ltc3890 Linear Technology Corporation, ltc3890 Datasheet - Page 10

• Manufacturer Part Number: ltc3890
• Description: 60v Low Iq, Dual, 2-phase Synchronous Step-down Dc/dc Controller
• Manufacturer: Linear Technology Corporation

LTC3890
FUNCTIONAL DIAGRAM
10
PLLIN/MODE
PGOOD1
PGOOD2
EXTV
FREQ
I
V
27
14
LIM
28
22
20
2
5
IN
4.7V
CC
+
–
20μA
100k
EN
5.1V
LDO
33
+
–
+
–
+
–
+
–
SGND
0.88V
0.72V
0.88V
0.72V
V
V
SYNC
FB1
FB2
DET
CURRENT
LIMIT
EN
C
5.1V
LDO
19
LP
PHASMD
VCO
INTV
3
CC
CLK1
CLKOUT
CLK2
PFD
4
RUN
7, 8
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
11V
7μA (RUN1)
0.5μA (RUN2)
0.65V
2.7V
SLOPE COMP
2(V
ICMP
SHDN
RST
FB
S
R
0.425V
)
–
+
–
Q
Q
+
FOLDBACK
DROP
OUT
DET
+
–
3mV
+ –
TOP ON
SHDN
SLEEP
BOT
+
–
OV
IR
SWITCH
SHDN
LOGIC
EA
+
–
+
–
TOP
BOT
0.80V
TRACK/SS
0.88V
INTV
1μA
CC
TRACK/SS
SENSE
SENSE
BOOST
25, 16
24, 17
26, 15
23, 18
32, 10
31, 11
30, 12
29, 13
PGND
SW
1, 9
V
ITH
BG
TG
21
FB
+
–
INTV
R
CC
A
C
C
C
D
C
C2
SS
R
C
B
B
B
V
L
IN
R
C
R
SENSE
C
IN
3890f