LTC3412 LINER [Linear Technology], LTC3412 Datasheet - Page 6

• Manufacturer Part Number: LTC3412
• Description: 2.5A, 4MHz, Monolithic Synchronous Step-Down Regulator
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
LTC3412
SV
pin to SGND with a capacitor. Normally SV
PV
difference between SV
PGOOD (Pin 2/Pin 12): Power Good Output. Open-drain
logic output that is pulled to ground when the output
voltage is not within ±7.5% of regulation point.
I
The current comparator threshold increases with this
control voltage. Nominal voltage range for this pin is from
0.2V to 1.4V with 0.2V corresponding to the zero-sense
voltage (zero current).
V
voltage from a resistive divider connected across the
output.
R
resistor to ground from this pin sets the switching fre-
quency.
SYNC/MODE (Pin 6/Pin 16): Mode Select and External
Clock Synchronization Input. To select forced continuous,
tie to SV
1V selects Burst Mode operation with the burst clamp set
to the pin voltage.
6
TH
FB
T
IN
IN
U
(Pin 5/Pin 15): Oscillator Resistor Input. Connecting a
(Pin 3/Pin 13): Error Amplifier Compensation Point.
(Pin 4/Pin 14): Feedback Pin. Receives the feedback
. SV
(Pin 1/Pin 11): Signal Input Supply. Decouple this
IN
IN
. Connecting this pin to a voltage between 0V and
U
can be greater than PV
U
IN
and PV
(FE/UH Package)
IN
IN
less than 0.5V.
but keep the voltage
IN
is equal to
RUN/SS (Pin 7/Pin 1): Run Control and Soft-Start Input.
Forcing this pin below 0.5V shuts down the LTC3412. In
shutdown all functions are disabled drawing < 1μA of
supply current. A capacitor to ground from this pin sets the
ramp time to full output current.
SGND (Pin 8/Pin 2): Signal Ground. All small-signal
components, compensation components and the exposed
pad on the bottom side of the IC should connect to this
ground, which in turn connects to PGND at one point.
PV
this pin to PGND with a capacitor.
SW (Pins 10, 11, 14, 15/Pins 4, 5, 8, 9): Switch Node
Connection to the Inductor. This pin connects to the drains
of the internal main and synchronous power MOSFET
switches.
PGND (Pins 12, 13/Pins 6, 7): Power Ground. Connect
this pin close to the (–) terminal of C
Exposed Pad (Pin 17/Pin 17): Signal Ground. Must be
soldered to PCB for electrical connection and thermal
performance.
IN
(Pins 9, 16/Pins 3, 10): Power Input Supply. Decouple
IN
and C
OUT
.
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