Datasheet

LTM8026
11
8026fb
For more information www.linear.com/LTM8026
pin FuncTions
block DiagraM
RUN
0.2µF
SS
SYNC
V
REF
CTL_I
CTL_T
COMP
GND
RT ADJ
8026 BD
V
OUT
V
IN
INTERNAL
REGULATOR
R
SENSE
2.2µH
10k
2.2µF
V
IN
CURRENT
MODE
CONTROLLER
SS (Pin J8): The Soft-Start Pin. Place an external capacitor
to ground to limit the regulated current during start-up
conditions. The soft-start pin has an 11µA charging current.
ADJ (Pin K8): The LTM8026 regulates its ADJ pin to 1.19V.
Connect the adjust resistor from this pin to ground. The
value of R
ADJ
is given by the equation:
R
ADJ
=
11.9
V
OUT
– 1.19
where R
ADJ
is in kΩ.
RUN (Pin L6): The RUN pin acts as an enable pin and
turns on the internal circuitry. The RUN pin is internally
clamped, so it may be pulled up to a voltage source that is
higher than the absolute maximum voltage of 6V through a
resistor, provided the pin current does not exceed 100µA.
Do not leave this pin open. It may also be used to imple-
ment a precision UVLO. See the Applications Information
section for details.
SYNC (Pin L7): Frequency Synchronization Pin. This pin
allows the switching frequency to be synchronized to an
external clock. The R
T
resistor should be chosen to oper-
ate the internal clock at 20% lower than the SYNC pulse
frequency. This pin should be grounded when not in use.
Do not leave this pin floating. When laying out the board,
avoid noise coupling to or from the SYNC trace. See the
Synchronization section in Applications Information.