Figure 2. Pin description, top view.
VIN (Pin 1,2): Input voltage pin. Supplies power
to the IC. VIN can range from 2.4V to 5.5V.
Input GND: (Pin 3): Input power ground.
Connect this pin to the ground terminal of the
Recommendations for further details.
Output GND: (Pin 4): Power ground. The
output filter capacitor should be connected to
this pin. Refer to Layout recommendations for
VOUT (Pin 5,6,7): Regulated output voltage.
NC (Pin 8,9,10,11,12,13,14): These pins
should not be electrically connected to each
other or to any external signal, voltage, or
ground. One or more of these pins may be
VSENSE (Pin 15): Sense pin for output voltage
regulation. Connect VSENSE to the output
voltage rail as close to the terminal of the
output filter capacitor as possible.
Figure 3. Pin description, bottom view.
VFB (Pin 16): Feed back pin for external divider
option. When using the external divider option
(VS0=VS1=VS2= high) connect this pin to the
center of the external divider. Set the divider
such that VFB = 0.603V.
VS0,VS1,VS2 (Pin 17,18,19): Output voltage
select. VS0=pin19, VS1=pin18, VS2=pin17.
Selects one of seven preset output voltages or
choose external divider by connecting pins to
logic high or low. Logic low is defined as VLOW
≤ 0.4V. Logic high is defined as VHIGH ≥ 1.4V.
Any level between these two values is
indeterminate. (refer to section on output
voltage select for more detail).
ENABLE (Pin 20): Output enable. Enable =
logic high, disable = logic low. Logic low is
defined as VLOW ≤ 0.2V. Logic high is defined
as VHIGH ≥ 1.4V. Any level between these two
values is indeterminate.
Thermal Pad. Thermal pad to remove heat
from package. Connect to surface ground pad
and PCB internal ground plane.
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