ltc3787gn Linear Technology Corporation, ltc3787gn Datasheet - Page 20

• Manufacturer Part Number: ltc3787gn
• Description: Ltc3787 - Polyphase Synchronous Boost Controller
• Manufacturer: Linear Technology Corporation

applicaTions inForMaTion
LTC3787
Tying the PHASMD pin to INTV
generates a phase difference (between PLLIN/MODE
and CLKOUT) of 240°, 60° or 90°, respectively, and a
phase difference (between CH1 and CH2) of 120°, 180°
20
V
OUT
V
OUT
PLLIN/MODE
PHASMD
PLLIN/MODE
PHASMD
VFB
VFB
PLLIN/MODE
PHASMD
VFB
LTC3787
LTC3787
210,30
0,180
V
V
LTC3787
OUT
OUT
CLKOUT
CLKOUT
0,180
CC
RUN
RUN
ITH
ITH
SS
SS
, SGND or floating
INTV
CLKOUT
RUN
CC
ITH
SS
PLLIN/MODE
PHASMD
VFB
PLLIN/MODE
PHASMD
VFB
+60
+60
LTC3787
LTC3787
Figure 4. PolyPhase Operation
0,240
0,180
+60
CLKOUT
CLKOUT
(4d) 12-Phase Operation
(4a) 3-Phase Operation
(4b) 4-Phase Operation
(4c) 6-Phase Operation
PLLIN/MODE
PHASMD
VFB
PLLIN/MODE
PHASMD
VFB
RUN
RUN
ITH
ITH
SS
SS
PLLIN/MODE
PHASMD
VFB
LTC3787
LTC3787
60,240
270,90
+120
LTC3787
+90
60,240
CLKOUT
CLKOUT
RUN
RUN
ITH
ITH
SS
SS
CLKOUT
or 180°. Figure 4 shows the connections necessary for
3-, 4-, 6- or 12-phase operation. A total of 12 phases can
be cascaded to run simultaneously out-of-phase with
respect to each other.
RUN
ITH
SS
120, CHANNEL 2 NOT USED
PLLIN/MODE
PHASMD
PLLIN/MODE
PHASMD
VFB
VFB
+60
+60
LTC3787
90,270
LTC3787
+60
CLKOUT
CLKOUT
PLLIN/MODE
PHASMD
VFB
PLLIN/MODE
PHASMD
VFB
RUN
RUN
ITH
ITH
SS
SS
PLLIN/MODE
PHASMD
VFB
LTC3787
LTC3787
120,300
330,150
LTC3787
120,300
CLKOUT
CLKOUT
RUN
RUN
ITH
ITH
SS
SS
CLKOUT
RUN
ITH
SS
3787 F04
+90
3787fa