LTC3857-1_15 Datasheet, PDF (34/38 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

LTC3857-1
TYPICAL APPLICATIONS
High Efficiency Dual 1V/1.2V Step-Down Converter
R_B1
28.7k
C_F1
56pF C1
R_A1
1nF
115k
C_ITH1A 220pF
SENSE1⁺
SENSE1^–
V_FB1
PGOOD1
BG1
SW1
R_ITH1 3.93k
C_ITH1 1000pF _{CSS1 0.01μF}
BOOST1
I_TH1
TG1
LTC3857-1
TRACK/SS1
V_IN
INTV_CC
R_FREQ
60k
C_ITH2 1000pF
C_SS2 0.01μF
R_ITH2 3.43k
PLLIN/MODE
SGND
EXTV_CC
RUN1
RUN2
FREQ
PGND
TG2
BOOST2
TRACK/SS2
SW2
I_TH2
BG2
INTV_CC
100k
C_B1
0.47μF
D1
C_INT
4.7μF
D2
C_B2
0.47μF
MBOT1
L1
0.47μH
MTOP1
R_SENSE1
3.5mΩ
V_IN
C_IN ^12V
22μF
C_OUT1
220μF
s2
V_OUT1
1V
8A
MTOP2
L2
R_SENSE2
0.47μH 3.5mΩ
MBOT2
V_OUT2
1.2V
C_{OUT2 8A}
220μF
s2
R_A2
115k
C_ITH2A 220pF
C2
C_{F2 1nF}
56pF
R_B2
57.6k
V_FB2
SENSE2^–
SENSE2⁺
C_OUT1, C_OUT2: SANYO 2R5TPE220M
L1: SUMIDA CDEP105-3R2M
L2: SUMIDA CDEP105-7R2M
MTOP1, MTOP2: RENESAS RJK0305
MBOT1, MBOT2: RENESAS RJK0328
38571 TA05
38571fc
34