LTC3738 Datasheet, PDF (10/32 Pages) Linear Technology – 3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning

LTC3738
W
FU CTIO AL DIAGRA
TSNS
PGOOD
0.66V
2.4V
FCB/SYNC
2.5µA
+
0.6V ^–
R_LP ^PLLFLTR
C_LP
FCB
PHASE DET
OSCILLATOR
IN^–
IN⁺
R_PRE-AVP
AVP
R_AVP
EAIN
80k
80k
–
A1
+
80k
80k
–+
–
+
–
+
+–
ADDER
SENSE1⁺
SENSE1^–
SENSE2⁺
SENSE2^–
SENSE3⁺
SENSE3^–
V_FB
0.600V
–
EA
+
+ ^OV
100µs
BLANKING
VID TRANSITIONS
EAIN
0.54V
V_CC/3
INTERNAL
THERMAL
DETECTION
TCMP
–
+
MUX
VR_HOTB
CLK1
CLK2
CLK3
DUPLICATE FOR SECOND AND THIRD
CONTROLLER CHANNELS
BOOST
RS
LATCH
SQ
RQ
DROP
OUT
DET
TG
TOP
FORCED BOT
TOP ON
SW
SWITCH
LOGIC
V_CC
BG
BOT
FCB
SHDN
PGND
V_CC
V_IN
D_B
C_B
–
I₁ – +
I₂
+
3mV
V_CC
30k ^SENSE+
L
R1
8k
SLOPE
COMP
5(V_FB)
30k ^SENSE–
R_SENSE
C_OUT
45k
45k
2.4V
V_OUT
0.660V
–
I_TH
C_C
R_C
VID
SELECTION
R2 VARIABLE
VRM9/VRM10 VID DECODER
V_CC
1.5µA
6V
SHDN
RST
5(V_FB)
SHED
RUN
SOFT-
START
0.600V
INTERNAL
SUPPLY
V_REF
V_CC
SGND
V_CC
+
C_CC
SS
+
C_IN
NO_CPU
1µs
OUTEN
C_SS
100k
VID5 VID0 VID1 VID2 VID3 VID4
3738 F01
Figure 1
3738f
10