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31151

40V, 2A Synchronous Buck-Boost DC/DC Converter

Linear Technology 

LTC3115-1

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 VCC 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.

For more information www.linear.com/LTC3115-1

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