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US91A

Features: · Low cost· High sensitivity Hall Sensor· Locked rotor protection and auto-restart· Power-efficient CMOS and power MOSFETs· Built-in output protection clamping diode· Integrated tachometer (US90A) or alarm (US91A) signal output· 2-coil fan driver with FG/RD output in 4-pin VK / VA and 8-...

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SeekIC No. : 004538737 Detail

US91A: Features: · Low cost· High sensitivity Hall Sensor· Locked rotor protection and auto-restart· Power-efficient CMOS and power MOSFETs· Built-in output protection clamping diode· Integrated tachometer...

US91A Data Sheet

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Part Number:
US91A
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/22

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Product Details

Description



Features:

· Low cost
· High sensitivity Hall Sensor
· Locked rotor protection and auto-restart
· Power-efficient CMOS and power MOSFETs
· Built-in output protection clamping diode
· Integrated tachometer (US90A) or alarm (US91A) signal output
· 2-coil fan driver with FG/RD output in 4-pin VK / VA and 8-pin narrow SOIC packages (all RoHS Compliant


Application

·12V/24V fans
· Peak current up to 500mA


Specifications

Parameter Symbol Value Units
Fan Supply Voltage VDD 30 V
Peak Output Current IOUTp 500 mA
Continuous Output Current IOUTc 250 mA
FG / RD Output Current IFG(RD) 20 mA
Operating Temperature Range TA -40 to 85
Junction Temperature TJ 125
Storage Temperature Range TS -55 to 150
Magnetic Flux Density B Unlimited mT

Table 1: Absolute maximum ratings
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximumrated
conditions for extended periods may affect device reliability.


Description

The US91A is a one-chip solution for driving  two-coil brushless DC cooling fans.

Based on the advanced Melexis CMOS process, the IC US91A contains a Hall-effect sensor, dynamic offset correction and low side output drivers.

Frequency Generator or Rotation Detection is available. The open-drain output ofg US91A makes the connectivity with any external interface such as hardware monitoring or Super I/O IC easier.

These features of US91A are combined with the Melexis patented no-VDD design to fit the IC in small 4-pin VK and VA package.

The US91A is also delivered in DC package for automatic assembly.




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