Omnipolar on/off Hall-effect switch IC
MLX90248 Melexis
The micropower feature makes the MLX90248 suitable for battery-powered device as it combines low voltage operation and low current consumption. By using a sleep/awake strategy managed internally, the power consumption is drastically reduced.
Top features
-
Micropower consumption ideal for battery-powered applications: 5uA@3V; 3uA@1.5V
-
8kV ESD protection
-
Omnipolar, easy to use as output switches with North and South pole active
-
Very high sensitivity: 6 mT max (60 Gauss)
-
Operation down to 1.5 V
-
Operating voltage from 1.5 V to 3.6 V
-
Open-drain output
-
Lead-free and halogen-free (RoHS compliant) packaging
- Thin SOT23 3L and ultra-thin QFN package (both RoHS compliant)
Omnipolar on/off Hall-effect switch IC - MLX90248
Product description
The MLX90248 is most commonly found in mobile phone applications for detecting the open/close action of the lid (flip, slide and swivel type phones) and also to detect the (un)holstered condition of brick and smartphones. The goal of this detection is to switch on or off the power hungry displays, backlights and keypad illumination whenever the lid is opened or closed. Thereby maximizing battery life between charges.
The same operation principle can be simply applied to many other battery-powered devices like laptops, digital cameras and camcorders, music players and handheld gaming devices.
This very high sensitivity Hall sensor IC allows the use of only a very small and cheap magnet to trigger the MLX90248, hence it can easily replace a reed switch.
Several benefits derive from using a Hall sensor IC. One is to provide solid state switching, which is bounce-free, more reliable and with increased lifetime compared to usual mechanical contacts. The other is seamless pick and place manufacturing as the device is available in standard, lead-free and green surface mount technology.
The MLX90248 exhibits omnipolar magnetic characteristics. This means that the device reacts to both North and South magnetic pole. The purpose is to detect the presence of any magnetic field applied on the device. This mode of operation simplifies customer production processes when orienting the magnet during assembly.
The micropower feature makes the MLX90248 especially suitable for battery-powered devices as it combines low voltage operation and low current consumption. By using a sleep/awake strategy managed internally, the power consumption is drastically reduced. To make a comparison, the MLX90248 consumes 100 times less power than the generic low voltage US3881.
As well as thin SOT package, the MLX90248 is now delivered in an ultra thin UTQFN package. This new leadless package only requires 3mm^2 PCB surface and is 0.43 mm maximum thick, which is particularly important in designs where space-saving and miniaturization are the critical factors.
Read more about the Hall-effect principle.
Features and benefits
-
Micropower consumption ideal for battery-powered applications: 5uA@3V; 3uA@1.5V
-
8kV ESD protection
-
Omnipolar, easy to use as output switches with North and South pole active
-
Very high sensitivity: 6 mT max (60 Gauss)
-
Operation down to 1.5 V
-
Operating voltage from 1.5 V to 3.6 V
-
Open-drain output
-
Lead-free and halogen-free (RoHS compliant) packaging
- Thin SOT23 3L and ultra-thin QFN package (both RoHS compliant)
Documents and tools
Datasheet(s)
Product flyer(s)
Selection guide(s)
Related tech talks
Videos
Magnetic Latch Switch: Experience matters
25+ years in Latch & Switch has given Melexis a unique view of market needs. Decisions taken in 1993 to focus on CMOS technology and TSOT packaging are just as valid today as they were then.
Step-by-step guide to Latch & Switch portfolio
During this video, Thomas Strauven, Applications Engineer for Latch & Switch, guides you through the Melexis selection guide for the Latch & Switch portfolio. This selection guide is a parametric document that allows you to find and compare the specifications and features of our extensive Latch & Switch portfolio.
