LTC3858_15 Datasheet, PDF (35/38 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller

LTC3858
TYPICAL APPLICATIONS
High Efficiency Dual 1V/1.2V Step-Down Converter with Inductor DCR Current Sensing
R_B1
28.7k
R_S1 1.18k
R_A1
115k
C_F1
56pF C1
0.1μF
C_ITH1A 200pF
SENSE1⁺
SENSE1^–
V_FB1
PGOOD2
PGOOD1
BG1
SW1
R_ITH1 3.93k
C_ITH1 1000pF _{CSS1 0.01μF}
R_FREQ
65k
C_SS2 0.01μF
BOOST1
I_TH1
TG1
LTC3858
SS1
I_LIM
PHASMD
CLKOUT
SGND
EXTV_CC
RUN1
RUN2
FREQ
V_IN
INTV_CC
PGND
TG2
BOOST2
SS2
C_ITH2 1000pF _{RITH2 3.93k}
I_TH2
SW2
BG2
INTV_CC
100k
100k
C_B1
0.47μF
D1
C_INT
4.7μF
D2
C_B2
0.47μF
MBOT1
L1
0.47μH
MTOP1
V_IN
C_IN ^12V
22μF
MTOP2
L2
0.47μH
MBOT2
R_A2
115k
C_ITH2A 220pF
C2
C_{F2 0.1μF}
56pF
R_B2
57.6k
V_FB2
SENSE2^–
SENSE2⁺
R_S2 1.18k
C_OUT1, C_OUT2: SANYO 2R5TPE220M
L1, L2: VISHAY IHL P2525CZERR47M06
MTOP1, MTOP2: RENESAS RJK0305
MBOT1, MBOT2: RENESAS RJK0328
3858 TA05
C_OUT1
220μF
×2
V_OUT1
1V
8A
V_OUT2
1.2V
C_{OUT2 8A}
220μF
×2
3858fc
35