Linear Fan Driver

RT9027A/RT9027B

The RT9027A/B is a high performance positive voltage regulator designed for very low dropout voltage up to 0.5 Amps. The V_SET voltage must be larger than 1V to guarantee that V_OUT is 1.6 times of V_SET. When V_SET is less than 1V, the IC will be shutdown. The FON pin turns V_OUT 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.

Applications

Notebook Computer Fan Driver
Battery Powered System
Motherboard
Peripheral Card

Key Spec.

	RT9027A	RT9027B
Status	EOL	EOL
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;Output Discharge;SCP;Stable with Ceramic Capacitor	Enable Input;OCP;Output Discharge;SCP;Stable with Ceramic Capacitor
Package Type	SOP-8	SOP-8

Features

V_OUT Follows 1.6 Times of V_SET
150mV Dropout @ 0.5A
Over Current and Over Temperature Protection
FON Pin Turns V_OUT Fully On
RoHS Compliant and 100% Lead (Pb)-Free

Datasheet

DS9027AB-02.pdf

Datasheet

DS9027AB-02.pdf