Datasheet

LTC3615/LTC3615-1
10
3615fb
For more information www.linear.com/LTC3615
behavior for channel 1 is programmable with the TRACK/
SS1 pin:
1. Internal soft-start with a fixed timing can be programmed
by tying TRACK/SS1 to SV
IN
.
2. External soft-start can be programmed with the timing
set by a capacitor to ground and a resistor to SV
IN
.
3. Tracking the start-up behavior of another supply is
programmable (see the Applications Information
section).
4. The pin can be used as external reference input.
ITH1 (Pin 22/Pin 1): Error Amplifier Compensation. Con
-
nection for external compensation from ITH to SGND.
The current comparator’s threshold increases with this
control voltage. Tying this pin to SV
IN
enables AVP mode
with internal compensation.
V
FB1
(Pin 23/Pin 2): Voltage Feedback Input Pin for
Channel 1. Receives
the feedback voltage for channel 1
from the external resistive divider across the output.
MODE (Pin 24/Pin 3): Mode Selection.
pin FuncTions
(FE/UF)
1. Tying the MODE pin to SV
IN
or SGND enables pulse-
skipping mode or Burst Mode operation (with an internal
Burst Mode clamp), respectively.
2. If this pin is held at slightly higher than half of SV
IN
,
forced continuous mode will be selected.
3. Connecting this pin to an external voltage will select
Burst Mode operation
with the burst clamp set to the
pin voltage.
PGND (Exposed Pad Pin 25/ Exposed Pad Pin 25): Power
Ground. The exposed pad connects to the sources of the
power N-channel MOSFETs. The PGND pin is common
for both channels. The exposed pad must be soldered
to the PCB.
For electrical connection and rated thermal performance,
refer to the Operation and Applications Information sec
-
tions for more information.
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