LTC3412A Linear Technology, LTC3412A Datasheet - Page 7

• Manufacturer Part Number: LTC3412A
• Description: 3A/ 4MHz/ Monolithic Synchronous Step-Down Regulator
• Manufacturer: Linear Technology

PI FU CTIO S
SV
pin to SGND with a capacitor.
PGOOD (Pin 2/Pin 12): Power Good Output. Open-drain
logic output that is pulled to ground when the output volt-
age 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 0.4V corresponding to the zero-sense
voltage (zero current).
V
voltage from a resistive divider connected across the
output.
R
a resistor to ground from this pin sets the switching
frequency.
SYNC/MODE (Pin 6/Pin 16): Mode Select and External
Clock Synchronization Input. To select forced continuous,
tie to SV
and 1V selects Burst Mode operation with the burst clamp
set to the pin voltage.
TH
FB
T
U
IN
(Pin 5/Pin 15): Oscillator Resistor Input. Connecting
(Pin 3/Pin 13): Error Amplifi er Compensation Point.
(Pin 4/Pin 14): Feedback Pin. Receives the feedback
(Pin 1/Pin 11): Signal Input Supply. Decouple this
IN
U
. Connecting this pin to a voltage between 0V
U
(FE Package/UHF Package)
RUN/SS (Pin 7/Pin 1): Run Control and Soft-Start Input.
Forcing this pin below 0.5V shuts down the LTC3412A.
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 com-
ponents, 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 rated thermal
performance.
IN
(Pins 9, 16/Pins 3, 10): Power Input Supply. Decouple
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LTC3412A
IN
and C
OUT
.
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