■ General Description

The LN4913 is an integrated hall-effect sensor designed

specifically to meet the requirements of low-power devices.

e.g. as an On/Off switch in Cellular Flip-Phones, with

battery operating voltages of 1.65V-5.5V.

Precise magnetic switching points and high temperature

stability are achieved through the unique design of the

internal circuit. An onboard clock scheme is used to reduce

the average operating current of the IC. During the operate

phase the IC compares the actual magnetic field detected

with the internally compensated switching points. The

output Voltage is switched at the end of each operating

phase. During the Stand-by phase the output stage is

latched and the current consumption of the device reduced

to some µA.

The IC switching behavior is Omni polar; it can be switched

on with either the North or South pole of a magnet.

■ Applications

 Cover switch in clam-shell cellular phones

 Cover switch in Notebook PC/PDA

 Contact-less switch in consumer products

■ Features

 Micro power design

 1.65 V to 5.5 V battery operation

 High sensitivity and high stability of the magnetic

switching points

 High resistance to mechanical stress

 Digital output signal

 Switching for both poles of a magnet (omnipolar)

 Not suitable for automotive application