AH2985 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Description Pin Assignments NEW PRODUCT The AH2985 is a single-chip solution for driving two-coil brushless direct current (BLDC) fans and motors. The device includes a Halleffect sensor, dynamic offset correction and two complementary open-drain output drivers with internal Zener diode protection. It is optimized for low start-up voltage. (Top View) AH2985 1 : VDD To help protect the motor coils, the AH2985 provides Rotor Lock Protection which shuts down output drives if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. Over temperature shutdown provides thermal protection for the device. 2 : DO 3 : DOB 4 : GND The AH2985 is available in TO94 package. 1 2 Single-Chip Solution Operating Voltage: 2.5V to 15V Built-in Hall Sensor and Input Amplifier Rotor Lock Protection (Lock Detection, Output Shutdown and Automatic re-Start) Built-in Reverse Voltage Protection Diode Built-in Zener Protection for Output Drivers Average Output Current up to 500mA Package: TO94 “Green” Molding Compound Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Notes: 4 TO94 Features 3 Applications Two-Coil BLDC Cooling Fans Low Voltage/ Low Power BLDC Motors 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. Typical Applications Circuit (Note 4) 12V D2 VDD AH2985 L1 VDD 1 L2 DO DOB GND 2 3 4 GND D1 C 12V Brushless DC Fan Note: 4. D1 (Zener Diode) and Capacitor C are for power stabilization. Recommended value of C is 1μF/ 50V (E-Cap). Diode D2 is optional and helps to protect the device and fan coils from reverse power conditions. The AH2985 also includes an internal reverse blocking diode at VDD pin. AH2985 Document number: DS38175 Rev. 1 - 2 1 of 8 www.diodes.com September 2015 © Diodes Incorporated AH2985 NEW PRODUCT Pin Descriptions Pin Number Pin Name Function 1 VDD Input Power 2 DO Output Pin 3 DOB Output Pin 4 GND Ground Functional Block Diagram VDD 1 Lock Detect, Shutdown and Automatic Re-start 2 Regulator Hall Plate Control Logic Amp. 3 DO DOB 4 GND AH2985 Document number: DS38175 Rev. 1 - 2 2 of 8 www.diodes.com September 2015 © Diodes Incorporated AH2985 Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 5) Symbol Parameter Rating Unit VDD Supply Voltage 18 V VRDD Reverse VDD Polarity Voltage -15 V IO(AVE) 500 Output Current (Note 6) mA IO(peak as hold) NEW PRODUCT PD TSTG Notes: 800 Power Dissipation Storage Temperature 550 mW -55 to +150 C TJ Maximum Junction Temperature +150 C JA Thermal Resistance 227 C/W JC Thermal Resistance 49 C/W 5. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. 6. Shall not exceed PD and Safety Operation Area. Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Condition Min Max Unit Supply Voltage Operating 2.5 15 V Operating Ambient Temperature (Note 6) Operating -40 +105 C Symbol VDD TA Parameter Electrical Characteristics (@TA = +25°C, VDD = 12V, unless otherwise specified.) Symbol Condition Min Typ Max Unit IDD Supply Current Operating, VDD = 12V – 1 5 mA tON Locked Protection On Time – – 0.45 – s tOFF Locked Protection Off Time – – 2.7 – s Locked Protection Duty Ratio tOFF/ tON – 6 – – IO= 300mA – 1 1.6 IO= 500mA – 1 1.8 (Note 7) 20 28 36 RDUTY RDS(ON) VZ Note: Parameter Output On Resistance Output Zener-Breakdown Voltage Ω V 7. The VZ value is in D.C voltage measurement. The VZ may vary with coils in A.C. voltage measurements. AH2985 Document number: DS38175 Rev. 1 - 2 3 of 8 www.diodes.com September 2015 © Diodes Incorporated AH2985 Magnetic Characteristics (TA = +25C, VDD = 2.5V to 15V, Note 8) (1mT=10 Gauss) Parameter Min Typ Max Unit BOP Operate Point 5 30 60 Gauss BRP Release Point -60 -30 -5 Gauss BHY Hysteresis 20 60 120 Gauss 8. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering. Operating Characteristics DO RP OFF ON OP Output Voltage in Volts DOB Output Voltage in Volts NEW PRODUCT Note: Symbol VSAT BRP 0 OFF OP RP ON VSAT BOP BRP Magnetic Flux Density in Gauss 0 BOP Magnetic Flux Density in Gauss S Marking side N ( TO94) AH2985 Document number: DS38175 Rev. 1 - 2 4 of 8 www.diodes.com September 2015 © Diodes Incorporated AH2985 Performance Characteristics (1) TO94 TA(C) 25 50 60 70 80 85 90 95 100 PD(mW) 550 440 396 352 308 286 264 242 220 TA(C) 105 110 115 120 125 130 135 140 150 PD(mW) 198 176 154 132 110 88 66 44 0 NEW PRODUCT PD (mW) Power Dissipation Curve 600 500 400 300 200 100 0 -40 0 25 50 75 100 125 150 TA (oC) AH2985 Document number: DS38175 Rev. 1 - 2 5 of 8 www.diodes.com September 2015 © Diodes Incorporated AH2985 Ordering Information (Note 9) NEW PRODUCT AH2985 - X - X Part Number Package Code AH2985-P-B Note: Package Packing P: TO94 B : Bulk Bulk Packaging (Note 9) Quantity Part Number Suffix TO94 1000 -B P 9. For packaging details, go to our website at http://www.diodes.com/products/packages.html. Marking Information (1) TO94 (Top View) Part Number AH2985 Document number: DS38175 Rev. 1 - 2 2985 Y WW X Y : Year : 0~9 WW : Week : 01~52, "52" represents 52 and 53 week X : Internal Code : A~Z : Green 6 of 8 www.diodes.com September 2015 © Diodes Incorporated AH2985 Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version. (1) Package Type: TO94 0(2x) L c E b2 A A3 b e e1 D 02(2x) 03(2x) L Min/Max(in mm) 0.39/0.59 1.85/2.05 Die 1.55/1.75 NEW PRODUCT 01(2x) TO94 Dim Min Max Typ A 1.46 1.66 1.56 A3 0.76 b 0.35 0.56 0.39 b2 0.46 c 0.36 0.51 0.38 D 5.12 5.32 5.22 E 3.55 3.75 3.65 e 1.27 e1 3.81 L 13.50 15.50 14.50 L1 1.42 S 0.63 0.83 0.73 θ 6° θ1 4° θ2 11° θ3 6° All Dimensions in mm Hall Sensor AH2985 Document number: DS38175 Rev. 1 - 2 PART MARKING SURFACE 7 of 8 www.diodes.com September 2015 © Diodes Incorporated AH2985 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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