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

LTC3857
Typical ApplicationS
High Efficiency Dual 1V/1.2V Step-Down Converter
R_B1
28.7k
C_F1
56pF C1
R_A1
1nF
115k
C_ITH1A 200pF
SENSE1⁺
SENSE1^–
V_FB1
PGOOD2
PGOOD1
BG1
SW1
R_ITH1 3.93k
C_ITH1 1000pF _{CSS1 0.01µF}
R_FREQ
60k
C_SS2 0.01µF
BOOST1
I_TH1
TG1
LTC3857
TRACK/SS1
I_LIM
PHSMD
CLKOUT
PLLIN/MODE
SGND
EXTV_CC
RUN1
RUN2
FREQ
V_IN
INTV_CC
PGND
TG2
BOOST2
C_ITH2 1000pF _{RITH2 3.93k}
TRACK/SS2
SW2
I_TH2
BG2
100k ^INTVCC
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 200pF
C2
C_{F2 1nF}
56pF
R_B2
57.6k
V_FB2
SENSE2^–
SENSE2⁺
C_OUT1, C_OUT2: SANYO 2R5TPE220M
L1: SUMIDA CDEP105-0R4
L2: SUMIDA CDEP105-0R4
MTOP1, MTOP2: RENESAS RJK0305
MBOT1, MBOT2: RENESAS RJK0328
3858 TA05
3857fa
34