Datasheet
LTC3418
6
3418fb
BLOCK DIAGRAM
PIN FUNCTIONS
V
REF
(Pin 16): Reference Output. Decouple this pin with
a 2.2μF capacitor.
SV
IN
(Pin 24): Signal Input Supply. Decouple this pin to
SGND with a capacitor.
V
FB
(Pin 25): Feedback Pin. Receives the feedback voltage
from a resistive divider connected across the output.
I
TH
(Pin 26): Error Amplifi er Compensation Point. The
current comparator threshold increases with this control
voltage. Nominal voltage range for this pin is from 0.2V
to 1.4V with 0.4V corresponding to the zero-sense voltage
(zero current).
SYNC/MODE (Pin 27): Mode Select and External Clock
Synchronization Input. To select Forced Continuous, tie
to SV
IN
. Connecting this pin to a voltage between 0V and
1V selects Burst Mode operation with the burst clamp set
to the pin voltage.
TRACK (Pin 35): Voltage Tracking Input. Feedback volt-
age will regulate to the voltage on this pin during start-up
power sequencing.
Exposed Pad (Pin 39): The Exposed Pad is PGND and must
be soldered to the PCB ground for electrical connection
and rated thermal performance.
–
+
–
+
–
+
–
+
–
+
–
+
SLOPE
COMPENSATION
RECOVERY
OSCILLATOR
NMOS
CURRENT
COMPARATOR
CURRENT
REVERSE
COMPARATOR
SLOPE
COMPENSATION
LOGIC
ERROR
AMPLIFIER
BURST
COMPARATOR
PMOS CURRENT
COMPARATOR
PV
IN
VOLTAGE
REFERENCE
35
TRACK
25
V
FB
5
PGOOD
7
RUN/SS
RUN
0.74V
SYNC/MODE
0.86V
16
26
10
9
4
3
V
REF
I
TH
SYNC/MODE
BCLAMP
8
SGND
24
SV
IN
+
22
1 2
11 12
20 21
30 31
23
28
29
SW
13 32
14 33
15 34
17 36
18 37
1927
R
T
6 38
PGND
3418 BD
–
+