LTC1628 LINER [Linear Technology], LTC1628 Datasheet - Page 9

• Manufacturer Part Number: LTC1628
• Description: High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
FU CTIO AL DIAGRA
FLTCPL (Pin 28): (LTC1628 Only) Fault Coupling Control
Pin that determines if fault/normal conditions on one
controller will act on the other controller. FLTCPL = INTV
to couple channels; FLTCPL = 0V to decouple.
R6
R5
U
V
U
IN
+
V
5V
SEC
FREQSET
STBYMD
3.3V
FLTCPL
EXTV
INTV
SGND
FCB
V
IN
OUT
CC
0.18 A
CC
U
U
3V
MERGE LOGIC
OSCILLATOR
4.8V
+
–
1.19V
4.5V
0.8V
1M
–
U
+
+
–
–
+
CLK1
CLK2
RUN/SS1
RUN/SS2
INTERNAL
SUPPLY
V
LDO
REG
5V
REF
BINH
FCB
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
W
1.2 A
6V
4(V
0.86V
FB
SLOPE
COMP
)
I1
S
R
+
–
0.55V
Q
Q
–
DROP
OUT
DET
CC
45k
Figure 2
+
–
+
4(V
SHDN
+
RST
FB
B
3mV
)
BOT
TOP ON
PGOOD (Pin 28): (LTC1628-PG Only) Open-Drain Logic
Output. PGOOD is pulled to ground when the voltage on
either V
–
SHDN
FCB
START
45k
SOFT
RUN
+
–
OV
2.4V
EA
I2
OSENSE
SWITCH
–
+
+
–
LOGIC
V
FB
0.80V
0.86V
LTC1628/LTC1628-PG
TOP
BOT
INTV
pin is not within 7.5% of its set point.
CC
INTV
30k
30k
CC
V
SENSE
SENSE
RUN/SS
BOOST
PGND
OSENSE
SW
BG
I
TG
TH
+
–
INTV
CC
R1
D
C
C
C
B
R2
C2
SS
B
D
C
SEC
C
V
IN
R
C
R
D
SENSE
1
+
C
C
IN
SEC
9