LTC3875_15 Datasheet, PDF (32/44 Pages) Linear Technology – Dual, 2-Phase, Synchronous Controller with Low Value DCR Sensing and Temperature Compensation

LTC3875
Applications Information
CLKOUT
TK/SS1
I_TH1
V_OSNS1+
V_OSNS–
SNSA1⁺
SNS1^–
PGOOD
LTC3875
PHASMD
IFAST
TG1
SW1
SNSD1⁺
FREQ
I_LIM
f_IN
MODE/PLLIN
BOOST1
BG1
RUN1
V_IN
RUN2
SGND
PGND
SNSA2^–
SNS2^–
SNSD2⁺
V_OSNS2–
V_OSNS2+
EXTV_CC
INTV_CC
BG2
BOOST2
I_TH2
SW2
TG2
TK/SS2
R_PU2
V_PULL-UP
PGOOD
L1
C_B1
M1
M2
C_VIN
1µF
1µF
C_INTVCC
4.7µF
C_B2
R_IN
2.2Ω
10µF ×2
CERAMIC
V_IN
C_IN
10µF ×2
CERAMIC
M3
M4
D1
(OPT)
C_OUT1
C_OUT2
D2
(OPT)
L2
V_OUT1
GND
V_OUT2
3875 F14
Figure 14. Recommended Printed Circuit Layout Diagram
32
SW1
D1
V_IN
R_IN
C_IN
BOLD LINES INDICATE
HIGH SWITCHING
CURRENT. KEEP LINES
TO A MINIMUM LENGTH.
SW2
D2
L1
V_OUT1
C_OUT1
L2
V_OUT2
C_OUT2
Figure 15. Branch Current Waveforms
For more information www.linear.com/LTC3875
R_L1
R_L2
3875 F15
3875fa