ltc3731cuh-trpbf Linear Technology Corporation, ltc3731cuh-trpbf Datasheet - Page 9

• Manufacturer Part Number: ltc3731cuh-trpbf
• Description: 3-phase, 600khz, Synchronous Buck Switching Regulator Controller
• Manufacturer: Linear Technology Corporation

FU CTIO AL DIAGRA
PGOOD**
*THE LTC3731UH USES THE EXPOSED DIE ATTACH PAD FOR THE SGND CONNECTIONS
**THE PHASMD AND PGOOD PIN FUNCTIONS ARE TIED TOGETHER IN THE LTC3731 UH PACKAGE
***LTC3731CG/IG ONLY
R1
U
F
IN
R
C
R2
LP
LP
PHASMD**
PLLFLTR
DIFFOUT
CLKOUT
R
UVADJ
PLLIN
EAIN
C
DELAY
C
100µs
FCB
IN
IN
I
1.2V
TH
C
–
+
0.600V
0.660V
U
PROTECTION
0.6V
50k
+
–
V
FB
+
–
40k
40k
OSCILLATOR
PHASE DET
+
–
–
+
EA
OV
40k
40k
FCB
–
+
A1
–
–
+
+
CLK1
CLK2
CLK3
0.66V
0.54V
EAIN
W
DUPLICATE FOR SECOND AND THIRD
CONTROLLER CHANNELS
LATCH
RS
V
CC
6V
5(V
1.5µA
0.86V
FB
SLOPE
COMP
CLAMP
)
S
R
SS
I
1
Figure 2
5(V
–
+
SHDN
0.55V
Q
Q
RST
FB
–
2.4V
FCB
)
DROP
OUT
DET
+
START
+
SOFT-
54k
SHED
RUN
B
3mV
BOT
FORCE BOT
–
SHDN
FCB
54k
UV RESET
+
–
I
2
INTERNAL
SWITCH
LOGIC
SUPPLY
0.600V
1.2V
TOP
BOT
V
CC
V
CC
36k
36k
V
(VDR)***
REF
SENSE
SENSE
BOOST
RUN/SS
SGND*
PGND
SW
V
BG
TG
CC
+
–
+
V
R
CC
V
SENSE
CC
C
C
D
CC
SS
C
B
B
LTC3731
L
V
IN
+
3731fb
9
C
IN