Linear Fan Driver


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The RT9027A/B is a high performance positive voltage regulator designed for very low dropout voltage up to 0.5 Amps. The VSET voltage must be larger than 1V to guarantee that VOUT is 1.6 times of VSET. When VSET is less than 1V, the IC will be shutdown. The FON pin turns VOUT to fully-on when FON is given low. For RT9027B (EN version), FON pin is equivalent to EN pin. The RT9027A/B provides excellent regulation over variations in line, load and temperature. The RT9027A/B is available in the SOP-8 package.


  • Notebook Computer Fan Driver
  • Battery Powered System
  • Motherboard
  • Peripheral Card

  • Notebooks
Key Spec.
RT9027A RT9027B
Status Active Active
Vin (min) (V) 4.5 4.5
Vin (max) (V) 5.5 5.5
Vout (min) (V) 1.6 1.6
Vout (max) (V) 5 5
Output Adj. Method Ext Vref Ext Vref
Accuracy (+/- %) 3 3
Iout (max) (mA) 500 500
Iq (typ) (uA) 300 300
Vdropout @ rated current (typ) (mV) 150 @ 0.5A 150 @ 0.5A
Cout Type Ceramic Ceramic
Features Enable Input;OCP;SCP;Stable with Ceramic Capacitor Enable Input;OCP;SCP;Stable with Ceramic Capacitor
Package Type SOP-8 SOP-8
  • VOUT Follows 1.6 Times of VSET

  • 150mV Dropout @ 0.5A
  • Over Current and Over Temperature Protection
  • FON Pin Turns VOUT Fully On
  • RoHS Compliant and 100% Lead (Pb)-Free

TitleLast UpdateShareDownload
Linear Fan Driver2007/07/19
Title Last Update ShareDownload
Linear Fan Driver 2015/05/19