AH2984

AH2984 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Description The AH2984 is a single-chip solution for driving two-coil brushless direct current (BLDC) fans and motors. The device includes a Hall-effect sensor, dynamic offset correction and two complementary open-drain output drivers with internal Zener diode protection. It is optimized for low start-up voltage. Pin Assignments (Top View) AH2984 1 : Vdd 2 : DO 3 : DOB 4 : GND 12 3 4 N EW PRODUCT To help protect the motor coils, the AH2984 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. The AH2984 is available in SIP4 and SOT89-5L packages. SIP-4L (Top View) Vdd 1 GND 2 DO 3 SOT89-5L AH2984 5 NC GND 7 DOB 4 Features • • • • • • • • • 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 Applications • • Two-coil BLDC Cooling Fans Low Voltage/ Low Power BLDC Motors Average output current up to 500mA Packages: SIP-4L and SOT89-5L “Green” Molding Compound AH2984 Document number: DS31698 Rev. 3 - 2 1 of 11 www.diodes.com May 2010 © Diodes Incorporated AH2984 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Typical Application Circuit (Note 1) (1) For SIP-4L 12V Vdd D2 AH2984 Vdd DO DOB GND L1 L2 1 2 N EW PRODUCT 3 4 GND D1 C 12V Brushless DC Fan (2) For SOT89-5L Vdd (12V) D2 5 NC Vdd 1 4 GND DOB AH2984 GND 2 DO 3 L1 L2 D1 C GND 12V Brushless DC Fan Notes: 1. D1 (Zener Diode) and Capacitor C are for power stabilization. Recommended value of C is 1uF/ 50V (E-Cap). Diode D2 is optional and helps to protect the device and fan coils from reverse power conditions. The AH2984 also includes an internal reverse blocking diode at Vdd pin. Pin Descriptions Pin Name Vdd DO DOB GND NC SIP-4L 1 2 3 4 SOT89-5L 1 3 4 2 5 Description Input Power Output Pin Output Pin Ground No Connection AH2984 Document number: DS31698 Rev. 3 - 2 2 of 11 www.diodes.com May 2010 © Diodes Incorporated AH2984 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Functional Block Diagram (1) For SIP-4L Vdd 1 N EW PRODUCT Lock detect, Shutdown and Automatic re-start Regulator 2 DO Hall Plate Amp. Control Logic 3 DOB 4 GND (2) For SOT89-5L Vdd 1 Lock detect, Shutdown and Automatic re-start Regulator 5 3 NC DO Hall Plate Amp. Control Logic 4 DOB 2 GND AH2984 Document number: DS31698 Rev. 3 - 2 3 of 11 www.diodes.com May 2010 © Diodes Incorporated AH2984 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Absolute Maximum Ratings (TA = 25°C) Symbol Vdd Vrdd IO(AVE) IO(peak as hold) PD Conditions Supply Voltage Reverse Vdd Polarity Voltage Output Current (Note 2) Power Dissipation Storage Temperature Maximum Junction Temperature Thermal Resistance (Note 3) SIP-4L SOT89-5L TA TJ Tc Rating 18 -15 500 800 550 800 -55 ~ 150 150 227 156 Unit V V mA mW mW °C °C °C/W °C/W SIP-4L SOT89-5L N EW PRODUCT TST TJ θJA θ JA θ JC Notes: 2. Shall not exceed PD and Safety Operation Area. 3. θJA should be confirmed with heat sink thermal resistance. If there is no heat sink contact, θJA will almost be the same as θJC. Recommended Operating Conditions (TA = 25°C) Symbol Vdd TA Parameter Supply Voltage Operating Ambient Temperature (Note 2) Conditions Operating Operating Min 2.5 -40 Max 15 105 Unit V °C AH2984 Document number: DS31698 Rev. 3 - 2 4 of 11 www.diodes.com May 2010 © Diodes Incorporated AH2984 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Electrical Characteristics (TA = 25°C, Vdd = 12V; unless otherwise specified, Note 4) Symbol Idd Ton Toff Rduty Rds(on) Vz Characteristics Supply Current Locked Protection On Time Locked Protection Off Time Locked Protection Duty Ratio Output On Resistance Output Zener-Breakdown Voltage Conditions Operating, Vdd=12V Min 2.0 24 Typ. 3.5 0.25 3.25 13 1 1.25 33 Max 5.0 1.67 1.8 42 Unit mA Sec Sec ohm V Toff/Ton IO= 300mA IO= 500mA (Note 4) N EW PRODUCT Notes: 4. The Vz value is in D.C voltage measurement. The Vz may vary with coils in A.C. voltage measurements. Magnetic Characteristics (TA = 25°C, Vdd = 2.5V to 15V, Note 5) (1mT=10 Gauss) Unit Gauss Gauss Gauss Symbol Bop Brp Bhy Notes: Characteristics Operate Point Release Point Hysteresis Min 5 -60 20 Typ. 30 -30 60 Max 60 -5 120 5. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering. AH2984 Document number: DS31698 Rev. 3 - 2 5 of 11 www.diodes.com May 2010 © Diodes Incorporated AH2984 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Operating Characteristics DOB DO Output Voltage in Volts RP OFF Output Voltage in Volts OFF OP N EW PRODUCT ON OP Vsat Brp 0 Bop RP ON Vsat Brp 0 Bop Magnetic Flux Density in Gauss Magnetic Flux Density in Gauss S Marking side S Marking side N ( SIP-4L ) N (SOT89-5L) AH2984 Document number: DS31698 Rev. 3 - 2 6 of 11 www.diodes.com May 2010 © Diodes Incorporated AH2984 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Performance Characteristics (1) SIP-4L TA(°C) PD(mW) TA(°C) PD(mW) P D (m W ) 25 550 105 198 50 440 110 176 60 396 115 154 70 352 120 132 80 308 125 110 85 286 130 88 90 264 135 66 95 242 140 44 100 220 150 0 P o w e r D is s ip a tio n C u rve 600 500 400 300 200 100 0 N EW PRODUCT 0 -40 25 50 75 100 105 125 150 TA (oC ) (2) SOT89-5L TA (°C) PD (mW) TA (°C) PD (mW) 25 800 105 288 50 640 110 256 60 576 115 224 70 512 120 192 75 480 125 160 80 448 130 128 85 416 135 96 90 384 140 64 95 352 145 32 100 320 150 0 P D (m W ) 900 800 700 600 500 400 300 200 100 0 -40 0 25 P ow er D iss ipation C urve 50 75 10 0 105 125 1 50 T A ( °C ) AH2984 Document number: DS31698 Rev. 3 - 2 7 of 11 www.diodes.com May 2010 © Diodes Incorporated AH2984 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Ordering Information AH2984 - X G - X Package P : SIP-4L Y : SOT89-5L Green G : Green Packing B : Bulk 13 : Tape & Reel 13” Tape and Reel Part Number Quantity Suffix NA NA 2500/Tape & Reel -13 N EW PRODUCT Device AH2984-PG-B AH2984-YG-13 Notes: Package Code P Y Packaging (Note 6 & 7) SIP-4L SOT89-5L Bulk Part Number Quantity Suffix 1000 -B NA NA 6. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. 7. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. Marking Information (1) SIP-4L (Top View) Part Number 2984 Y WW X Y : Year : 0~9 WW : Week : 01~52, "52" represents 52 and 53 week X : Internal Code : A~Z : Green (2) SOT89-5L (Top View) 5 4 7 XX Y W X 2 3 Package SOT89-5L 8 of 11 www.diodes.com 1 Device AH2984 AH2984 Document number: DS31698 Rev. 3 - 2 XX : Identification code Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : Internal code A~Z : Green Identification Code K1 May 2010 © Diodes Incorporated AH2984 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Package Outline Dimensions (All Dimensions in mm) (1) Package type: SIP-4L Marking side 1.1士0.1mm 1.95士0.1mm N EW PRODUCT 0.7 mm 1 2 3 4 Active Area Depth Package Dimension Sensor Location AH2984 Document number: DS31698 Rev. 3 - 2 9 of 11 www.diodes.com May 2010 © Diodes Incorporated AH2984 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Package Outline Dimensions (Continued) (2) Package type: SOT89-5L N EW PRODUCT Sensor location AH2984 Document number: DS31698 Rev. 3 - 2 10 of 11 www.diodes.com May 2010 © Diodes Incorporated AH2984 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER 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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