LTC3850-1_15 Datasheet, PDF (26/38 Pages) Linear Technology – Dual, 2-Phase Synchronous Step-Down Switching Controller

LTC3850/LTC3850-1
APPLICATIONS INFORMATION
TK/SS1
I_TH1
V_FB1
SENSE1⁺
SENSE1^–
PGOOD
TG1
SW1
PLLLPF
BOOST1
I_LIM
BG1
f_IN
MODE/PLLIN
V_IN
RUN1
RUN2
PGND
SGND
EXTV_CC
SENSE2^–
INTV_CC
SENSE2⁺
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
38501 F12
Figure 12. Recommended Printed Circuit Layout Diagram
V_OUT1
GND
V_OUT2
26
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 13. Branch Current Waveforms
R_L1
R_L2
38501 F13
38501fc