NCP436, NCP437

http://onsemi.com

5

TIMINGS

Figure 3. Enable, Rise and Fall Time

EN

FUNCTIONAL DESCRIPTION

Overview

The NCP437 is a high side P channel MOSFET power

distribution switch designed to isolate ICs connected on the

battery in order to save energy. The part can be turned on,

with a wide range of battery from 1.0 V to 3.6 V.

Enable Input

Enable pin is an active high. The path is opened when EN

pin is tied low (disable), forcing P MOS switch off.

1.2 V and EN forced to high level.

Auto Discharge

NMOS FET is placed between the output pin and GND,

in order to discharge the application capacitor connected on

OUT pin.

The auto−discharge is activated when EN pin is set to low

level (disable state).

The discharge path (Pull down NMOS) stays activated as

In order to limit the current across the internal discharge

N−MOSFET, the typical value is set at 65

W.

IN and OUT, 1

mF, at least, capacitors must be placed as

close as possible the part to for stability improvement.