AN8428GAK

New Reduce external components and improve reliability For 3.5inch HDD Motor Comb IC／AN8428GAK ■ Overview AN8428GAK is motor comb IC for 3.5inch HDD. By new retract circuit ,reduce external components and shorten the brake time of the disk to improve reliability of HDD . Spindle motor sensor less linear drive. VCM linear drive , PWM-DAC control . Built-in Retract , 12 V/5 V/3.3 V power monitor, 3.3 V-Regulator. 80-pin TQFP package with exposed heat think . Unit : mm ■ Features ●By new retract circuit ,reduce external components and shorten the brake time 1/2 of the disk to improve reliability of HDD . ●Built-in shock sensor amplifier for mechanical shock protection and 3.3 V regulator for logic semiconductor . ●10 dB acoustic noise reduction by trapezoidal current on spindle motor drive . ●80- pin TQFP package with the smallest thermal resistance in the industry . Meet to increase speed of HDD higher 30 % than previous. HQFP080-P-1414 ■ Principle functions (1)Spindle motor sensor less linear drive :2.7 A peak current drivers , Ron=1.1 Ω (2)VCM linear drive : 1.8 A peak current , Ron=1.5 Ω (3)Retract function exists (4)Built in 12 V/5 V/3.3 V power monitor (5)Built in shock sensor amplifier (6)Built in 3.3 V regulator ■ Applications 3.5 inch HDD The products and specification are subject to change without any notice. Please ask for the latest Product Standards to guarantee the satisfaction of your product requirements. 1.Kotari Yakemachi, Nagaokakyo, Kyoto, 617-8520 Japan M00389AE Tel. (075)951-8151 http://www.mec.panasonic.co.jp New publication, effective from May.8.2000 ■ Standard application VCC1S12,2S12 VCCV12 VCCA12 VCC5 0.047 µ F BSTCP1 BSTCP2 VCC3.3 10 µ F 0.1 µ F,18V BSTFLT 57 78 10 µ F 2SB1073 Vcc5 100 XN4502 XN 4502 GNDSUBA 54 59 58 7,18,44,45 10 BOOSTER POWER ON RESET + － 9 POR5VADJ 3.3V out 4.7 µ F 1.32K 0.68 50 70 1800pF 8 POR12VADJ 0.047 µ F 4.125K SHOCK SENSOR FILTER 3VREGCNTL 3VREGBG 71 2 TIMER + － 11 POR3.3VADJ 0.01 µF SHKIN 3 － + 1800pF 12 CPOR CPOR VREF PORN SHKFLT 79 RETRACT VREF VCC4 － SHKOUT 13 SHOCK AMP 0.022 µ F VREFOUT 75 0.01 µ F VREF RETRACT & VCM VCMREF 23,24 VCMP 0.33 Ω + 62 X4 TEMP 50 VISENL 65 VISENH 1K Ω THERMAL WARNING 66 VISENS1 10k 5 15 6 VFLTOUT VPCNTL VPCNTL VFLTINP 1800pF VOICE COIL MOTOR 0.01 µ F VCM MODE 4 VCMINP 390pF 77 VIPWMH VIPWMH VIPWML VIPWML 76 14 PWM DAC VREF FAIL SAFE RETRACT － 19 ,20 21,22 25,26 16 220K VCMN 10k RETRACT + FAILSAFE GND-V RX RETRACT ADJ RETPOWER LOGIC DEVICE SMODE1 1 µF RETRACT 17 52 56 33, RY SDRVN SDRVU SMODE1 SCNTL1 SCNTL1 SCNTL2 SCNTL2 SCNTL3 SCNTL3 SIPWM SIPWM SENU SENU SENWIS SENWIS SENV SENV SPINDLE MODE 69 68 SPINDLE CURRENT CONTROL OUTPUT STAGE MA10702 34 41, 42 COMMUTATION 67 SDRVV SPINDLE MOTOR 51 FILTER 74 72 73 BEMFCOMPARATOR SDRVW SDRVU SDRVV SDRVW 29,30 46 47 28 SISENL SISENH SISINK1 SISINK2 SISINK3 SISINK4 SISINK5 SISINK6 VCC5 SPWMTC 31 53 PWM 34k 220pF 32 35 36 37 0.18 Ω 1 SLOPEC 55 SPWMFLT 48 49 43 SCOMP ANALOG GND 680pF 0.047 µF 0.047 µF SHPWR 0.47 µ F ■ Maximum Ratings PARAMETER Supply voltage +3.3 V Supply voltage +5V Supply voltage +12V Output voltage (Spindle) Output voltage (VCM) Spindle Motor Peak Output Current Voice coil Motor Peak Output Current SYMBOL Vcc3.3 Vcc5 Vcc12 V SDRV V VCMN,VCMP Ratings - 0.3 ～6.0 - 0.3 ～6.0 - 0.3 ～13.5 - 0.3 ～15 - 0.3 ～15 3.0 2.0 　 unit V V V V V A A I Ospeak I Ovpeak ■ Supply voltage range +3.3 V Supply voltage range +5V Supply voltage range +12V Supply voltage range +12V Supply voltage range +12V Supply voltage range V CC3.3 V CC5 3.0 V ～ 4.5 V ～ 5.5 V 5.5 V V V V V V V CCS12 10.8 V ～ 13.2 V V CCV12 10.8 V ～ 13.2 V V CCA12 10.8 V ～ 13.2 V ■ Electrical Characteristics（Ta=25 ℃±2 ℃ unless otherwise specified ） PARAMETER +3.3 V Supply Current +5V Supply Current +12 V Supply Current SYMBOL I CC3.3 I CC3.3 S I CC5 I CC5S I CC12 I CC12S Conditions Linear mode Sleep mode Linear mode Sleep mode Linear mode Sleep mode min － － － － － － typ 1.1 1.1 16.0 14.0 35.0 10.0 max 3.0 3.0 20.0 － 55.0 － unit mA mA mA ［Power Monitor Comparators］ 12V Threshold voltage 5V Threshold voltage t12 V 8.7 4.2 9.0 4.3 9.3 4.4 V V V t5 ℃± ■ Electrical Characteristics（Ta=25 ℃±2 ℃ unless otherwise specified ） PARAMETER ［SPM block］ Total Output on Resistance Voltage Ratio SPWMFLT/SISENH Voltage at pin SISENH for 100% duty cycle Voltage at pin SISENH for 50% duty cycle Voltage at pin SISENH for 5% duty cycle Voltage at pin SISENH for 0% duty cycle SYMBOL Conditions min typ max unit Rds( on) Iout =2.7 A － 0.65 1.1 Ω KSP V 100 V 50 V 5 V 0 4.8 0.33 0.160 5.1 0.348 0.18 0.018 5.4 0.376 0.200 0.026 V/V V V V mV － － 0.0 2.0 ［VCM block］ Vretract Regulation V RET2 Irtrct2 Supply OFF VBEMF=2V VCM=10.5 Ω 0.55 0.87 1.15 V Irtrct2 Current Ratio between MSB／LSB Time of Crossover Distortion Symmetry VCM Drivers VCMP , VCMN 15 31.5 80 32 130 32.7 mA Ratio TCRO Ratio I2 I1 Ratio Ramp Input VCMINP 20 μs I 2=I RVCM at Duty Cycle =10% I 1=I RVCM at Duty Cycle=90% RS=0.33,R 1=10k,R2=6.6k, RL =10 Ω I 2=I RVCM at Duty Cycle =30% I 1=I RVCM at Duty Cycle=70% I 0=I RVCM at Duty Cycle=50% RS=0.33,R 1=10k,R2=6.6k, RL =10 Ω － 2 5 μs 0.93 1 1.07 mA/mA Linearity VCM Drivers VCMP , VCMN = I 2- I 0 I 1- I 0 0.97 1.0 1.03 mA/mA Total Resistance (Source＋Sink＋Isolation) RDSON25 IPWMH V V & IPWNL at 50% Duty Cycle RS=0.33, R1=10K, R2 =6.6 K, R L=10 Ω － 1.0 1.5 Ω VCM Output Drivers Offset Current Ios -28 0 28 mA [Shock sensor] Input Current of Shock Sensor Amplifier Gm of Shock Sensor Amplifier I SHKIN Gmshk -1 － 5.9 1 - nA - mS [3.3 V－Regulator] Output voltage Regulation Load Regulation VCC3V3 ΔVLDR ILOAD=0～4mA 3.168 - 3.33 33 3.49 - V mV