US90A / US91A
24V Hall IC Fan Driver
Table of Contents
1 Functional Diagram ........................................................................................................ 1
2 General Description........................................................................................................ 1
3 Glossary of Terms .......................................................................................................... 3
4 Absolute Maximum Ratings........................................................................................... 3
5 Pin Definitions and Descriptions................................................................................... 3
6 General Electrical Specifications .................................................................................. 4
7 Magnetic Specifications................................................................................................. 4
8 Driver Output vs Magnetic Pole..................................................................................... 4
9 Detailed General Description......................................................................................... 5
10 Unique Features............................................................................................................ 5
11 Performance Graphs .................................................................................................... 6
11.1 RDSON vs TJ...................................................................................................................................................................... 6
11.2 RDSON vs VDD.................................................................................................................................................................. 6
11.3 Magnetic parameters vs TJ .................................................................................................................................. 6
11.4 Magnetic parameters vs VDD............................................................................................................................... 6
11.5 IDD vs TJ............................................................................................................................................................................. 6
11.6 IDD vs VDD ......................................................................................................................................................................... 6
11.7 VOL vs TJ ........................................................................................................................................................................... 7
11.8 Power Dissipation vs. TA ....................................................................................................................................... 7
12 Application Information................................................................................................ 7
12.1 Typical application with pull-up resistor..................................................................... 7
12.2 Configuration for reverse voltage / ground hot-switch protection and enhanced ESD
module protection ............................................................................................................. 7
13 Application Comments................................................................................................. 7
14 Standard information regarding manufacturability of Melexis products with
different soldering processes........................................................................................... 8
15 ESD Precautions........................................................................................................... 8
16 Package Information..................................................................................................... 9
16.1 VK Package Information (4-pin TO92)......................................................................................................... 9
16.2 DC Package Information (8-pin narrow SOIC)..................................................................................... 10
16.3 VA Package Information (4-pin TO92 flat).............................................................................................. 11
17 Disclaimer.................................................................................................................... 12
390109026302
Rev 002
Page 2 of 12
Data Sheet
Apr/07
MELEXIS [ Melexis Microelectronic Systems ]
