US79(2004) View Datasheet(PDF) - Melexis Microelectronic Systems
Part Name
Description
Manufacturer
US79 Datasheet PDF : 9 Pages
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US79 Series
CMOS Power Hall IC
Features and Benefits
• Built-in Reverse Voltage Protection
• Built-in RFI Filter
• Power Efficient CMOS and Power MOSFET Drivers allow 400mA without
overheating
• Built-in Zener Diodes Protect Outputs
• Eliminate all Fan Components
• Eliminate PC Board
• 5V and 12V Operation
• High Sensitivity for switching symmetry
• Locked Rotor Shutdown
Applications
• Fan sizes up to 90mm
• Current range up to 400mA
Ordering Information
Part No.
US79
Temperature Suffix
K (-40°C to 125°C)
1. Functional Diagram
Package Code
UA (TO-92 flat)
2. Description
The US79KUA is the most advanced Smart Fan
Control Hall IC. It is designed for 5V and 12V
cooling commutation. The chip contains many
features to allow survival in a harsh
environment. The IC was designed to eliminate
all discrete components such as capacitors,
resistors, transistors, diodes, PC board and
associated labor, replacing US$0.25 to US$0.35
in direct cost.
The K rating guarantees proper operation up to
an ambient temperature of 125°C. Hall IC
circuitry and power FET output provide a low
power dissipation cool chip.
Locked Rotor conditions are detected by the IC
when there is no motion for one second and will
shut off the motor drive for five seconds. Then,
the IC will turn on the drive current for one
second. This sequence continues indefinitely
until the locked rotor condition is fixed. This
feature prevents overheating.
123
39010US79
Rev. 006
Page 1 of 9
DataSheet
Feb/04
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