Ordering number : ENA2264 LA6581DM Monolithic Linear IC Fan Motor Driver http://onsemi.com BLT Driver Single-Phase Full-Wave Overview The LA6581DM is a low-saturation BTL output linear driving motor driver for single-phase bipolar fan motors. It features quite, low power, high efficiency drive that suppresses reactive current. It is optimal for use in applications that require miniaturization and low noise, such as CPU cooling fan motors and 5 to 12V electronic game products. Micro8 Functions • Single-phase full-wave linear drive with BTL output (gain resistance 500Ω to 284kΩ, 55dB) : Suitable for the equipment requiring silent operation, such as game equipment, CPU cooler, etc. because of its freedom from switching noise. • Low-voltage operation possible, with wide operable voltage range (2.2 to 16V) • Low saturation output (Upper + lower saturation voltage : VOsat (total) = 0.3V typ, IO = 100mA) : High coil efficiency with low current drain. IC itself does not generate much heat. • High impedance of Hall input pin • FG output (rotation speed detection output : open collector output) • Heat protection circuit : When the large current flows because of output short-circuit, raising the IC chip temperature above 180°C, the heat protection circuit suppresses the drive current, preventing IC burn and breakdown. • Extra-small package (Micro8) Small substrate while allowing larger blades Specifications Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Output voltage VCC max 18 V Allowable power dissipation Pd max Output current IOUT1 max Mounted on a specified board *1 400 mW *2 0.36 IOUT2 max T<200ms 0.50 A A V Output withstand voltage VOUT max 18 FG output withstand VFG max 18 V FG output current IFG max 5 mA Operating temperature Topr -30 to +100 °C Storage temperature Tstg -55 to +150 °C *1: Mounted on a board (20.0mm 10.0mm 0.8mm: Paper Phenol, wiring density 20%) *2: This specifies the starting current. Tj=15°C max must not be exceeded.. Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time. Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current, high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. ORDERING INFORMATION See detailed ordering and shipping information on page 5 of this data sheet. Semiconductor Components Industries, LLC, 2014 January, 2014 10814NK 20131203-S00001 No.A2264-1/5 LA6581DM Recommended Operating Conditions at Ta = 25°C Parameter Symbol Supply voltage VCC Common-phase input voltage range of VICM Conditions Ratings Unit 2.2 to 16 V 0.3 to VCC-1.5 V Hall input Electrical Characteristics at Ta = 25°C, VCC = 12.0V, unless especially specified. Ratings Parameter Symbol Conditions Unit min Typ Max Circuit Current ICC IN- = 5.8V, IN+ = 6.0V, RL = ∞ 14 19 mA OUT output low voltage VOL IO = 100mA 0.1 0.2 V OUT output high voltage VOH IO = 100mA 0.1 0.2 V Hall bias voltage VHB RH = 360Ω +91Ω 1.85 1.95 2.05 V Hall amplifier gain Vg 52 55 58 dB Hall amplifier input current VINR FG output low voltage VFG IFG = 3mA FG output leakage current IFGL VFG = 7V Thermal protection circuit Th * Design guarantee -10 150 -2 +10 μA 0.2 0.3 V 30 μA 180 200 °C *: These values are design guarantee values, and are not tested. Truth Table IN- IN+ OUT1 H L H L L L H L H Off - - Off Off - OUT2 FG mode During rotation During overheat protection Pd-Ta 500 Pd max -- Ta 400 With specified board 300 200 160 100 0 90 120 No.A2264-2/5 LA6581DM Package Dimensions unit : mm (typ) Micro8 CASE 846A-02 ISSUE J Pin Assignment Micro8 IN+ 1 8 FG HB 2 7 VCC 6 OUT2 3 OUT1 4 5 GND Top view No.A2264-3/5 LA6581DM Block Diagram VCC FG 2.0VRG HB IN+ H OUT1 OUT2 IN- GND Timing Chart Hall Signal OUTPUT Coil Current FG Pulse No.A2264-4/5 LA6581DM Application Circuit Example Di Cr *4 VCC *1 R2 LA6581DM *2 HB FG HB H *3 H OUT1 IN+ IN+ OUT2 *5 R2 R1 GND Elements in substrate *1 : When Di to prevent breakdown in case of reverse connection is used, it is necessary to insert a capacitor Cr to secure the regenerative current route. Similarly, Cr is necessary to enhance the reliability when there is no capacitor near the fan power line. *2 : To obtain Hall bias from VCC, carry out 1/2 × VCC bias as shown in the figure. Linear driving is made through voltage control of the coil by amplifying the Hall output. When the Hall element output is large, the startup performance and efficiency are improved. Adjustment of the Hall element can reduce the noise further. *3 : When the Hall bias is taken from the HB pin, constant-voltage bias is made with about 2.0V. Therefore, the Hall element can provide the output satisfactory in temperature characteristics. Adjustment of the Hall output amplitude is made with R1. (When VCC = 12V, the step *2 above proves advantageous for IC heat generation.) *4 : Keep this open when not used. *5 : When the wiring from the Hall output to IC Hall input is long, noise may be carried through the wiring. In this case, insert the capacitor as shown in the figure. ORDERING INFORMATION Device LA6581DMR2G Package Micro8 (Pb-Free / Halogen Free) Shipping (Qty / Packing) 4000 / Tape & Reel ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. 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This literature is subject to all applicable copyright laws and is not for resale in any manner. PS No.A2264-5/5