ltc1709-85 Linear Technology Corporation, ltc1709-85 Datasheet - Page 9

• Manufacturer Part Number: ltc1709-85
• Description: 2-phase, 5-bit Vid, Current Mode, High Efficiency, Synchronous Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

FU CTIO AL DIAGRA
f
IN
U
V
R
C
IN
5V
+
LP
LP
ATTENOUT
PLLFLTR
DIFFOUT
ATTENIN
PGOOD
EXTV
INTV
PLLIN
SGND
V
V
FCB
V
OS
OS
IN
CC
–
+
0.18 A
CC
50k
U
10k
3V
OSCILLATOR
4.8V
PHASE DET
0.80V
4.5V
R1
+
–
–
+
A1
+
–
–
+
–
–
CLK1
CLK2
TO SECOND
CHANNEL
+
+
INTERNAL
SUPPLY
V
LDO
REG
5V
REF
0.86V
EAIN
0.74V
FCB
VID25mV
W
VID0
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
5-BIT VID DECODER
VID1
6V
1.2 A
VID2
4(V
0.86V
FB
SLOPE
COMP
)
VID3
I
S
R
1
0.55V
–
+
Q
Q
–
TYPICAL ALL
40k
DROP
VID PINS
OUT
DET
45k
+
–
+
B
4(V
SHDN
+
RST
FB
)
BOT
V
TOP ON
–
BIAS
SHDN
FCB
START
45k
SOFT
RUN
OV
+
–
2.4V
EA
I
2
SWITCH
–
+
+
–
LOGIC
V
FB
0.80V
0.86V
TOP
BOT
INTV
CC
INTV
30k
30k
CC
SENSE
SENSE
RUN/SS
BOOST
PGND
EAIN
SW
TG
BG
I
TH
+
–
INTV
CC
C
C
D
C2
C
C
B
B
C
R
LTC1709-85
SS
C
V
IN
R
SENSE
D1
+
C
IN
170985f
9