preliminary datasheet single phase full-wave low voltage fan motor dr iver AM9799 sep. 2009 rev. 1. 0 bcd semiconductor manufacturing limited 1 general description the AM9799 is a single-phase dc brushless motor driver ic featuring bicmos process. it is suitable for fan motor drivers for low voltage equipment such as the note personal computers. the AM9799 includes lock shutdown, automatic restart, frequency generator (fg), have been incorporated into one chip. when the motor is under lock condition, lock shutdown function turns off the output current. when the lock condition is removed, the ic automatically restarts and allows dc fan to run. in addition, the fg function is to output rotation speed signal. it features mos-fet driver circuit for better saturation characteristics. slew late of amplifiers and feedback resistors are optimized to achieve low-noise motor operation. the AM9799 is available in msop-8 package. features ? lock detection and rotational speed sensing mechanisms are built-in ? rotor-locked protection and automatic restart when the motor lock is undone ? hall bias built-in and hall inputs have a hysteresis ? built-in thermal shutdown circuit ? built-in over current protection ? operating voltage: v cc =2v to 6v ? bicmos technology ? compact package: msop-8 applications ? cpu cooler fan in notebook personal computers figure 1. package type of AM9799 msop-8
preliminary datasheet single phase full-wave low voltage fan motor dr iver AM9799 sep. 2009 rev. 1. 0 bcd semiconductor manufacturing limited 2 pin configuration mm package (msop-8) 1 2 3 4 8 7 6 5 out2 h+ hb h- gnd out1 vcc fg figure 2. pin configuration of AM9799 (top view) pin description pin number pin name function 1 out2 driver out2 2 h+ hall input(+) 3 hb hall bias 4 h- hall input(-) 5 fg frequency generator 6 vcc power supply 7 out1 driver out1 8 gnd ground
preliminary datasheet single phase full-wave low voltage fan motor dr iver AM9799 sep. 2009 rev. 1. 0 bcd semiconductor manufacturing limited 3 functional block diagram figure 3. functional block diagram of AM9799 ordering information AM9799 - circuit type package temperature range part nu mber marking id packing type AM9799mm-g1 AM9799mm-g1 tube msop-8 -40 to 105 c AM9799mmtr-g1 AM9799mm-g1 tape & reel bcd semiconductor's pb-free products, as designated with "g1" suffix in the part number, are rohs compliant and green. g1: green tr: tape & reel blank: tube package mm: msop-8
preliminary datasheet single phase full-wave low voltage fan motor dr iver AM9799 sep. 2009 rev. 1. 0 bcd semiconductor manufacturing limited 4 absolute maximum ratings (t a =25 c, note 1) parameter symbol value unit supply voltage v cc 7 v output current i o (max) 1 a fg output current i fg 5 ma fg output voltage v fg 7 v lead temperature (soldering 10s) 260 c power dissipation p d 585 mw junction temperature t j 150 c thermal resistance (die to ambient) ja 214 c/w storage temperature range t stg -55 to 150 c esd (human body model) (note 2) esd 2000 v note 1: 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 co nditions? is not implied. exposure to ?absolute maximum ratings? for extended periods may affect device reliability. note 2: electronic semiconductor products are sensitive to electro static discharge (esd). always observe electro static discharge control procedures whenever handling semiconductor products. recommended operating conditions (t a =25 c) parameter symbol min max unit supply voltage v cc 2 6 v hall input voltage range v h 0.4 v cc -1.1 v operating temperature t op -40 105 c
preliminary datasheet single phase full-wave low voltage fan motor dr iver AM9799 sep. 2009 rev. 1. 0 bcd semiconductor manufacturing limited 5 -25 0 25 50 75 100 125 150 0 200 400 600 800 power dissipation (mw) ambient temperature ( o c) electrical characteristics v cc =5v, t a =25c, unless otherwise specified. parameter symbol conditions min typ max unit supply current i cc 4 6 ma input offset voltage v hofs 4 mv output saturation voltage v o i o =250ma upper and lower total 0.3 0.45 v input-output gain g in 45 48 50 db fg low voltage v fgl i fg =3ma 0.3 v input hysteresis voltage v hys 6 10 15 mv lock detection on time t on 0.35 0.5 0.7 sec lock detection off time t off 3.5 5 7 sec hall bias voltage v hb i hb =5ma 1.15 1.3 1.45 v typical performance characteristics figure 4. power dissipation vs. ambient temperature
preliminary datasheet single phase full-wave low voltage fan motor dr iver AM9799 sep. 2009 rev. 1. 0 bcd semiconductor manufacturing limited 6 h+ out1 out2 fg ton toff motor lock lock cancel reset motion ordinary thermal shut down (tsd) this ic is built-in tsd. tsd has the temperature hysteresis. output on output off 150oc 175oc tsd off tsd on tsd on (typ. 175 c ) all output transistor off. tsd off (typ. 150 c) reset ordinary motion. (it has the temperature hysteresis of 25 c ) figure 5. thermal shut down lock detection, automatic restart circuit this ic detects the rotation of the motor by hall signal, and adjusts lock detection on time (ton) and lock detection off time (toff) by the internal counter. these time (ton, toff) are showed below. figure 6. the function of rotor-locked prot ection and auto restart diagram of AM9799
preliminary datasheet single phase full-wave low voltage fan motor dr iver AM9799 sep. 2009 rev. 1. 0 bcd semiconductor manufacturing limited 7 typical application figure 7. typical application of AM9799
preliminary datasheet single phase full-wave low voltage fan motor dr iver AM9799 sep. 2009 rev. 1. 0 bcd semiconductor manufacturing limited 8 mechanical dimensions msop-8 unit: mm(inch)
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