LTC3733_15 Datasheet, PDF (10/32 Pages) Linear Technology – 3-Phase, Buck Controllers for AMD CPUs

LTC3733/LTC3733-1
W
FU CTIO AL DIAGRA
PLLIN
(LTC3733-1 ONLY)
F_IN
50k
R_LP ^PLLFLTR
C_LP
2.4V
2.5µA
FCB
+
0.6V ^–
PGOOD
PHASE DET
OSCILLATOR
FCB
CLK1
CLK2
CLK3
0.66V
120µs
BLANKING
VID TRANSITIONS
IN^–
40k
40k
EAIN
0.54V
IN⁺
DIFFOUT
EAIN
I_TH
C_C
R_C
–
A1
+
40k
40k
V_FB
0.600V
0.660V
–
EA
+
+ ^OV
–
R1
6.667k
R2 VARIABLE
5-BIT VID DECODER
VID0 VID1 VID2 VID3 VID4
DUPLICATE FOR SECOND AND THIRD
CONTROLLER CHANNELS
V_CC
V_IN
BOOST
D_B
RS
LATCH
DROP
OUT
DET
BOT
TG
C_B
TOP
FORCE BOT
SQ
SW
RQ
SWITCH
LOGIC
V_CC (DRV_CC IN
THE LTC3733-1)
0.55V
+B
–
FCB
SHDN
BG
BOT
PGND
+
C_IN
–
I₁ – +
I₂
+
3mV
SLOPE
COMP
5(V_FB)
45k
45k
2.4V
L
V_CC
30k ^SENSE+
30k ^SENSE–
R_SENSE
C_OUT
V_OUT
V_CC
1.5µA
6V
SHDN
RST
5(V_FB)
SHED
RUN
SOFT-
START
NO_CPU
1µs
0.600V
INTERNAL
SUPPLY
V_REF
V_CC
SGND
V_CC
+
C_CC
SS
RUN
C_SS
100k
3733 F02
Figure 2
3733f
10