LTC3418 Datasheet, PDF (6/20 Pages) Linear Technology – 8A, 4MHz, Monolithic Synchronous Step-Down Regulator

LTC3418
PI FU CTIO S
V_FB (Pin 25): Feedback Pin. Receives the feedback voltage
from a resistive divider connected across the output.
I_TH (Pin 26): Error Amplifier 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 voltage
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.
BLOCK DIAGRA
V_REF
16
TRACK
35
25 ^VFB
0.74V
0.86V
24
SV_IN
8
26
SGND I_TH
PV_IN
3 29
VOLTAGE
REFERENCE
ERROR
+
AMPLIFIER
–
+
SYNC/MODE
+
–
SLOPE
COMPENSATION
RECOVERY
BURST
COMPARATOR
–
BCLAMP
4 28
PMOS CURRENT 9 23
COMPARATOR
10 22
+
OSCILLATOR
SLOPE
COMPENSATION
SW
12
11 12
20 21
+
30 31
LOGIC
NMOS
–
CURRENT
COMPARATOR
RUN/SS
7
RUN
PGOOD
5
CURRENT
REVERSE
COMPARATOR
R_T
SYNC/MODE
6
27
PGND
13 32
14 33
15 34
17 36
18 37
19 38
3418 BD
6
3418f