Datasheet DC Brushless Fan Motor Drivers Multifunction Single-phase Full-wave Fan Motor Driver BD6973FV General description Package W (Typ.) x D (Typ.) x H (Max.) BD6973FV is a pre-driver that controls the motor drive SSOP-B16 5.00mm x 6.40mm x 1.35mm part composed of the power transistors. Moreover, a lot of functions are installed, and the pin is compatible with BD6974FV(lock alarm signal output). Features Pre-driver for external power transistors Speed controllable by DC / direct PWM input PWM soft switching Soft start Quick start Current limit Lock protection and automatic restart SSOP-B16 Rotation speed pulse signal (FG) output Application Fan motors for general consumer equipment of desktop PC, and Server, etc. Absolute maximum ratings Parameter Symbol Limit Unit Supply voltage Vcc 20 V *1 Power dissipation Pd 874.7 mW Operating temperature range Topr 40 to +100 C Storage temperature range Tstg 55 to +150 C High side output voltage Voh 36 V Low side output voltage Vol 15 V Low side output current Iol 10 mA Rotation speed pulse signal (FG) output voltage Vfg 20 V Rotation speed pulse signal (FG) output current Ifg 10 mA Reference voltage (REF) output current Iref 12 mA Hall bias (HB) output current Ihb 12 mA Input voltage (H+, H, TH, MIN, CS) Vin 7 V Junction temperature Tj 150 C *1 Reduce by 7.0mW/C over Ta=25C. (On 70.0mm70.0mm1.6mm glass epoxy board) Recommended operating conditions Parameter Symbol Limit Unit Operating supply voltage range Vcc 4.3 to 17.0 V Operating input voltage range 1 (H+, H) 0 to 7 V (more than Vcc=9V) Vin1 Operating input voltage range 1 (H+, H) 0 to Vcc2 V (less than Vcc=9V) Operating input voltage range 2 (TH, MIN) Vin2 0 to Vref V Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays www .rohm.com TSZ02201-0H1H0B100190-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/13 TSZ2211114 001 28.JUL.2012 Rev.002DatasheetDatasheet BD6973FV Pin configuration Pin description P/No. T/Name Function (TOP VIEW) 1 FG Speed pulse signal output terminal Oscillating capacitor connecting FG 1 16 GND 2 OSC terminal 3 MIN Minimum output duty setting terminal OSC 2 15 H 4 TH Output duty controllable input terminal MIN 3 14 HB 5 REF Reference voltage output terminal 6 Vcc Power supply terminal TH 4 13 H+ 7 A1H High side output terminal 1 8 A1L Low side output terminal 1 REF 5 12 SS 9 A2L Low side output terminal 2 10 A2H High side output terminal 2 Vcc 6 11 CS 11 CS Output current detection terminal A1H 7 10 A2H Soft start capacitor connecting 12 SS terminal A1L 8 9 A2L 13 H+ Hall + input terminal 14 HB Hall bias terminal Fig.1 Pin configuration 15 H Hall input terminal 16 GND Ground terminal Block diagram FG SIGNAL PWM SOFT GND 1 TSD 16 OUTPUT SWITCHING HALL AMP OSC H 2 15 OSC HALL COMP PWM MIN HALL HB COMP 3 14 BIAS CONTROL PWM LOGIC COMP TH H+ LOCK 4 13 PROTECT QUICK Vcl START REF 5 12 SS REF Vcc SOFT START & CURRENT LIMIT COMP CS 6 11 Vcc PRE- DRIVER A1H A2H REG REG 7 10 A1L A2L 8 9 Fig.2 Block diagram I/O truth table Hall input Driver output H+ H A1H A1L A2H A2L FG H L Hi-Z H L L Hi-Z L H L L Hi-Z H L H High, L Low, Hi-Z High impedance FG output is open-drain type. www.rohm.com TSZ02201-0H1H0B100190-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/13 TSZ2211115 001 28.JUL.2012 Rev.002