXTV_CC
RUN1
RUN2
FREQ
PGND
TG2
BOOST2
TRACK/SS2
SW2
R_ITH2 17k
I_TH2
BG2
INTV_CC
100k
C_B1
0.47μF
D1
C_INT
4.7μF
D2
C_B2
0.47μF
MBOT1
L1
8.8μH
MTOP1
R_SENSE1
9mΩ
V_IN
C_IN ^{12.5V TO 38V}
22μF
MTOP2
L2
R_SENSE2
4.3μH 6mΩ
MBOT2
C_OUT1
47μF
V_OUT1
12V
3A
V_OUT2
5V
C_OUT2 5.5A
150μF
C_ITH2A 100pF
R_A2
75k
C2
C_{F2 1nF}
15pF
R_B2
392k
V_FB2
SENSE2^–
SENSE2⁺
C_OUT1: KEMET T525D476M016E035
C_OUT2: SANYO 10TPD150M
L1: SUMIDA CDEP105-5R7M
L2: SUMIDA CDEP105-4R3M
MTOP1, MTOP2, MBOT1, MBOT2: VISHAY Si7848DP
38571 TA03
38571fc
32