The descriptions of the pins are listed in
PIN FUNCTION TABLE
Switch Node Pin (SW)
Connect the inductor from the input voltage to the SW
pin. The SW pin carries inductor current and can be as
high as 800 mA peak. The integrated N-Channel switch
drain and integrated P-Channel switch source are inter-
nally connected at the SW node.
Ground Pin (GND)
The ground or return pin is used for circuit ground con-
nection. Length of trace from input cap return, output
cap return, and GND pin should be made as short as
possible to minimize noise on the GND pin. In the
SOT23-6 package, a single ground pin is used.
Enable Pin (EN)
The EN pin is a logic-level input used to enable or
disable device switching, and lower quiescent current
while disabled. A logic high (>90% of V
the regulator output. A logic low (<20% of V
ensure that the regulator is disabled.
Feedback Voltage Pin (FB)
The FB pin is used to provide output voltage regulation
by using a resistor divider. The FB voltage will be 1.21V
typical with the output voltage in regulation.
Output Voltage Pin (V
The output voltage pin connects the integrated
P-Channel MOSFET to the output capacitor. The FB
voltage divider is also connected to the V
2011 Microchip Technology Inc.
Switch Node, Boost Inductor Input Pin
Enable Control Input Pin
Feedback Voltage Pin
Output Voltage Pin
Input Voltage Pin
Signal Ground Pin
Power Ground Pin
Output Voltage Sense Pin
Output Voltage Power Pin
Exposed Thermal Pad (EP); must be connected to V
Power Supply Input Voltage Pin
Connect the input voltage source to V
source should be decoupled to GND with a 4.7 µF
Signal Ground Pin (S
The signal ground pin is used as a return for the
package, the S
Power Ground Pin (P
The power ground pin is used as a return for the high-
current N-Channel switch. In the 2x3 DFN package, the
Output Voltage Sense Pin (V
The output voltage sense pin connects the regulated
) will enable
output voltage to the internal bias circuits. In the 2x3
DFN package, the V
) pins are connected externally.
Output Voltage Power Pin (V
The output voltage power pin connects the output volt-
age to the switch node. High current flows through the
integrated P-Channel and out of this pin to the output
capacitor and output. In the 2x3 DFN package, V
are connected externally.
Exposed Thermal Pad (EP)
There is no internal electrical connection between the
Exposed Thermal Pad (EP) and the S
pins. They must be connected to the same potential on
the Printed Circuit Board (PCB).
. The input
and error amplifier. In the 2x3 DFN
and power ground (P
) pins are
pins are connected externally.
and output voltage power