NCP398

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2

Figure 2. Simplified Block Diagram, WLCSP and UDFN Packages

Table 1. CSP PINOUT DESCRIPTION

Pin

Pin Name

Type

Description

A1

OUT

OUTPUT

Output voltage pin.

The OUT pin must be connected to the circuitry that is to be protected (VCONN rail).

B1

EN

I/O

Enable pin bar.

The device enters in shutdown mode when this pin is tied high in which case the output is disconnected

from the input.

A2

IN

POWER

Input voltage pin.

The IN pin must be connected to the input power supply (VBUS).

B2

GND

POWER

Ground.

Must be connected to the system GND plane.

Table 2. DFN PINOUT DESCRIPTION

Pin

Pin Name

Type

Description

1,2

IN

POWER

Input voltage pins.

The two IN pins must be hardwired together and are connected to the input power supply (VBUS).

3

GND

POWER

Ground.

Must be connected to the system GND plane.

5,6

OUT

POWER

Output voltage pins.

The two OUT pins must be hardwired together and are connected to the circuitry that is to be protected

(VCONN rail).

4

EN

I/O

Enable pin bar.

The device enters in shutdown mode when this pin is tied high in which case the output is disconnected

from the input.

7

PAD

POWER

DFN package back side pad. Must be connected to ground plane for thermal dissipation optimization.