MCP1612_13 datasheet(9/22 Pages) MICROCHIP

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DS21921C-page 9

MCP1612

3.0

MCP1612 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Input Voltage Pin (VIN)

Connect the input voltage source to VIN. For normal

operation, the voltage on VIN should be between +2.7V

and +5.5V. A 10 µF bypass capacitor should be

connected between VIN and PGND.

3.2

Analog Input Voltage Pin (VCC)

VCC provides bias for internal analog functions. This

voltage is derived by filtering the VIN supply.

3.3

Shutdown Input Pin (SHDN)

Connect SHDN to a logic-level input in order to turn the

regulator on or off. A logic-high (>45% of VIN) will

enable the regulator. A logic-low (<15% of VIN) will

force the regulator into Shutdown mode. When in

shutdown, both the P-channel and N-channel switches

are turned off.

3.4

Compensation Pin (COMP)

COMP is the internal transconductance amplifier

output pin. External compensation is connected to

COMP for control-loop stabilization.

3.5

Feedback Pin (FB)

Connect the output voltage of the buck converter

through an external resistor divider to FB to regulate

the output voltage. The nominal voltage compared to

this input for pulse termination is 0.8V.

3.6

Analog Ground Pin (AGND)

Tie all small-signal ground returns to AGND. Noise on

AGND can effect the sensitive internal analog

measurements.

3.7

Power Ground Pin (PGND)

Connect all large-signal ground returns to PGND. These

large-signal traces should have a small loop area and

length to prevent coupling of switching noise to

sensitive traces.

3.8

Buck Inductor Output Pin (LX)

Connect LX directly to the buck inductor. This pin

carries large signal-level currents; all connections

should be made as short as possible.

Pin No.

Name

Function

1VIN

Input Voltage Pin

2VCC

Analog Input Voltage Pin

SHDN

Shutdown Control Input Pin

COMP

Transconductance Amplifier Output Pin

Feedback Input Pin

6AGND

Analog Ground Pin

7PGND

Power Ground Pin

8LX

Buck Inductor Output Pin

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