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US72/73
Single Coil Fan Driver
3901090261
Page 1 of 9
Data Sheet
Rev. 002
May/04
Features and Benefits
Full Bridge Driver
High Sensitivity Hall Sensor
Locked Rotor Shutdown and Auto-Restart
Power-Efficient CMOS and Power MOSFETs
Integrated tachometer (US72) or alarm (US73) signal outputs
Applications
For 12V/24V Fans
Ordering Information
Part No.
Temperature Suffix
Package Code
US72
E (-40°C to 85°C)
DC (8-Pin narrow SOIC)
US73
E (-40°C to 85°C)
DC (8-Pin narrow SOIC)
Functional Diagram
Locked-Rotor
Protection
N1
P2
N2
Hall
Amp.
Gate Drive
P1
Gate Drive
6
3
Regulator
4
Switching
Logic
Clamp
1
Out1
Out2
8
5
2
7
FG/RD
Vdd
Gnd
Description
The US72 and US73 provide a monolithic
solution for driving single-coil fans. The bridge
drivers provide bi-directional current through the
single phase motor winding.
US72: The tachometer/Frequency Generator
(FG) version produces a logic signal, which is
aligned with the Hall plate signal.
US73: The Rotation Detector (RD) / Alarm
Signal version has a low output in the normal
condition. When a locked rotor condition occurs
the RD changes to a high state.
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