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ah2984 two phase hall-effect smart fan motor controller ah2984 document number: ds31698 rev. 3 - 2 1 of 11 www.diodes.com may 2010 ? diodes incorporated new product 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. 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. 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 ? average output current up to 500ma ? packages: sip-4l and sot89-5l ? ?green? molding compound pin assignments ah2984 12 4 3 1 : vdd 2 : do 3 : dob 4 : gnd (top view) sip-4l 1 2 3 7 4 5 dob do gnd nc vdd sot89-5l ah2984 (top view) gnd applications ? two-coil bldc cooling fans ? low voltage/ low power bldc motors
ah2984 two phase hall-effect smart fan motor controller ah2984 document number: ds31698 rev. 3 - 2 2 of 11 www.diodes.com may 2010 ? diodes incorporated new product typical application circuit (note 1) (1) for sip-4l vdd gnd 12v l1 l2 ah2984 12 3 4 d2 c d1 vdd do dob gnd 12v brushless dc fan (2) for sot89-5l ah2984 13 2 vdd (12v) l1 l2 d2 5 4 gnd c d1 nc dob vdd do gnd 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 powe r conditions. the ah2984 also includes an internal reverse blocking diode at vdd pin. pin descriptions pin name sip-4l sot89-5l description vdd 1 1 input power do 2 3 output pin dob 3 4 output pin gnd 4 2 ground nc - 5 no connection
ah2984 two phase hall-effect smart fan motor controller ah2984 document number: ds31698 rev. 3 - 2 3 of 11 www.diodes.com may 2010 ? diodes incorporated new product functional block diagram (1) for sip-4l hall plate control logic regulator lock detect, shutdown and automatic re-start vdd dob do amp. 1 2 3 4 gnd (2) for sot89-5l hall plate control logic regulator vdd dob do amp. 1 3 4 2 gnd nc 5 lock detect, shutdown and automatic re-start
ah2984 two phase hall-effect smart fan motor controller ah2984 document number: ds31698 rev. 3 - 2 4 of 11 www.diodes.com may 2010 ? diodes incorporated new product absolute maximum ratings (t a = 25 c) symbol conditions rating unit vdd supply voltage 18 v vrdd reverse vdd polarity voltage -15 v i o ( ave ) output current (note 2) 500 ma i o (p eak as hold ) 800 p d power dissipation sip-4l 550 mw sot89-5l 800 mw t st storage temperature -55 ~ 150 c t j maximum junction temperature 150 c ja thermal resistance (note 3) sip-4l 227 c/w sot89-5l 156 c/w t j t a tc jc ja notes: 2. shall not exceed p d and safety operation area. 3. ja should be confirmed with heat sink thermal resistance. if there is no heat sink contact, ja will almost be the same as jc . recommended operating conditions (t a = 25 c) symbol parameter conditions min max unit vdd supply voltage operating 2.5 15 v t a operating ambient temperature (note 2) operating -40 105 c
ah2984 two phase hall-effect smart fan motor controller ah2984 document number: ds31698 rev. 3 - 2 5 of 11 www.diodes.com may 2010 ? diodes incorporated new product electrical characteristics (t a = 25 c, vdd = 12v; unless otherwise specified, note 4) symbol characteristics conditions min typ. max unit idd supply current operating, vdd=12v 2.0 3.5 5.0 ma ton locked protection on time - 0.25 - sec toff locked protection off time - 3.25 - sec rduty locked protection duty ratio toff/ton - 13 - - rds(on) output on resistance i o = 300ma - 1 1.67 ohm i o = 500ma - 1.25 1.8 vz output zener-breakdown voltage (note 4) 24 33 42 v notes: 4. the vz value is in d.c voltage measurement. the vz may vary with coils in a.c. voltage measurements. magnetic characteristics (t a = 25 c, vdd = 2.5v to 15v, note 5) (1mt=10 gauss) symbol characteristics min typ. max unit bop operate point 5 30 60 gauss brp release point -60 -30 -5 gauss bhy hysteresis 20 60 120 gauss notes: 5. the magnetic characteristics may vary wi th supply voltage, operating temperature and after soldering.
ah2984 two phase hall-effect smart fan motor controller ah2984 document number: ds31698 rev. 3 - 2 6 of 11 www.diodes.com may 2010 ? diodes incorporated new product operating characteristics off op rp on output voltage in volts off rp op on output voltage in volts bop brp 0 bop brp 0 magnetic flux density in gauss magnetic flux density in gauss vsat vsat dob do marking side s ( sip-4l ) n marking side s (sot89-5l) n
ah2984 two phase hall-effect smart fan motor controller ah2984 document number: ds31698 rev. 3 - 2 7 of 11 www.diodes.com may 2010 ? diodes incorporated new product performance characteristics (1) sip-4l t a ( c) 25 50 60 70 80 85 90 95 100 p d (mw) 550 440 396 352 308 286 264 242 220 t a ( c) 105 110 115 120 125 130 135 140 150 p d (mw) 198 176 154 132 110 88 66 44 0 pow er dissipation curve 0 100 200 300 400 500 600 0 25 50 75 100 125 150 t a ( o c) p d (m w ) (2) sot89-5l t a ( c) 25 50 60 70 75 80 85 90 95 100 p d (mw) 800 640 576 512 480 448 416 384 352 320 t a ( c) 105 110 115 120 125 130 135 140 145 150 p d (mw) 288 256 224 192 160 128 96 64 32 0 power dissipation curve 0 100 200 300 400 500 600 700 800 900 0 25 50 75 100 125 150 t a (c) p d (m w ) -40 105 -40 105
ah2984 two phase hall-effect smart fan motor controller ah2984 document number: ds31698 rev. 3 - 2 8 of 11 www.diodes.com may 2010 ? diodes incorporated new product ordering information ah2984 - x g - x packing b : bulk p : sip-4l package green g : green 13 : tape & reel y : sot89-5l device package code packaging (note 6 & 7) bulk 13? tape and reel quantity part number suffix quantity part number suffix AH2984-PG-B p sip-4l 1000 -b na na ah2984-yg-13 y sot89-5l na na 2500/tape & reel -13 notes: 6. pad layout as shown on diodes inc. suggest ed 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 2984 part number (top view) y ww x x : internal code : a~z : green y : year : 0~9 ww : week : 01~52, " 52" represents 52 and 53 week (2) sot89-5l 1 2 3 5 7 4 (top view) y : year : 0~9 w : week : a~z : 1~26 week; x : internal code a~z : green a~z : 27~52 week; z represents 52 and 53 week xx : identification code xx y w x device package identification code ah2984 sot89-5l k1
ah2984 two phase hall-effect smart fan motor controller ah2984 document number: ds31698 rev. 3 - 2 9 of 11 www.diodes.com may 2010 ? diodes incorporated new product package outline dimensions (all dimensions in mm) (1) package type: sip-4l active area depth sensor location marking side 0.7mm 1. 1 ? 0.1mm 1234 1.95 ? 0.1mm package dimension
ah2984 two phase hall-effect smart fan motor controller ah2984 document number: ds31698 rev. 3 - 2 10 of 11 www.diodes.com may 2010 ? diodes incorporated new product package outline dimensions (continued) (2) package type: sot89-5l sensor location
ah2984 two phase hall-effect smart fan motor controller ah2984 document number: ds31698 rev. 3 - 2 11 of 11 www.diodes.com may 2010 ? diodes incorporated new product 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). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or an y product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of othe rs. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorp orated website, harmless against all damages. diodes incorporated does not warrant or accept any liability what soever in respect of any prod ucts purchased through unauthoriz ed sales channel. should customers purchase or use diodes in corporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives har mless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifica lly not authorized for use as critical co mponents in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when pr operly used in accordance with instructions for use provided in the labeling can be reasonably expected to re sult in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in t he safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsi ble for all legal, regulatory and safety-related requirements concerning their products and any use of diode s incorporated products in such safety-cri tical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its repr esentatives against any damages ar ising out of the use of diodes incorporated products in such safety-c ritical, life support devices or systems. copyright ? 2010, diodes incorporated www.diodes.com

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