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NCT3940S-A Datasheet(PDF) 3 Page - Nuvoton Technology Corporation |
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NCT3940S-A Datasheet(HTML) 3 Page - Nuvoton Technology Corporation |
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3 / 14 page NCT3940S/NCT3940S-A Publication Date: Mar., 2011 -1- Revision A3 1. GENERAL DESCRIPTION The NCT3940S/ NCT3940S-A is a simply linear fan driver. It is designed for noise- sensitive or power-sensitive applications that require system cooling. The NCT3940S/ NCT3940S-A is a low quiescent current, low dropout linear regulator which is designed with a P-channel MOSFET to power a DC fan and delivers output current up to 500mA. The output voltage follows the 1.6 times on the voltage of VSET pin to dynamic adjust the DC fan speed. NCT3940S supports enable pin to control the output voltage. NCT3940S-A is power-on by the VSET pin voltage threshold and supports fully turn-on function. The internal power MOSFET can be fully turned on directly when FON# is at low level. NCT3940S/ NCT3940S-A is available in SOP-8 package. 2. FEATURES 2.1. General VOUT Follows 1.6 Times of VSET 150mV Dropout @ 0.5A Output Current 5uA Quiescent Current is Shutdown Mode UVLO Function Full On Function Over Current, Short Circuit and Over Temperature Protections Low External Component Count Low Cost and Easy to Use 2.2. Package SOP-8 150mil with Exposed Pad Package Lead Free (ROHS Compliant) and Halogen Free 2.3. Application Notebook/ Netbook Fan Driver Peripheral Add-in Cards Motherboards Battery Powered Systems |
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