AN8428GAK PANASONIC

Document overview

  • Manufacturer or author: Provided By digicamel.com
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Technical content

The products and specification are subject to change without any notice. Please ask for the latest Product Standards to guarante e the satisfaction of your product requirements. M00389AE New publication, effective from May.8.2000 ■ 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 . ■ Applications 3.5 inch HDD ■ 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 Reduce external components and improve reliability For 3.5inch HDD Motor Comb IC／AN8428GAK ■ 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. New Unit : mm HQFP080-P-1414

■ Standard application BSTCP1 POWER ON RESET RETRACT VCM SPINDLE SCOMP SPWMFLT 0.047 µF ANALOG GND SHPWR 0.47 µF SISENL SISENH SISINK1 SISINK2 SDRVW 0.18Ω SDRVV SDRVU SDRVN SPINDLE MOTOR VCMN VISENL VISENH VISENS1 VFLTOUT VCMINP VCMP 0.33 Ω 10k 390pF 220K VOICE COIL MOTOR 1KΩ 0.01 µF CPOR 0.022 µFCPOR POR3.3VADJ POR5VADJ 0.1 µF,18V BSTFLT 0.047 µFBSTCP2 VCC5 10 µF 10 µF VCC1S12,2S12 VCCA12 PORN TEMP VREFOUT VPCNTL 1800pF VFLTINP LOGIC DEVICE VIPWMH VIPWMH VIPWML VIPWML SMODE1 SCNTL1 SCNTL1 SCNTL2 SCNTL2 SCNTL3 SCNTL3 SIPWM SIPWM SENU SENWIS SENU SENWIS SENV SENV SPWMTC VCC5 34k 220pF 0.047 µF OUTPUT STAGE SDRVW SDRVV SDRVUBEMF- COMPARATOR PWM COMMUTATION CURRENT CONTROL FILTER VREF THERMAL WARNING PWM DAC VREF VCMREF SPINDLE MODE VCM MODE VREF RETRACT BOOSTER TIMER 10k 1µF FAIL SAFE RETRACT 3VREGCNTL 3VREGBG RETRACT 0.68 1.32K 4.125K 100 Vcc5 POR12VADJ RETPOWER SMODE1 3.3V out SLOPEC VPCNTL RETRACT RETRACT ADJ VCC3.3 GNDSUBA FAILSAFE GND-V 680pF 0.047 µF4.7µF VCC4 23,24 ,20 21,22 25,26 33, 41, 29,30

32 SISINK3

59 58 57 78 7,18,44,45 10 SHOCK AMP SHKIN SHKFLT SHKOUT SHOCK SENSOR VCCV12 0.01 µF FILTER VREF 1800pF 0.01 µF 1800pF RX RY 2SB1073 XN4502 XN 4502 MA10702

+5V +12V Output voltage (Spindle) Vcc12 - 0.3 ～13.5 Supply voltage - 0.3 ～6.0 VVCMN,VCMP Vcc5 VSDRV (VCM) - 0.3 ～15 - 0.3 ～15 V V V V +5V VCC5 VCCS12 VCCV12 ～4.5 V 5.5 V 10.8 V 13.2 V～+12V +12V +12V VCCA12 10.8 V 13.2 V～ 10.8 V 13.2 V～ V V V V +3.3 V Supply voltage range VCC3.3 ～3.0 V 5.5 V V I Ospeak 3.0 2.0 A I Ovpeak A ■■■■ Maximum Ratings PARAMETER SYMBOL Ratings unit ■■■■ Supply voltage range ■■■■ Electrical Characteristics（Ta=25 ℃±2 ℃ unless otherwise specified ） min typ max mAI CC5S 14.0 +5V mAI CC12 35.0 55.0+12V I CC5 16.0 20.0 I CC12S 10.0 +3.3 V Supply Current I CC 3.3 I CC 3.3 S Linear mode Sleep mode mA 1.1 1.1－ － 3.0 3.0 V Vt12 Vt5 4.2 ［Power Monitor Comparators］ 12V Threshold voltage V9.39.08.7 4.3 4.4 Conditions Supply voltage Supply voltage Output voltage Spindle Motor Peak Output Current Voice coil Motor Peak Output Current Supply voltage range Supply voltage range Supply voltage range Supply voltage range PARAMETER SYMBOL unit Supply Current Supply Current Linear mode Linear mode Sleep mode Sleep mode 5V Threshold voltage

0.65 1.1 ΩRds( on) Total Output on Resistance Iout =2.7 A － 4.8 0.026 V V Voltage at pin SISENH for 100% duty cycle V100 V50 0.018 Voltage Ratio SPWMFLT/SISENH KSP 5.1 5.4 V/V 0.33 0.348 0.376 0.18 V 0.160 0.200 2.00.0 mVV0 － 0.87Vretract Regulation VRET2 V0.55 1.15Supply OFF Irtrct2 Irtrct2 VBEMF=2V 130 mA8015VCM=10.5 Ω Current Ratio between MSB／LSB 31.5 32 32.7Ratio Total Resistance (Source＋Sink＋Isolation) 1.51.0 ΩRDSON25 － Linearity VCM Drivers VCMP , VCMN I 2 I 1 = I 2- I 0 I 1- I 0 0.93 1 1.07 0.97 1.0 1.03 Time of Crossover Distortion μs25TCRO I 2=IRVCM at Duty Cycle =10% I 1=IRVCM at Duty Cycle=90% RS=0.33,R 1=10k,R2=6.6k, RL =10 Ω mA/mA Ios VCM Output Drivers Offset Current -28 0 28 mA VIPWMH & VIPWNL at 50% Duty Cycle RS=0.33, R1=10K, R2 =6.6 K, RL=10 Ω Input Current of Shock Sensor Amplifier ISHKIN -1 － 1 - -Gmshk [Shock sensor] mS nA 5.9 mA/mA Ratio Ramp Input VCMINP 20 μs Ratio I 2=IRVCM at Duty Cycle =30% I 1=IRVCM at Duty Cycle=70% I 0=IRVCM at Duty Cycle=50% RS=0.33,R 1=10k,R2=6.6k, RL =10 Ω Symmetry VCM Drivers VCMP , VCMN [3.3 V－－－－Regulator] Output voltage Regulation VCC3V3 3.168 3.33 3.49 V Load Regulation ΔVLDR 33 mV- -ILOAD=0～4mA ConditionsPARAMETER SYMBOL unit Voltage at pin SISENH for 50% duty cycle Voltage at pin SISENH for 5% duty cycle Voltage at pin SISENH for 0% duty cycle Gm of Shock Sensor Amplifier