Datasheet

LTC3115-1
11
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pin FuncTions
(DHD/FE)
PWM/SYNC (Pin 16/Pin 19): Burst Mode/PWM Mode
Control Pin and Synchronization Input. Forcing this pin
high causes the IC to operate in fixed frequency PWM mode
at all loads using the internal oscillator at the frequency
set by the RT Pin. Forcing this pin low places the IC into
Burst Mode operation for improved efficiency at light load
and reduced standby current. If an external clock signal
is connected to this pin, the buck-boost converter will
synchronize its switching with the external clock using
fixed frequency PWM mode operation. The pulse width
(negative or positive) of the applied clock should be at
least 100ns. The maximum operating voltage for the
PWM/SYNC pin is 5.5V. The PWM/SYNC pin can be con-
nected to V
CC
to force it high continuously.
PGND (Exposed Pad Pin 17/Pins 1, 10, 11, 20, Exposed
Pad Pin 21): Power Ground Connections. These pins
should be connected to the power ground in the applica
-
tion. The exposed pad is the power ground connection. It
must be soldered to the PCB and electrically connected
to ground through the shortest and lowest impedance
connection possible and to the PCB ground plane for
rated thermal performance.
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