DC Brushless Motor Drivers for Cooling Fans Three-Phase Full-Wave Fan Motor Driver for Note PC No.12010EAT18 BH6717NUV Description BH6717NUV is a three-phase sensorless fan motor driver used to cool off notebook PCs. It is controlled by a variable speed provided through the PWM input signal. Its feature is sensorless drive which doesnt require a hall device as a location detection sensor and motor downsizing can be achieved by limiting the number of external components as much as possible. Furthermore, introducing a direct PWM soft switched driving mechanism achieves silent operations and low vibrations. Features 1) Speed controllable by PWM input signal 2) Sensorless drive 3) Soft switched drive 4) Power save function Applications small fan motor notebook PCs etc Absolute maximum ratings(Ta=25C) Parameter Symbol Ratings Unit Supply voltage VCC 0.36.5 V Power dissipation Pd 560 * mW Operating temperature Topr -25+95 C Storage temperature Tstg -55+125 C Output current Iomax 700 ** mA FG signal output voltage VFG 6.5 V FG signal output current IFG 6 mA Junction temperature Tjmax 125 C * Reduce by 5.6mW/ C over 25/ C. (On 70mm70mm1.6mm glass epoxy board) ** This value is not to exceed Pd. Operating conditions Parameter Symbol Ratings Unit Operating supply voltage range VCC 1.8 5.5 V *These specifications might change for their improvement etc. www.rohm.com 2012.03 - Rev.A 1/10 2012 ROHM Co., Ltd. All rights reserved. Technical Note BH6717NUV Electrical characteristics(Unless otherwise specified VCC=5V, Ta=25C) Limits Parameter Symbol Unit Conditions Min. Typ. Max. Circuit current STB A ICST - 20 50 Circuit current ICC 4 mA PWM input H level VPH 2.5 - VCC V PWM input L level VPL 0 - 0.7 V PWM input current H IPH - 0 1 A PWM=VCC PWM input current L A IPL -50 -20 - PWM=GND Input frequency FP 20 - 50 kHz FR input H level VFRH 4.5 - VCC V FR=H : Reverse drive FR input L level VFRL 0 - 0.5 V FR=L : Forward drive PWM off time s TPO 500 1000 2000 Limit voltage VLM 0.2 0.25 0.3 V Output voltage VO - 0.25 0.325 V Io250mA (H.L. total) FG low voltage IFG5mA VFGL - - 0.4 V Lock protection det.time LDT - 0.5 - s Lock protection rel.time LRT 2.5 5 10 s Lock protection ratio RLT - 10 - - rel.time/det.time ratio P ackage outlines (Unitmm) Package : VSON010V3030 www.rohm.com 2012.03 - Rev.A 2/10 2012 ROHM Co., Ltd. All rights reserved.