AT5560

AT5560 Preliminary Product Information VCM Driver for Mobile Phone Features •Low voltage operation ( VCC = 2.8V) •Low saturation voltage. •Low operating current. •Constant current control by IM pin. •DFN-6 & SC-70 Package General Description The AT5560 is a 1-channel low-saturation, low-voltage voice coil motor driver IC for Mobile Phone or portable application. Applications • Voice coil motor Block Diagram Pin Configuration Aimtron reserves the right without notice to change this circuitry and specifications. 7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2006/08/24 REV:0.4 Email: service@aimtron.com.tw 1 AT5560 Preliminary Product Information VCM Driver for Mobile Phone Pin Description DFN-6 Pin NO. 1 2 3 4 5 6 Symbol VCC IN OUT IM GND PD I/O P I O I G I Power supply Input pin to set the constant current. Motor output pin Current detection terminal for constant current Ground Power down control pin Description SC-70 Pin NO. 1 2 3 4 5 6 Symbol OUT IN VCC PD GND IM I/O O I P I G I Motor output pin Input pin to set the constant current. Power supply Power down control pin Ground Current detection terminal for constant current Description Absolute Maximum Ratings (Ta=25°C) Item Supply voltage VCC Input voltage Maximum output current Power dissipation Operating temperature Junction temperature Storage temperature range ESD Susceptibility *2 Symbol VCC VIN Iout Pd Topr Tj Tstg HBM MM Ratings 6.0 VCC+0.4 200 300 -40~125 ~ +150 -60 ~ +150 4 200 Unit V V mA mW °C °C °C KV V 1. Stresses beyond 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 in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2. Device are ESD sensitive. Handling precaution recommended. The Human Body model is a 100pF capacitor discharged through a 1.5KΩ resistor into each pin. 7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2006/08/24 REV:0.4 Email: service@aimtron.com.tw 2 AT5560 Preliminary Product Information VCM Driver for Mobile Phone Recommended Operating Conditions (Ta=25°C) Item Supply voltage VCC Control input voltage H Bridge output current Logic input frequency Symbol VCC VIN Iout Fin Ratings +2.0 ~ +5.5 0 ~ VCC 100 0 ~ 100 Unit V V mA kHz Electrical Characteristic Parameter Whole circuits Supply voltage Circuit current during PD Circuit current IN / PD pin H level input voltage L level input voltage H level input current L level input current Driver output Output constant current Output current during PD Saturation voltage IOUT IOUT,PD VSAT RNF =1.5 Ω , PWM input control PD=L IOUT =100mA VINH VINL IINH IINL VPD=3V VPD=0V VCC ICCST PD=L ICC PD=H, IN=0V Symbol Condition (Unless otherwised noted Ta=25 °C , VCC=2.8V) Values Min. Typ. Max. Unit 2.0 --- 2.8 0.1 0.3 5.5 5 0.5 V μA mA VCC *0.8 -0.4 --5 ---0 VCC +0.4 VCC *0.2 5 - V V μA μA 10 --- --0.12 120 5 0.20 mA μA V 7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2006/08/24 REV:0.4 Email: service@aimtron.com.tw 3 AT5560 Preliminary Product Information VCM Driver for Mobile Phone Typical Application Circuit DFN-6 package VCC 2.0V~5.5V 10uF /6.3V 6 1 CL 3 VCM VCC OUT ENABLE PD AT5560 IM 4 RNF 1.5 PWM signal R1 2 IN GND 5 R2 C1 PWM signal Vpp D% x Vpp D% = TON T TON T Fig 1：Typical application circuit for AT5560 (DFN-6 package). 7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2006/08/24 REV:0.4 Email: service@aimtron.com.tw 4 AT5560 Preliminary Product Information VCM Driver for Mobile Phone Typical Application Circuit SC-70 package VCC 2.0V~5.5V 10uF /6.3V 4 3 CL 1 VCM VCC OUT ENABLE PD AT5560 IM 6 RNF 1.5 PWM signal R1 2 IN GND 5 R2 C1 PWM signal Vpp D% x Vpp D% = TON T TON T Fig 2：Typical application circuit for AT5560 (SC70 package). 7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2006/08/24 REV:0.4 Email: service@aimtron.com.tw 5 AT5560 Preliminary Product Information VCM Driver for Mobile Phone Application Information AT5560 provides constant current which can be evaluated by following equation. VIN . I= 10 × RNF (1) It’s obviously that the accuracy value of constant current not only depends on the resistance, RNF, between IM pin and GND, but also the input voltage, VIN. In order to get the suitable and stable input voltage level, VIN, the PWM signal must be low-pass filtered by R1, R2, and C1. The input voltage should be calculated by following equation. VIN = R2 R2 × VPWM = × D% × VPP - , R1 + R2 R1 + R2 (2) where D% means duty ratio of PWM signal, and Vpp is the amplitude of PWM signal. By setting different value of duty ratio of PWM signal, the corresponding voltage at IM pin we can get, then the constant current also be set simultaneously. As Fig 2 shows, in order to get the suitable and stable input voltage level, VIN, the PWM signal must be low-pass filtered by R1, R2, and C1. The values of R1, R2, and C1 will determine -3dB frequency and DC value of VIN. The -3dB frequency can be got by ω 3dB = (R1//R2) × C1 1 . (3) For accuracy and stable value of constant current, the input voltage, VIN, should be a DC value. So, it is suggested that the frequency of PWM signal must be larger than 100 times of -3dB frequency. ω 3dB = 1 ω PWM 100 (4) As above condition, to choose the R1, R2, and C1 is necessary for DC value of input voltage corresponding PWM signal. The following procedure will explain how to design the R1, R2, and C1. For PWM signal frequency, fPWM=100KHz, the sense resistance, RNF=1.5 Ω , the desired maximum output constant current is 70mA when duty ratio of PWM signal is 95%. The Vpp=2.8V, choosing R1, R2, and C1. f 3dB = 1 1 = × f PWM = 1KHz 2π × (R1//R2 ) × C1 100 If choosing C1=0.1uF, the (R1//R2)=1.59KΩ. And owing to equation (1) and (2), therefore, VIN R2 10 × 0.07 × 1.5 = = ≈ 0.394 . R1 + R2 D% × VPP 95% × 2.8 Thus, R1=4.03KΩ, R=2.63 KΩ can be get. 7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2006/08/24 REV:0.4 Email: service@aimtron.com.tw 6 AT5560 Preliminary Product Information VCM Driver for Mobile Phone The following diagrams show the characteristic curve for the voltage at IM pin vs. duty ratio of PWM signal and output current vs. duty ratio of PWM signal. At this example, the PWM frequency is 20KHz, the sense resistance, RNF=1.5Ω, and the R1=13KΩ, R2=20KΩ, and C1=0.1uF are set in front of IN pin respectively. Above settings can make AT5560 output 90mA when duty ratio of PWM signal is 80%. From result, the correlation of output current and duty ratio of PWM signal is highly linear. IN pin voltage vs. duty ratio of PWM VCC=2.8V 1.6 1.4 1.2 100.0 90.0 80.0 Output current vs. duty ratio of PWM VCC=2.8V Output current (mA) IN pin voltage (V) 70.0 60.0 50.0 40.0 30.0 20.0 10.0 0.0 PWM 20KHz 1.0 0.8 0.6 0.4 0.2 0.0 0 20 40 60 80 100 PWM 20KHz 0 20 40 60 80 100 Duty ratio of PWM (%) Duty ratio of PWM (%) The smaller value of sense resistance, RNF, will cause lesser voltage variation at voltage IM pin. The accuracy of output current is closely dependent on voltage at IM pin. Another reason choosing smaller value of RNF is that the decreasing voltage drop at IM pin can crease the maximum output driving current when the PVCC is fixed. So RNF=1.5Ω is the better choice. 7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2006/08/24 REV:0.4 Email: service@aimtron.com.tw 7 AT5560 Preliminary Product Information VCM Driver for Mobile Phone Package Description : DFN-6 7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2006/08/24 REV:0.4 Email: service@aimtron.com.tw 8 AT5560 Preliminary Product Information VCM Driver for Mobile Phone Package Description : SC-70 SYMBOL A A1 A2 b b1 c c1 D E E1 e e1 L Θ Θ1 INCHES MIN MAX 0.031 0.043 0.000 0.004 0.031 0.040 0.006 0.012 0.006 0.010 0.003 0.010 0.003 0.008 0.074 0.084 0.078 0.086 0.045 0.055 0.0255 BSC. 0.0512 BSC. 0.010 0.018 8o 0o 10o 4o MILLIMETERS MIN MAX 0.80 1.10 0.00 0.10 0.80 1.00 0.15 0.30 0.15 0.25 0.08 0.25 0.08 0.20 1.90 2.15 2.00 2.20 1.15 1.35 0.65 BSC. 1.30 BSC. 0.26 0.46 0o 8o 4o 10o NOTES - 7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 2006/08/24 REV:0.4 Email: service@aimtron.com.tw 9 AT5560 Preliminary Product Information VCM Driver for Mobile Phone Reflow Profiles Profile Feature Sn-Pb Eutectic Assembly Pb-Free Assembly Large Body Small Body Large Body Small Body Pkg. thickness Pkg. thickness Pkg. thickness Pkg. thickness ≥2.5mm or Pkg.