LTC3857 Datasheet, PDF (35/38 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

LTC3857
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
PGOOD1
BG1
SW1
R_ITH1 3.93k
C_ITH1 1000pF _{CSS1 0.01µF}
BOOST1
I_TH1
TG1
LTC3857
TRACK/SS1
V_IN
INTV_CC
R_FREQ
65k
C_ITH2 1000pF
C_SS2 0.01µF
R_ITH2 3.93k
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
V_IN
C_IN ^12V
22µF
MTOP2
L2
0.47µH
MBOT2
C_OUT1
220µF
s2
V_OUT1
1V
8A
V_OUT2
1.2V
C_{OUT2 8A}
220µF
s2
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
3857 TA06
3857fa
35