LTC3855_15 Datasheet, PDF (31/44 Pages) Linear Technology – Dual, Multiphase Synchronous DC/DC Controller with Differential Remote Sense

Applications Information
LTC3855
CLKOUT
TK/SS1
I_TH1
V_FB1
SENSE1⁺
LTC3855
PGOOD
DIFFP
DIFFN
DIFFOUT
TG1
SENSE1^–
SW1
FREQ
I_LIM
f_IN
MODE/PLLIN
RUN1
RUN2
SGND
SENSE2^–
SENSE2⁺
BOOST1
BG1
V_IN
PGND
EXTV_CC
INTV_CC
BG2
V_FB2
I_TH2
TK/SS2
BOOST2
SW2
TG2
R_PU2
V_PULL-UP
PGOOD
L1
R_SENSE
C_B1
M1
M2
D1
C_VIN
C_INTVCC
C_B2
1µF
CERAMIC
R_IN
V_IN
C_IN
1µF
CERAMIC
M3
M4
C_OUT1
C_OUT2
D2
R_SENSE
L2
3855 F14
Figure 14. Recommended Printed Circuit Layout Diagram
V_OUT1
GND
V_OUT2
SW1
D1
V_IN
R_IN
C_IN
BOLD LINES INDICATE
HIGH SWITCHING
CURRENT. KEEP LINES
TO A MINIMUM LENGTH.
SW2
D2
L1
R_{SENSE1 VOUT1}
C_OUT1
L2
R_{SENSE2 VOUT2}
C_OUT2
Figure 15. Branch Current Waveforms
R_L1
R_L2
3855 F15
3855f
31