A Product Line of Diodes Incorporated AM4964 SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER Description Pin Assignments (Top View) For system flexibility, the motor speed can be controlled by an external PWM signal and temperature sensed by Thermal resister at the same time. Based on external input PWM and temperature signals, the AM4964 adjusts the output PWM duty cycle. If the input PWM duty is constant, the output PWM duty varies with temperature sensed by Thermal resister sensor between the low and high temperature corners. If the temperature signal is constant, the output duty varies with the external input PWM duty. The low and high temperature corners and the output PWM duty gap between these temperature corners are adjustable NC 1 20 NC PGND 2 19 OUT1 OUT2 3 18 TA VCC 4 17 TH VMIN 5 16 SGND PWM 6 15 CT CF 7 14 RADJ FG 8 13 IN- RT 9 12 HB TL 10 11 IN+ To help protect the motor coil, the AM4964 provides a rotor lock protection which shuts down the output if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. AM4964 provides a tachometer output Frequency Generator (FG). The FG output is the magnetic change frequency. The AM4964 is available in TSSOP-20EP package. TSSOP-20EP Features Applications Flexible Speed Control Options Combined PWM+Thermistor Speed Control PWM Speed Control DC Voltage Speed Control Adjustable Low and High Temperature Corners Full Speed When Thermal Resistor is Shorted Adjustable Output Duty Gap between High and Low Temperature when 100% PWM Input Built-in oscillator – No external capacitor Built-in Minimal Speed Setup Circuit Alpha Slope Adjustable Rotation Speed Indicator (FG) Built-in Temperature Control Circuit Built-in Thermal Shutdown Circuit Lock Protection and Auto-restart Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) Notes: EXPOSED PAD NEW PRODUCT The AM4964 is highly integrated feature rich single phase Brushless Direct Current (BLDC) full wave motor driver with combined PWM and temperature speed control function for fans, blowers and extractors. CPU Cooler Fan in PC Brushless DC Motor Driver 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. AM4964 Document number: DS37241 Rev. 2 - 2 1 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Typical Applications Circuit L1 D1 V+ C1 1F PGND OUT1 OUT2 TA 18 4 VCC TH 17 SGND 16 6 7 R4 8 C3 1F 9 RT D3 3 5 R3 20 19 R1 R2 NC 2 D2 VCC NC 10 VMIN PWM CF AM4964 NEW PRODUCT 1 R7 R9 V+ CT C2 0.47F 15 RADJ 14 IN- 13 HB 12 IN+ 11 FG R5 R6 Hall RT TL R8 AM4964 Document number: DS37241 Rev. 2 - 2 2 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 NEW PRODUCT Pin Descriptions Pin Number Pin Name 1,20 NC Not connected 2 PGND Power ground 3 OUT2 Fan driver output2 4 VCC Power supply 5 VMIN Minimum speed setting pin 6 PWM PWM pulse input terminal 7 CF Filter capacitor 8 FG FG signal output 9 RT RT signal output 10 TL Low temperature set resistor 11 IN+ Hall sensor input+ 12 HB Hall bias voltage 13 IN- Hall sensor input- 14 RADJ 15 CT 16 SGND 17 TH High temperature set resistor 18 TA Output duty gap adjust pin between low and high temperature at 100% input duty 19 OUT1 Exposed pad AM4964 Document number: DS37241 Rev. 2 - 2 Function Output pulse duty/input pulse duty adjustable terminal Lock protect and auto start Signal ground Fan driver output1 Central exposed pad – The central exposed pad is for thermal dissipation. On PCB layout, the exposed pad can be connected to GND or remain unconnected to any other signals 3 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Functional Block Diagram V+ 5 VMIN V+ 42k V+ 8 51k NEW PRODUCT Thermal Shutdown Triangle Wave 104k 14 RADJ V+ 6 PWM Predriver 90k 17k 56k 18k 54k 4 7 CF FG 93k VCC Control Circuit 9 RT V+ 3 10 TL OUT2 17 TH Vreg 18 TA 19 Hysteresis Amp 11 IN + 13 IN - OUT1 Lock Shutdown and Auto Restart 1.25V 12 15 HB 2 16 CT SGND PGND Truth Table Items IN- IN+ 1 H L CF CT OUT1 OUT2 FG Mode H L L Rotation L H Off PWM Off L 2 L H L 3 H L 4 L H 5 H L Off L L Rotation Recirculation L Off Off PWM Off H Off L Off H Off H L 6 L H AM4964 Document number: DS37241 Rev. 2 - 2 H Lock Protection 4 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Absolute Maximum Ratings (Note 4) (@TA = +25°C, unless otherwise specified.) NEW PRODUCT Symbol Rating Unit VCC Supply Voltage 18 V IOUT Output Current 1.0 A VOUT Output Voltage 18 V VFG FG Output Voltage 18 V IFG FG Output Current 10 mA PD Power Dissipation 1.1 W -55 to +150 °C Thermal Resistance (Junction to Ambient) (Note 5) 114 °C/W ESD ESD (Human Body Model) 3000 V ESD ESD (Machine Model) 300 V TSTG JA Notes: Parameter Storage Temperature Range 4. 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 Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability 5. TSSOP-20EP exposed pad is soldered to minimum recommended landing pads (see Package Outline Dimension section) on a 4.0mm x 3.0mm twolayer 2oz.copper FR4 PCB (1.6mm thickness) with four thermal vias in the exposed PAD to the copper flood on the bottom layer. See thermal de-rating curves in the thermal performance section. Recommended Operating Conditions Symbol Parameter Min Typ Max Unit VCC Supply Voltage 3.5 12 16 V VIN+ Hall Input Voltage + 0.2 – 3 V VIN- Hall Input Voltage - 0.2 – 3 V TA Ambient Temperature -30 – +90 °C AM4964 Document number: DS37241 Rev. 2 - 2 5 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Electrical Characteristics Symbol (@VCC=12V, TA=+25°C, unless otherwise specified.) Parameter IQ1 Conditions Min Typ Max VCT=L 10.15 15 18.75 VCT=H 5.35 8 10.5 Quiescent Current NEW PRODUCT IQ2 Unit mA VSATH Output Saturation Voltage at High Side ISOURCE=200mA – 1.0 1.17 V VSATL Output Saturation Voltage at Low Side ISINK=200mA – 0.2 0.3 V fPWM CPWM Frequency – 18 25 32 kHz VCPWMH CPWM High Level Voltage – 3.40 – 3.8 V VCPWML CPWM Low Level Voltage – 1.8 – 2.3 V – 2.95 – 3.35 – 2.95 – 3.45 – 2.35 – 2.85 – 1.75 – 2.25 – 3.65 – 4.15 – 3.75 – 4.25 VCFH1 CF High Level Voltage VCFH2 VCFL1 CF Low Level Voltage VCFL2 VADJ1 RADJ Pin Voltage VADJ2 V V V VMIN VMIN Voltage – 2.48 – 3.22 V VHB Bias – 1 – 1.5 V VHYS Hall Input Hysteresis – – ±10 ±20 mV VCTH CT High Level Voltage – 3.55 3.7 3.88 V VCTL CT Low Level Voltage – 1.55 1.7 1.85 V ICHG CT Charge Current – 1.15 2 3.55 µA IDHG CT Discharge Current – 0.115 0.2 0.355 µA RCD CT Charge and Discharge Ratio ICHG/IDHG 8.5 10 14.5 – VFGL FG Output Low Level Voltage IFG=5mA – 0.2 0.3 V ILFG FG Leakage Current VFG=7V – – 30 µA AM4964 Document number: DS37241 Rev. 2 - 2 6 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Functional Descriptions HB – Hall Bias Output This is a 1.25V nominal voltage source to bias a differential un-buffered Hall element sensor. If a Hall element requires a lower voltage than the H-Bias output, connect an appropriate value resistor between the HB pin and the Hall element supply pin. PWM – Pulse Width Modulate Signal Input Pin The PWM signal is applied at this pin and then be translated to be stable voltage to control the motors rotate speed. TL – Low Temperature Corner Set Pin A resistor (R8) is connected between TL and ground to adjust the low corner temperature. 40 38 o Low Corner Temperature ( C) NEW PRODUCT IN+ and IN- – Hall Inputs The rotor position is detected by a Hall sensor, with the output applied to the IN+ and IN- pins. This sensor can be either a 4 pin 'naked' Hall device or of the 3-pin buffered switching type. For a 4-pin device the differential Hall output signal is connected to the IN+ and IN-pins. For a buffered Hall sensor the Hall device output is attached to the IN+ pin, with a pull-up attached if needed, whilst the IN- pin has an external potential divider attached to hold the pin at half VREF. When IN+ is high in relation to IN-, OUT2 is the active drive. RT=TSM2A103F39H1RZ 36 34 32 30 28 26 24 5 6 7 8 9 10 R8 (k) Low Temperature Corner Value vs. R8 Resistor Value AM4964 Document number: DS37241 Rev. 2 - 2 7 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Functional Descriptions (cont.) TH – High Temperature Corner Set Pin A resistor (R9) is connected between TH and ground to adjust the high corner temperature. High corner temperature can be estimated by: TH=TL+5*R9/100. Input Duty Cycle=100% 40 o NEW PRODUCT High Corner Temperature ( C) 42 38 36 34 32 40 60 80 100 120 140 160 180 200 220 240 R9 (k) High Temperature Corner vs. R9 TA – Output Duty Gap Adjust between High and Low Temperature Corners When Input Duty is 100% A resistor (R7) is connected between TA and ground to adjust the output PWM duty gap between high temperature and low temperature corners when the external input PWM duty is 100%. 100 Output Duty Cycle (%) 80 60 40 20 Low Temperature High Temperature The Gap Between Low and High Temperature 0 0 100 200 300 400 500 600 700 800 900 1000 R7 (K) Output PWM Duty vs. R7 AM4964 Document number: DS37241 Rev. 2 - 2 8 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Functional Descriptions (cont.) CF –CF Capacitor Pin A capacitor is connected to this pin as a filter to translate PWM signal to be stable voltage. The resistors R3 and R4 are connected to CF pin to adjust the maximum speed at high temperature and low temperature corners. 100 100 R3=360K R3=1M R3 open R4=150K R4=390K R4 open 80 Output Duty (%) Output Duty (%) 80 60 40 60 40 20 20 0 0 0 20 40 60 80 0 100 20 40 60 80 100 Input Duty (%) Input Duty (%) Output PWM Duty vs. R3 and R4 at Low Temperature Adjust the maximum speed vs. input PWM duty to approximately match the target specification using R3 and R4 at high temperature (T>TH, V8>V7+0.7V). 100 100 R3=360K R3=1M R3 open R4=150K R4=390K R4 open 80 Output Duty (%) 80 Output Duty (%) NEW PRODUCT Adjust the maximum speed vs. input duty to approximately match the target specification using R3 and R4 at low temperature (T<TL, V8<V7); Measure the fan rotating speed vs. input duty. And draw a curve figure accordingly (Step=5%). 60 40 60 40 20 20 0 0 0 20 40 60 80 0 100 20 40 60 80 100 Input Duty (%) Input Duty (%) Output PWM Duty vs. R3 and R4 at High Temperature AM4964 Document number: DS37241 Rev. 2 - 2 9 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Functional Descriptions (cont.) RADJ – Adjust the Line Slope of the Input PWM Duty vs. Output PWM Duty at the OUT1 and OUT2 Adjust Slope K of the fan rotating speed（or output duty）vs. input duty to approximately match the target specification using R5 and R6. 100 100 R5=100K R5=270K R5 is open R6=100K R6=270K R6 open 80 Output Duty (%) Output Duty Cycle (%) 60 40 60 40 20 20 0 0 0 10 20 30 40 50 60 70 80 90 0 100 20 40 60 80 100 Input Duty (%) Input Duty (%) Output PWM Duty Slope K vs. Input PWM Duty with Slope K R5 and R6 VMIN – Minimum Speed Setting A voltage can be set on this pin via a potential divider between the VREF (or Supply) and GND pins. This voltage is monitored by the PWM pin to clamp the PWM control voltage so that it does not rise above VMIN voltage. As a higher voltage on the PWM pin represents a lower speed, the VMIN setting prevents the motor speed going lower than the minimum speed set by the VMIN pin. When the VMIN voltage is higher than the lowest speed setting voltage allowed (The lowest speed voltage is about 0.28V CC), the fan speed is maintained at the lowest speed. Adjust the minimum speed vs. input duty to approximately match the target specification via R2 (R1=15kΩ). Measure the fan rotating speed and the input duty, as shown below. 100 80 Output Duty Cycle (%) NEW PRODUCT 80 60 40 20 0 0 1 2 3 4 5 6 7 8 9 10 R2 (K) Output PWM Duty vs. R2 AM4964 Document number: DS37241 Rev. 2 - 2 10 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Functional Descriptions (cont.) CT – Locked Rotor Timing Capacitor NEW PRODUCT The CT pin will have a capacitor connected to ground. It is a multi-function pin providing timing for the lock detect and auto-restart. Different rates of charge and discharge of CT capacitor depending on the mode of operation (fan operation status) give the lock-detect time (tLCKDET) and lock time (tOFF) before the next auto-start retry. When the motor is running, the capacitor is discharged at every Hall signal change. CT pin provides the timing for the Locked Rotor monitor. In normal operation, Lock Detect is enabled. If the Hall signal does not change (i.e. a rotor lock condition) within the Lock Detect time (tLCKDET), the outputs are disabled. In this condition the motor will not be driven for a set time tOFF. This tOFF time depends on the external CT capacitor value and its internal discharge current (I DHG). After the tOFF period device enters auto-restart phase to re-start the motor with a new Lock Detect time. If the motor has not turned to generate a transition on the Hall inputs by the end of this tLCKDET period, the motor re-enters motor lock tOFF period with the outputs disabled. If the Hall signal change is detected, the motor is deemed as running and goes into lock-detection mode. The tLCKDET and tOFF are determined by the value of the external capacitor on the CT pin and the internal charge and discharge currents during these time periods. The currents during tLCKDET and tOFF are ICHG, and IDHG respectively. FG – Frequency Generator (Tachometer) Output Pin This is the Frequency Generator output and is a buffered signal from the Hall sensor. This is an open collector drive giving an active pull down with the high level being provided by an external pull up resistor. OUT1 and OUT2 Pins OUT1 and OUT2 pins provide H bridge driver output for fan and motor coil connection. VCC – IC Supply voltage This pin provides the supply for the device. GND – Supply Return This is the device supply ground return pin for control signal. PGND –Power Supply Return This is the device supply ground return pin for power output pins OUT1 and OUT2 and will generally be the most negative supply pin to the fan. AM4964 Document number: DS37241 Rev. 2 - 2 11 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Performance Characteristics Quiescent Current vs. Supply Voltage Quiescent Current vs. Ambient Temperature 20 20 Quiescent Current (mA) Quiescent Current (mA) 16 12 8 VCC=12V IQ1 (VCT=L) IQ2 (VCT=H) 16 12 8 4 4 0 0 0 5 10 15 20 25 -50 0 50 100 o Ambient Temperature ( C) Supply Voltage (V) Output Saturation Voltage vs. Ouput Current Allowable Power Dissipation vs. Allowable Temperature (Note 6) 1.2 3.0 o VCC=12V, TA=25 C VSATH VSATL 2.5 Allowable Power Dissipation (W) Output Saturation Voltage (V) NEW PRODUCT o TA=25 C IQ1(VCT=L) IQ2(VCT=H) 2.0 1.5 1.0 0.5 1.0 0.8 0.6 0.4 0.2 0.0 0 100 200 300 400 500 0.0 -20 0 20 40 60 80 90 100 o Ambient Temperature ( C) Output Current (mA) Note 6: TSSOP-20EP exposed pad is soldered to minimum recommended landing pads (see Package Outline Dimension section) on a4.0mmx3.0mm two-layer 2oz.copper FR4 PCB (1.6mm thickness) with four thermal vias in the exposed PAD to the copper flood on the bottom layer. AM4964 Document number: DS37241 Rev. 2 - 2 12 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Applications Note Typical application circuit for PWM input signal for speed control with AM4964 is shown below. The speed is primarily controlled by a voltage on the CF pin (either from DC voltage signal or PWM inputs signal converted to DC voltage). NC 20 PGND OUT1 19 3 OUT2 TA 18 4 VCC TH 17 SGND 16 1 NC 2 D2 VCC D1 note7 V+ C1 1F R1 R2 R3 5 VMIN 6 PWM 7 R4 8 C3 1F 9 RT 10 CF AM4964 NEW PRODUCT L1 D3 R7 R9 V+ CT C2 0.47F 15 RADJ 14 IN- 13 HB 12 IN+ 11 FG R5 R6 Hall RT TL R8 Typical Application Circuit (External PWM Input Speed Control) Note 7: C1 is for power stabilization and should be 1μF or higher depending on the motor current and motor design. AM4964 Document number: DS37241 Rev. 2 - 2 13 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Applications Note (cont.) Some of typical application performance curves based on circuits above are shown below (R1 to R6 open, R8=8kΩ, R9=150kΩ). 60 R7=390K 80 Output Duty (%) Output Duty Gap(%) 40 Low Temperature High Temperature 60 40 Low Temperature High Temperature 20 20 0 0 0 20 40 60 80 0 100 20 40 60 80 100 Input Duty (%) Input Duty (%) Output PWM Duty vs. Input PWM Duty with R7 (180k) Output PWM Duty vs. Input PWM Duty with R7 (390k) TH R5=470K , R7=150K , R8=8.52K , R9=130K 100 Input Duty 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 80 Output Duty (%) NEW PRODUCT Output Duty Gap (Input Duty=100%) R7=180k 80 Output Duty Gap (Input Duty=100%) 100 100 60 TL 40 20 0 24 26 28 30 32 34 36 38 40 42 44 46 o Temperature ( C) Output PWM Duty vs. Temperature AM4964 Document number: DS37241 Rev. 2 - 2 14 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Applications Note (cont.) Power Supply Stabilization The recommended operating voltage range for AM4964 is 3.5V to 16V. A decoupling capacitor C1 (which also acts as re-circulating capacitor at commutation) should be connected close to the VCC pin. C1 is for power stabilization and should be 1μF or higher depending on the motor current and motor design. The HB pin provides a 1.25V Hall bias voltage to drive Hall element. The output of the Hall elements or the Hall switches is connected to Hall input IN+ and IN- pin as described previously in functional description section. To avoid noise, the connection to the Hall element or switch should be as short as possible. The Hall input stage (IN+ and IN- pin) has a hysteresis of 20mV typical. The differential Hall input signal should be 50mV peak or higher. Speed Control The motor speed is governed by the output PWM duty of the H Bridge. Speed Control The motor speed is governed by the output PWM duty of the H Bridge. M NEW PRODUCT Hall Bias and Hall Input for Commutation Signal The voltage on the CF, VMIN pin and the internal triangle wave voltage controls the output PWM duty and therefore the speed of the motor. When the CF voltage is smaller than VMIN voltage, the output PWM duty is generated by comparing the triangular voltage with CF. If the CF pin voltage is higher than the VMIN pin, the speed is controlled by comparing the triangular voltage with VMIN voltage. When the PWM voltage is lower than the low side of the triangular voltage, the motor will run at full speed. See “Speed Control and Minimum Speed Setting” figure. An input DC voltage from 3.6V to 1.9V (for 12V supply) on the CF pin controls the output PWM duty from 0% to 100% thus allowing speed control from 0% to 100% of the full speed. The DC voltage of CF can be adjusted by PWM input signal duty and the ambient temperature sensed by the thermistor (resistive sensor) connected to RT pin. AM4964 Document number: DS37241 Rev. 2 - 2 15 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Applications Note (cont.) Adjustable Voltage fPWM=25kHz VH=3.6V VMIN NEW PRODUCT VCF (T≤TL) VL=2.0V VCF (T≥TH) Low Speed PWM Variable High Speed FG Output(T≤TL) FG Output(T≥TH) All Parameters Are Tested under VCC=12V Speed Control and Minimum Speed Setting Minimum Speed Setting The minimum speed setting prevents the motor speed dropping below a setting speed when the speed demand is too low (i.e. PWM voltage is closer to 3.6V) When the CF pin voltage is higher than the VMIN voltage, the VMIN voltage is compared with the internal triangular wave to generate the output PWM duty. Therefore, setting the VMIN to certain fixed voltage forces the VMIN to control the speed even when the CF voltage is higher. If VMIN setting is not used or application does not need to set the minimum speed, connect the VMIN to CF directly. Rotor Lock Detect and OFF Tme Setting The capacitor C4 from CT pin to the ground provides the timing for the lock detect and auto-restart. The capacitor C4 is charges and discharged by the CT pin at a fixed rate depending on the mode of operation (fan operation status) and therefore the value of the C4 to gives lock-detect time (TLCKDET) and lock time (TOFF) before next auto-start retry. The AM4964 returns the C4 voltage to the low threshold, VCTL (1.77V), each time the Hall sensor provides the commutation signal. C4 is charged with ICHG which is typically 2μA. If the voltage on the C4 reaches the high threshold, V CTH (3.7V) before the next Hall signal change, the output will be shut down and the device will enter lock condition. CTH C DET CT CHG The thresholds voltage and charge current are fixed, therefore the tLCKDET time depends only on the value of C4. C DET For C4 of 0.47μF, tLCKDET is 0.47s. AM4964 Document number: DS37241 Rev. 2 - 2 16 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Applications Note (cont.) If lock detection causes device to enter output shutdown, the CT pin will discharge the C4 capacitor with I DHG provide tOFF period. The tOFF is the time the device waits before next auto-restart. During tOFF period, the C4 is discharged for the high threshold, V CTH to low threshold VCTL at the discharge current IDHG which is typically 0.2μA. CTH OFF CT CHG NEW PRODUCT The thresholds voltage and discharge current are fixed, therefore the tOFF time depends only on the value of C4. OFF For CT of 0.4μs, tOFF is 4.7s before the next auto restart. Thermal Shutdown AM4964 includes a thermal shutdown function. When the device junction temperature is higher than +176ºC typical, the thermal shutdown function is triggered and the low side output transistors in H bridge driver will be turned off. When the IC junction temperature drops below +148ºC typical, the device will recover. Status Output - FG Output The FG output pin is an open collector output which switches ON (pulled low) and OFF (pulled high with an external resistor) depending on the magnetic phase of the motor. The external pull up resistor should be connected to the FG pin. The FG pin has series resistors of 25Ω typical integrated in the FG output structure to increased robustness against reverse supply connection of the FG to ground. The typical value for external pull-up on FG is 10k. AM4964 Document number: DS37241 Rev. 2 - 2 17 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Ordering Information AM4964 X XX – XX NEW PRODUCT Product Name Package Packing RoHS/Green G : TSSOP-20EP TR : Tape & Reel G1 : Green Diodes IC’s Pb-free products with "G1" suffix in the part number, are RoHS compliant and green. Package Temperature Range TSSOP-20EP -30 to +90C Part Number AM4964GTR-G1 Marking ID AM4964GG Packing 4000/Tape & Reel Marking Information (Top View) AM4964 GG YWWAXX AM4964 Document number: DS37241 Rev. 2 - 2 First and Second lines: Logo and Marking ID Third Line: Date Code Y: Year 0 to 9 WW: Week 00 to 52 (Work Week of Molding) A: Assembly House Code th th XX: 7 and 8 Digits: Batch No. Part Number Package Marking ID AM4964GTR-G1 TSSOP-20EP AM4964GG 18 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Package Outline Dimensions (All dimensions in mm(inch).) (1) Package Type: TSSOP-20EP 4.100(0.161) 4.300(0.169) 2.900(0.114) 3.100(0.122) 6.200(0.244) 6.600(0.260) EXPOSED PAD 4.300(0.169) 4.500(0.177) 0.000(0.000) 0.750(0.030) INDEXФ 0.850(0.033) Dp 0.100(0.004) #1 PIN NEW PRODUCT 6.400(0.252) 6.600(0.260) 0.100(0.004) 0.190(0.007) 0.650(0.026)TYP 0.800(0.031) 1.050(0.041) 0.340(0.013) 0.540(0.021) 4-10° 14° TOP & BOTTOM 0.200(0.008)MIN R0.090(0.004)MIN 1.200(0.047) MAX 0.050(0.002) R0.090(0.004)MIN 0.150(0.006) 0.250(0.010)TYP 0° 8° 0.200(0.008) 0.280(0.011) 0.450(0.018) 0.750(0.030) 1.000(0.039) REF Note: Eject hole, oriented hole and mold mark is optional. AM4964 Document number: DS37241 Rev. 2 - 2 19 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 Suggested Pad Layout (1) Package Type: TSSOP-20EP NEW PRODUCT X1 G Y1 Z Y E X Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) Value 7.720/0.304 4.160/0.164 0.420/0.017 1.780/0.070 Dimensions E (mm)/(inch) X1 (mm)/(inch) Y1 (mm)/(inch) – Value 0.650/0.026 4.500/0.177 3.300/0.130 – AM4964 Document number: DS37241 Rev. 2 - 2 20 of 21 www.diodes.com June 2014 © Diodes Incorporated A Product Line of Diodes Incorporated AM4964 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). 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LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components 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 properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result 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 the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systemsrelated information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2014, Diodes Incorporated www.diodes.com AM4964 Document number: DS37241 Rev. 2 - 2 21 of 21 www.diodes.com June 2014 © Diodes Incorporated