MCP1602 datasheet(11/26 Pages) MICROCHIP

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DS22061A-page 11

MCP1602

3.0

PIN DESCRIPTIONS

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

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Shutdown Control Input Pin

(SHDN)

The SHDN pin is a logic-level input used to enable or

disable the device. A logic high (>45% of VIN) will

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

will ensure that the regulator is disabled.

3.2

Analog Input Supply Voltage Pin

(VCC)

The VCC pin provides bias for internal analog functions.

This voltage is derived by filtering the VIN supply.

3.3

Power-Good Output Pin (PG)

PG is an output level indicating that the output voltage

is within 94% of regulation. The PG output is configured

as an open-drain output.

3.4

Analog Ground Pin (AGND)

AGND is the analog ground connection. Tie AGND to the

analog portion of the ground plane (AGND). See the

physical layout information in the

Section 5.8 “PCB

Layout Information” section for ground recommenda-

tions.

3.5

Output Voltage Sense Pin (VFB/

VOUT)

For the adjustable output voltage options, connect the

center of the output voltage divider to the VFB pin. For

fixed-output voltage options, connect the output of the

buck regulator to this pin (VOUT).

3.6

Power Supply Input Voltage Pin

(VIN)

VIN is the buck regulator power input supply pin.

Connect a variable input voltage source to VIN.

3.7

Buck Inductor Output Pin (LX)

Connect LX directly to the buck inductor. This pin

carries large signal-level current; all connections

should be made as short as possible.

3.8

Power Ground Pin (PGND)

Connect all large signal level ground returns to PGND.

These large signal level ground traces should have a

small loop area and length to prevent coupling of

switching noise to sensitive traces.

3.9

Exposed Metal Pad (EP)

For the DFN package, connect the Exposed Pad to

AGND, with vias into the AGND plane. This connection to

the AGND plane will aid in heat removal from the

package.

MSOP

DFN

Sym

Description

SHDN

Shutdown Input Pin

VCC

Analog Input Supply Voltage Pin

Power Good Output Pin

AGND

Analog Ground Pin

VFB/VOUT

Feedback Voltage (Adjustable Version) / Output Voltage (Fixed Version) Pin

VIN

Input Supply Voltage Pin

Buck Inductor Output Pin

PGND

Power Ground Pin

—

Exposed

Pad

For the DFN package, the center exposed pad is a thermal path to remove

heat from the device. Electrically this pad is at ground potential and should

be connected to AGND

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