ZXBM1021

ZXBM1021

Document overview

• Manufacturer or author: Diodes Incorporated
• PDF pages: 25

Technical content

Features

 Operating Voltage: 6.8V to 18V  Can be Extended with External Regulator  Speed Control via External PWM, DC or Thermistor Signals  Low Noise, High Efficiency  Soft Start  Integrated Current Control  Reference Voltage Output  Built-in Hall Amplifier for Direct Connection of Hall Element  Rotor Lock Protection  Lock Detection, Output Shutdown and Automatic Restart  Minimum Speed Setting  Frequency Generator (FG) Output  Thermally Enhanced Space Saving Low Profile U-QFN4040-20 and Industry Standard QSOP-20 Packages  Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)  Halogen and Antimony Free. “Green” Device (Note 3)  For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/ Pin Assignments U-QFN4040-20 VCC ThRef PWMSPD CSPD CLCK Ph2Hi SPD SMIN FG Ph1Lo Ph2Lo Ph1Hi SetThRef Sense SetTh GND V+OP HBIAS ZXBM1021 Top View QSOP-20 SetThRef SPD GND Ph1Lo Ph2Lo CSPD CLCK FG ThRef SMIN Ph1Hi Ph2Hi Sense SetTh V+OPVcc PWMSPD 10 11 HBIAS ZXBM1021 Top View

Applications

 Personal, servers and mainframe computers cooling fans  Instrumentation and equipment cooling fans  Home appliance fans and blowers  Central heating blowers and extraction systems  Industrial fans, blowers and extractors  Hand dryers  Hand-held power tools  Pumps Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ 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. NOT RECOMMENDED FOR NEW DESIGN CONTACT US

Document number: DS36322 Rev. 3 - 3 2 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Typical Applications Circuit (Note 4) ZXBM1021 VCC CLCK SPD 1µF 0.1uF 0.47µF FG Typical Applications Circuit for PWM Control using the ZXBM1021 and ZXMC MOSFET 1/2 Bridge Drivers ThRef SMIN Ph1Lo Ph2Lo GND Q1-4 470Ω 470Ω DIODES™ ZXMC 3A17DN8 FG Ph1Hi Ph2Hi R4R6 100Ω 100Ω 1kΩ 1kΩ 2.2µF 12V 1N4148 1N4004 SetTh Sense PWM control R10 16kΩ 12kΩ Hall 470Ω 33kΩ Rsense 0.1Ω 3 3 4 4 5 & 6 5 & 6 7 & 8 7 & 8 2 2 1 1 SetThRefPWMSPD CSPD 0.1µF V+OP HBIAS R12 (Optional) ZXBM1021 VCC CLCK SPD 1µF 0.1uF 0.47µF FG Typical Applications Circuit for DC Control using the ZXBM1021 and ZXMC MOSFET 1/2 Bridge Drivers ThRef SMIN Ph1Lo Ph2Lo Gnd Q1-4 470Ω 470Ω ZXMC 3A17DN8 FG Ph1Hi Ph2Hi R4R6 100Ω 100Ω 1kΩ 1kΩ 2.2µF 12V D1 1N4148 1N4004 SetTh Sense R10 16kΩ 12kΩ Hall 470Ω 33kΩ Rsense 0.1Ω 3 3 4 4 5 & 6 5 & 6 7 & 8 7 & 8 2 2 1 1 SetThRefPWMSPD CSPD 0.1µF V+OP HBIAS DC control R11 10kΩ R12 (Optional) Note: 4. FG pull-up resistor is not shown in the typical application circuit. Generally, the FG pull-up resistor is located at the system host end rather than the fan motor PCB.

Document number: DS36322 Rev. 3 - 3 3 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Pin Descriptions Pin Number Pin Name Description U-QFN4040-20 QSOP-20 1 4 HBIAS Hall Bias Supply Voltage Output Pin. Output voltage is 1.75V typical to supply the external un- buffered (‘naked’) Hall element. A resistance can be added in series with Hall element if lower bias voltage is needed. 2 5 ThRef 5V Reference Voltage Output Pin. This voltage is used to supply the external networks. 3 6 PWMSPD Speed Control PWM Signal Input Pin. PWM signal should be between 0% to 100% duty ratio. 4 7 SPD DC Voltage Speed Control Input Pin. The control signal voltage should be between 3V for 0% (stop) to 1V for 100% (full speed) speed control. In DC voltage mode, connect a capacitor between SPD and ground. 5 8 CSPD Output Pin of the PWM Speed Control Input Signal Integrator. In PWM speed control mode, connect a 0.1µF capacitor from CSPD pin to ground and connect CSPD pin to SPD pin. In DC voltage speed control mode, leave this pin unconnected. 6 9 SMIN Minimum Speed Setting Pin. Voltage between 3V to 1V on this pin sets the minimum speed the motor runs at between 0% to full speed. The lowest minimum speed achieved depends on the motor coil design. 7 10 CLCK Rotor Lock Detect, Auto Restart Timing and Soft-Start Timing Control Pin. Typically a 470nF capacitor is connected to this pin to set the soft-start (to full speed), lock detect and restart timings. 8 11 GND Supply Return Ground Pin 9 12 FG Frequency Generator Output to Provide a Tachometer Signal. This is a buffered output from the Hall amplifier. 10 13 SetTh Current Sense Threshold Setting Pin. Used to set the threshold voltage that represents the maximum current to be taken by the motor. The current sense voltage at Sense pin is compared to the SetTh voltage. 11 14 Sense Current Sense Pin. Input for the signal from a sense resistor in the ground return of the H-bridge circuit to represent the current taken by the motor. 12 15 SetThRef A variable voltage source used to set the voltage on the SetTh pin. 13 16 Ph1Hi Phase 1 High-Side External Power Switch Drive Output Pin. This is a 50mA open-collector output. 14 17 Ph2Hi Phase 2 High-Side External Power Switch Drive Output Pin. This is a 50mA open-collector output. 15 18 Ph2Lo Phase 2 Low-Side External Power Switch Drive Output Pin. Darlington emitter follower output with active pull down to give source/sink current of 100mA/100mA. 16 19 Ph1Lo Phase 1 Low-Side External Power Switch Drive Output Pin. Darlington emitter follower output with active pull down to give source/sink current of 100mA/100mA. 17 20 V+OP Phase Low Output Supply Pin. Only the low side output drives for Ph1Lo and Ph2Lo are supplied by the V+OP pin. For external MOSFET power devices, a resistor from VCC pin to V+OP slows down the turn-on speed of the low-side MOSFETs and therefore helps prevent shoot-through during turn-on of low-side switches. For external Bipolar power devices, a resistor between the VCC pin and V+OP controls the current into the transistor base. 18 1 VCC Power Supply Pin 19 2 H+ Hall Device Positive Input Pin. When H+ is higher in relation to H-, Ph2 is active. 20 3 H- Hall Device Negative Input Pin.

Document number: DS36322 Rev. 3 - 3 4 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Functional Block Diagram (Note 5) Speed & Lock Detect Hall FG CLCK SPD Hall Amp PWM Integrator Locked Rotor Detect Phase Drive & Control GND Vcc Set Min Speed Vref SMIN ThRef Ph2Lo Ph1Lo Ph2Hi Ph1Hi Vcc Vcc Phase Drive Current Monitor SetTh Sense Voltage Speed Control VSPD Vcc Vcc Hall Bias HBIAS Start-up SetThRef PWMSPD PWM speed control PWMSPD CSPD RD V+OP PWM Osc Note: 5. The ZXBM1021 has an open-collector FG. Typically a pull-up resistor of 10kΩ is recommended from FG pin to the supply voltage.

Document number: DS36322 Rev. 3 - 3 5 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Absolute Maximum Ratings (Note 6) (@TA = +25°C, unless otherwise specified.) Symbol Characteristics Values Unit VCCMAX Supply Voltage (Note 7) -0.6 to 20 V ICCMAX IC Input Current 200 mA PDMAX Power Dissipation (See thermal de-rating curve on ‘Thermal Performance’ section) U-QFN4040-20 820 mW QSOP-20 820 mW TST Storage Temperature Range -55 to +150 °C TJ Maximum Junction Temperature +150 °C ESD HBM Human Body Model (HBM) ESD Capability 2 kV ESD MM Machine Model (MM) ESD Protection 300 V Notes: 6. Stresses greater than those listed under Absolute Maximum Ratings can 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 can affect device reliability. 7. The absolute maximum VCC of 20V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to operate the device at the absolute maximum rated conditions for any period of t ime. Recommended Operating Conditions Symbol Characteristic Conditions Min Max Unit VCC Supply Voltage Operating, -40°C to +110°C 6.8 18.0 V TA Operating Temperature Range Operating -40 +110 °C Electrical Characteristics (@TA = +25°C, VDD = 12V, unless otherwise specified.) Symbol Characteristics Conditions Min Typ Max Unit ICC Supply Current No Load (Note 8) — 10 15 mA Hall Connections VIN Hall Amplifier Input Voltage Diff Peak to Peak 40 — — mV VCM Hall Amplifier Common Mode Voltage — 0.5 — VThRef V VHYS Hall Amplifier Input Hysteresis — — ±12 — mV IBS Hall Amplifier Bias Current — — 700 1000 nA VHB Hall Bias Voltage IHB = 10mA 1.5 1.75 1.95 V IHB Hall Bias Output Current Capability — — — 10 mA Reference Voltage VThRef ThRef Reference Output Voltage IOThRef = 10mA, +25°C 4.85 5 5.15 V IOThRef = 10mA, -40°C to +110°C 4.75 5 5.25 V IOThRef ThRef Output Current Capability — — — 10 mA PWM Oscillator fPWM PWM Frequency — 18 25 — kHz DC Voltage Speed Control VSPDL SPD Voltage Minimum 100% PWM Drive — 1 — V VSPDH SPD Voltage Maximum 0% PWM Drive — 3 — V ISPD SPD Pin Current at Speed Demand of 50% of the Full Speed and Without Minimum Speed Setting VSPD = 2V SMIN = 0V — 0.5 2 µA ISPD_SMIN2V SPD Pin Current with Minimum Speed Setting of 50% of the Full Speed VSPD = 3V RSPD = 10kΩ SMIN = 2V — 100 — µA LinSPD SPD Pin Voltage to Output PWM Linearity VSPD = 2V — — 3 % Note: 8. Measured with pins H+, H-, CLCK and CPWM, and all other signal pins open circuit.

Document number: DS36322 Rev. 3 - 3 6 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Electrical Characteristics (continued) (@TA = +25°C, VDD = 12V, unless otherwise specified.) Symbol Characteristics Conditions Min Typ Max Unit PWM Speed Control VPWMSPDH PWMSPD High Level — 2 — VCC V VPWMSPDL PWMSPD Low Level — — — 0.4 V IPWMSPD PWMSPD High Level Input Current — — 0.8 2 µA DPWMSPD PWM Speed Signal Duty Range — 0 — 100 % fPWM_MAX Maximum Frequency of PWM Control Signal — — — 100 kHz LinINT PWMSPD Pin PWM Duty Ratio to CSPD Output Voltage Linearity PWMSPD Duty Ratio 50% PWM Frequency fPWM = 25kHz 1.94 2 2.06 V Minimum Speed Setting ISMIN SMIN Input Current VSMIN = 2V — -0.25 -0.5 µA Soft Start tSS Soft-Start Time to Full Speed CLCK = 0.47µF — 3 — s Lock Timing — Lock Condition tLCKDET: tOFF Ratio — — 1:8 — — ILCKCL CLCK Charge Current – Soft Start (From Lock) and in Lock Mode Lock Mode VCLCK = 2.5V 0.45 0.7 1.07 µA ILCKCR CLCK Charge Current – Run Run Mode 3.25 5.5 9.0 µA ILCKDL CLCK Discharge Current - Lock Lock Mode VCLCK = 2.5V 0.45 0.7 1.07 µA VCLCKTHH CLCK High Threshold Voltage — — 5 — V VCLCKTHL CLCK Low Threshold Voltage Lock Mode — 0.6 — V Current Limit VSetThRef SetThRef Output Voltage ISetThRef = 200µA ThRef- 0.17 ThRef- 0.1V ThRef- 0.05 V ISetThRef SetThRef Output Current — — — -200 µA ISENSE Sense Input Current — — -20 -100 nA ISetTh SetTh Input Current — — -20 -100 nA Output Drives VOH Ph1Lo and Ph2Lo Output High Voltage IOH = 100mA VCC - 2.2 VCC - 1.7 — V VOLA Ph1Lo and Ph2Lo Output Low Voltage IOL = 100mA (Note 9) — 0.3 0.5 V VOLB Ph1Lo and Ph2Lo Output Low Voltage IOH = 50µA (Note 10) — 0.3 0.5 V IOH Ph1Lo and Ph2Lo Output Source Current — — — 100 mA IOL Ph1Lo and Ph2Lo Output Sink Current — — — 100 mA VOLA Ph1Hi and Ph2Hi Output Low Voltage IOH = 50mA (Note 10) — 0.3 0.5 V IOL Ph1Hi and Ph2Hi Output Sink Current — — — 50 mA IOFF Ph1Hi and Ph2Hi Off Output Leakage Current — — — ±100 nA tCD Commutation Delay — 20 70 — µs Output Flags IFGOL FG Low Level Output Current Capability — — — 10 mA VFGOL FG Low Level Output Voltage IFGOL = 10mA — — 0.4 V Lock Conditions tLCKDET Lock Detect Time (time it waits for before next Hall signal before deciding to turn outputs off for fixed time) CLCK = 0.47µF ILCKCR = 5.5µA — 400 — ms tOFF Output Off Time after Lock is Detected CLCK = 0.47µF — 3 — s Notes: 9. Measured when opposing Phase Output is Low. 10. Measured when opposing Phase Output is High.

Document number: DS36322 Rev. 3 - 3 7 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Functional Descriptions HBIAS – Hall Bias Output This is a 1.75V 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 HBIAS pin and the Hall element supply pin. H+ and H- – Hall Inputs The rotor position is detected by a Hall sensor, with the output applied to the H+ and H- pins. This sensor can be either a 4 pin 'naked' Hall device or the 3 pin buffered switching type. For a 4 pin device , the differential Hall output signal is connected to the H+ and H - pins. For a buffered Hall sensor, the Hall device output is attached to the H+ pin, with a pull -up attached if needed, whilst the H - pin has an external potential divider attached to hold the pin at half VThRef. When H+ is high in relation to H-, Ph2 is the active drive. ThRef – Output Reference Voltage This is a 5V nominal reference output voltage. It is designed to 'source' current and therefore it will not 'sink' any current from a higher voltage. The total current drawn from the ThRef pin by any external circuitry, such as the minimum speed potential divider to SMIN pin, should not exceed 10mA. SPD – Speed Control DC Voltage Input The voltage applied to the SPD pin provides control over the fan motor speed by varying the Pulse Width Modulated (PWM) drive ratio at the Ph1Lo and Ph2Lo outputs. The control signal takes the form of a variable DC voltage input of range 3V to 1V, repre senting 0% to 100% drive respectively. If variable speed control is not required , this pin can be tied to an external potential divider to set a fixed speed or tied to ground to provide full speed i.e. 100% PWM drive. If required, this pin can also be u sed as an enable pin. The application of a voltage >3.0V on this pin will force the PWM drive fully off, in effect disabling the drive, providing the minimum speed function is not active (See SMIN pin section below). To use a minimum speed setting or curr ent control in DC voltage speed control mode, add a series resistor 10k Ω or greater (R11 in typical application circuit for DC control in page 2) between speed control DC voltage input source and SPD pin. PWMSPD – Speed Control PWM Signal Input The duty ratio of the speed control PWM signal input to this pin controls the f an motor speed by varying the output drive PWM ratio at the Ph1Lo and Ph2Lo outputs. In the PWM speed control mode, the PWMSPD pin and the CSPD pin work together to control the speed. The PWM signal input on the PWMSPD pin is integrated by the capacitor on the CSPD pin (See CSPD pin description). PWM control input signal to the PWMSPD pin needs to be a TTL logic levels. CSPD – PWM Speed Control Signal Integrator Output When PWM input signal is used to control the motor speed, PWM signal is integrated to DC voltage between 1V to 3V for speed control. If PWMSPD pin input is TTL low, the output voltage on C SPD is 3V and if PWMSPD pin is TTL high, the C SPD pin output is at 1V. In order for the integrator function to be fulfilled , an external capacitor is requir ed. This would normally be a 0.1 µF capacitor for a 25kHz input PWM frequency applied to the PWMSPD input. In PWM speed control mode, connect 0.1 µF capacitor from C SPD pin to ground and connect C SPD pin to SPD pin. When in DC voltage speed control mode, keep PWMSPD and CSPD pins unconnected. SMIN – Minimum Speed Setting A voltage can be set on this pin via a potential divider between the ThRef and GND pins. This voltage is monitored by the SPD pin to clamp the SPD control voltage so that it does not rise above SMIN voltage. As a higher voltage on the SPD pin represents a lower speed, the S MIN setting prevents the motor speed from going lower than the minimum speed set by the S MIN pin. If this feature is not required, the pin is left tied to ThRef so no minimum speed will be set. If the fan is being controlled from an external voltage source onto the SPD pin, then either this feature should not be used or if the minimum speed setting is required then a 10kΩ or greater resistor should be placed in series with the SPD pin.

Document number: DS36322 Rev. 3 - 3 8 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Functional Descriptions (continued) CLCK – Locked Rotor Timing Capacitor The CLCK pin will have a capacitor connected to ground. It is a multi -function pin providing timing for the lock detect, auto-restart and soft -start conditions. Different rates of charge and discharge of CLCK capacitor depending on the mode of operation (fan operation status) give the soft-start (tSS) to full speed , lock -detect time ( tLCKDET) and lock time ( tOFF) before next auto -start retry. When the motor is run ning, the capacitor is discharged at every Hall signal change. CLCK pin provides the timing for the Locked Rotor monitor. In normal operation, and after the soft -start period, Lock Detect is enabled. If the Hall signal does not change (i.e. a rotor lock c ondition) 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 C LCK capacitor value and its internal discharge current (I LCKDL). After the tOFF period, device goes into a soft-start period (tSS) to re-start the motor. If the motor has not turned to generate a transition on the Hall inputs by the end of this period, motor re -enters motor lock tOFF period with outputs disabled. Once the fan is running normally at the end of a soft -start period, the motor is deemed as running and goes into lock-detection mode. The time periods of tSS, tLCKDET and tOFF are determined by the value of the external capacitor on the C LCK pin and the internal charg e and discharge currents during these time periods. The currents during tSS, tLCKDET and tOFF are ILCKCL, ILCKCR and ILCKDL respectively. During soft-start mode, the SetThRef voltage is increased from 0 to Vref. A potential divider from SetThRef is used t o generate SetTh voltage for current limit. As SetThRef ramps to nominal value, current limit set also ramps from 0 to nominal setting. This gradual release of current limit to full speed level provides the soft-start. FG – Frequency Generator (Tachometer) Output 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. tLCKDET tOFF tss Hall CLCK FG VTHH VTHL FG Timing Diagram

Document number: DS36322 Rev. 3 - 3 9 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Functional Descriptions (continued) Sense – Current Control Sense This pin is used by the current sensing circuit to monitor the current taken by the motor windings. The signal comes from a s ense resistor in the low-side ground return of the external H-bridge driver. SetTh – Current Control Threshold Voltage This pin is used by the current sensing circuit as the reference voltage for the voltage on the sense pin to be compared agai nst. If the voltage on the sense pin starts t o exceed the voltage set on this pin , the current control circuitry starts to back off the output drive PWM duty , thus reducing the current being supplied to the motor coil. SetThRef – SetTh and Start-up Reference This pin is derived from an internal star t-up circuit and is used as the source voltage for the potential divider network attached to the SetTh pin. Under running conditions, this voltage will be typically ThRef-0.1V. However, during start up, the voltage ramps up from 0V to ThRef-0.1V at a rate determined by the capacitor on the CLCK pin giving a gradual release of current limit from 0 to nominal setting. ThRef-0.1V is equal to 4.9V typical. This low power pin is capable of supplying a maximum of 200 µA. It should only be used to supply the poten tial divider network attached to the SetTh pin. Ph1Lo and Ph2Lo – Low-Side External H-Bridge Drive Output Ph1Lo and Ph2Lo outputs drive the low side of the external power device H -bridge that in turn drives the single phase winding. These outputs provide both the commutation and PWM waveforms. The outputs are active pull -up and active pull-down to help faster switching off when driving MOSFET devices with a high gate capacitance. When in the high state , the outputs will provide up to 100mA of drive into th e base or gates of external transistors as shown in the typical application circuit shown on the front page. When in the low state, the active phase drive is again capable of sinking up to 100mA to aid turn off times during PWM operation. When the phase is inactive, the output is held low by a 7.5kΩ internal pull-down resistor. Ph1Hi and Ph2Hi – High-Side External H-Bridge Driver Ph1Hi and Ph2Hi are the high side outputs to the external H -bridge and are open collector outputs capable of sinking 50mA. This signal provides commutation only to the H-bridge. V+OP – Phase Outputs Supply Voltage This pin is the supply to the Phase outputs Ph1Lo and Ph2Lo only. This pin can be connected to VCC pin directly or through a resistor. For external Bipolar power devices, the resistor on V+OP is used to control the current into the transistor base and its value is chosen accordingly. For external MOSFET power devices, the pin can be used to slow down the turn -on speed of the low -side MOSFETs. Slowing down the turn-on speed of low side switches helps to prevent pa rasitic turn -on of the high -side switches and thus help s to prevent shoot -through during turn -on of low -side switches. The gate resistor connected at Ph1Lo and Ph2Lo plus the resistor on V+OP controls the turn on speed of the MOSFET. The turn-off of speed of the MOSFETs is controlled by the gate resistor only. VCC – IC Supply Voltage This provides the supply for the device's internal circuitry except Ph1Lo and Ph2Lo output stages, which are supplied from the V+OP pin. For 12V fans, this can be supplied directly from the Fan Motor supply. For fans likely to run in excess of the 18V maximum rating for the device , this will be supplied from an external regulator such as a Zener diode or low drop out regulator. GND – Supply Return This is the device supply ground return pin and will generally be the most negative supply pin to the fan.

Document number: DS36322 Rev. 3 - 3 10 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Typical Operating Characteristics 4.50 4.60 4.70 4.80 4.90 5.00 5.10 5.20 5.30 5.40 5.50 -50 -25 0 25 50 75 100 125 ThRef (V) Ambient operating temperature TA ( C) ThRef vs Ambient Temperature 6V8 12V 18V

Document number: DS36322 Rev. 3 - 3 11 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021

Application Information

The ZXBM1021 is primarily controlled by a voltage on the SPD pin or a PWM signal on the PWMSPD pin. A voltage of 1V represents a 100% PWM at the Phase Outputs and in turn represents full speed. 3V on the SPD pin conversely re presents 0% PWM. The motor can therefore be controlled simply by applying a control voltage onto the SPD pin with the minimal use of external components. This voltage control method easily lends itself to control by other signal types. For example if a thermistor is applied to t he SPD pin , a varying voltage can be generated at the SPD pin as the resistance of the thermistor varies with temperature. A common form of control of fans is by a PWM signal derived from a central processor or controller. This speed control PWM signal can be applied to PWMSPD pin. Motor speed is proportional to the duty ratio of the applied PWM speed control signal on PWMSPD pin. Voltage on the SMIN pin sets the minimum speed of the motor. If the speed demand by either DC signal on SPD pin or PWM signal on PWMSPD pin is lower than the minimum speed setting, motor will run at minimum speed. The design of a motor system will be set around the maximum speed, the minimum speed and the current of the motor. The design of the motor coil and the voltage on the output stage will set the maximum speed of the motor. The ZXBM1021 allows easy setting and control of the minimum speed and maximum motor current, as well as for controlling the speed. DC Speed Control The SPD pin will respond to an input DC voltage from 3V to 1V for 0% to 100% of the full speed. To allow internal minimum spe ed setting (SMIN) and current control (ILIM) circuits to adjust the SPD pin voltage, the speed control DC voltage signal should be driven in via a 10k Ω series resistor. The series resistor allows the SPD pin to vary even when driven externally by a low impedance source . A 0.1µF capacitor should be connected from the SPD pin to supply ground. When used in DC speed control mode, PWMSPD and CSPD pins should be left floating. VCC ThRef PWMSPD CSPD CLCK Ph2Hi SPD SMIN FG Ph1Lo Ph2Lo Ph1Hi SetThRef Sense SetTh GND HBIAS ZXBM1021 6 7 8 9 10 20 19 18 17 16 V+OP 0.1µF DC Speed Control (3V to 1V) R 10kΩ C

Document number: DS36322 Rev. 3 - 3 12 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Application Information (continued) This input also allows the fan to be driven by a ther mistor, to allow the speed to be controlled according to temperature. An example circuit is shown below. With the values shown, and a Beta value of 4000 for the NTC, the above circuit drives the ZXBM1021 with 3V (minimum speed) at 0°C , changing to 1V (maximum speed) at +82°C, subject to tolerances. To minimize additional circuitry, the 5V ThRef output from the ZXBM1021 IC can supply the current required for the thermistor network circuit as long as the total current from ThRef does not exceed 10mA. PWM Speed Control An additional input allows for the use of PWM to control the fan speed. The ZXBM1021’s output speed is proportional to the duty cycle of the PWM input. When using PWMSPD speed input, the SPD pin should be connected to C SPD with a 0.1µF capacitor connected to ground. PWMSPD can be driven from a microcontroller with either 0-5V or 0-3.3V logic levels signal. The recommended frequency of the input PWM control signal is 25kHz. ThRef PWMSPD Ph2Hi SPD FG Ph1Lo Ph2Lo Ph1Hi SetThRef Sense SetTh GND HBIAS ZXBM1021 6 7 8 9 10 20 19 18 17 16 V+OP 0.1µF R11 10kΩ R12 4.7kΩ R13 9.1kΩ NTC 10kΩ CLCK SMIN CSPD VCC VCC ThRef PWMSPD CSPD CLCK Ph2Hi SPD SMIN FG Ph1Lo Ph2Lo Ph1Hi SetThRef Sense SetTh GND HBIAS ZXBM1021 6 7 8 9 10 20 19 18 17 16 V+OP 0.1µF PWM Speed Control (TTL level, Duty ratio 0% to 100%)

Document number: DS36322 Rev. 3 - 3 13 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Application Information (continued) SMIN Minimum Speed Setting Minimum speed setting prevents the motor from running below a set speed regardless of whether the control applied is for a slower speed (either DC or PWM input). The minimum motor speed is chosen based on a speed below which the motor may or fail to start. The SMIN pin voltage sets a maximum voltage clamp for the SPD pin. For a DC voltage input into SPD pin, the voltage range 3V to 1V represents 0% to 100% of full speed. In order to set a minimum speed of 20%, SMIN should be set 20% into this range below 3V, i.e. 2.6V. Minimum speed is set by the voltage on the SMIN pin, using a potential divider from the ThRef voltage output as shown below. The SMIN voltage is given by SMIN = ThRef ( R10 R9+R10) ThRef PWMSPD Ph2Hi SPD FG Ph1Lo Ph2Lo Ph1Hi SetThRef Sense SetTh GND HBIAS ZXBM1021 6 7 8 9 10 20 19 18 17 16 V+OP CLCK SMIN CSPD VCC 12kΩ R10 13kΩ

Document number: DS36322 Rev. 3 - 3 14 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Application Information (continued) ThRef is capable of driving 10mA, but it is not necessary to draw much current for SMIN. Set R10+R9 in the range 5kΩ-50kΩ (1mA - 100µA). ThRef may also be used to drive a thermistor circuit, so care must be taken to keep the total current drawn from ThRef to the correct level. Example: Required SMIN of 20% = 2.6V SMIN = ThRef ( R10 R9+R10) 2.6V = 5V( R10 R9+R10) Solve for R9 R9 = (2.4 2.6) R10 Choose R10 = 13kΩ and solve for R9 which gives R9 = 12kΩ. The current in R10+R9 string = 5/25000 = 200µA If SMIN is not required, the SMIN pin should be pulled up externally to ThRef by 1kΩ. Motor Current Limit The motor current limit on ZXBM1021 compares the voltage on the Sense pin against the threshold voltage on the SetTh pin. The current limit is triggered when the voltage at the Sense pin exceeds the threshold at SetTh. The device lowers the output PWM drive duty ratio if the voltage on the Sense pin rises above the threshold voltage on the SetTh pin. The threshold value at SetTh pin is set using R7 and R8 between SetThRef, SetTh and GND . The Sense voltage is generated by the motor current flowing through the sense resistor. It is recommended to use 100mΩ for the sense resistor on the Sense pin, and vary the current limit by changing R7 and R8. The current limit, ILIM, is given by ILIM = SetThRef R8 R7 + R8 RSENSE Note that SetThRef has a maximum output current of 200µA, therefore R7+R8 must be larger than 25kΩ. ThRef PWMSPD Ph2Hi SPD FG Ph1Lo Ph2Lo Ph1Hi SetThRef Sense SetTh GND HBIAS ZXBM1021 6 7 8 9 10 20 19 18 17 16 V+OP CLCK SMIN CSPD VCC RsenseRsense Motor coil

Document number: DS36322 Rev. 3 - 3 15 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Application Information (continued) Example: Required ILIM = 2A ILIM = SetThRef R8 R7 + R8 RSENSE where SetThRef = (ThRef -0.1V) = 4.9V typical 2A = 4.9V R8 R7 + R8 0.1Ω Solve for R7 R7 = (4.9 0.2) R8 Choose R8 = 2kΩ and solve for R7 which gives R7 = 47kΩ. The current in R7+R8 string = 4.9/49000 = 100µA which is within maximum output current capability of the SetThRef pin. It is important that the current limit be set above the intended average curr ent of the motor. In practice, due to the variable nature of the motor current through a commutation cycle , it is usually necessary for the current limit to be set higher than the peak current drawn at the beginning of each commutation cycle. The top t race shows the motor coil current, while the l ower trace shows the S ense pin voltage. As the current flow direction in the motor coil changes at each commutation cycle, the motor current in the top trace is shown as positive and negative current. The curre nt flowing in the Rsense is always in the same direction and therefore the sense pin reads the magnitude of the motor coil current. Current limiting may prevent the motor from reaching full speed, despite the average current being significantly lower than the current limit. The system will limit the tail-end current according to the current limit set. Current limit setting can also be used to remove the tail-end current. Example of using current limit to reduce tail-end current at full speed is shown below. Current limit set much higher than the peak tail-end current (Peak tail-end current = 180mA typ, Current limit set at 0.485mA )

Document number: DS36322 Rev. 3 - 3 16 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Application Information (continued) Current limit set lower than the peak tail-end current (Tail-end current = 145mA typ, Current limit set at 0.166mA) CLCK Value The value of CLCK affects three important timings for the ZXBM1021: Soft Start, Lock Detect and Off-time. Soft Start When the system is initially powered on, it will go through the soft -start period, during which the motor is gradually ramped to full speed. The soft start operation relies on the current control feature being implemented and generally the current limit is set slightly above the normal running current. In the soft start process, at power -on the voltage at C LCK will rapidly increase to the low threshold, V CLCKTHL (0.6V). Then, CLCK will be charged from 0.6V up to the high threshold, V CLCKTHH (5V) at a constant current, I LCKCL, which is typically 0.7µA. The time taken to charge the capacitor form VCLCKTHL to VCLCKTHH level depends on the value of CLCK capacitor. The soft-start time tSS is given by: tSS = CLCK (VCLCKTHH − VCLCKTHL) ILCKCL Since VCLCKTHH, VCLCKTHL and ILCKCL are fixed, this becomes simply: tSS = CLCK × 6.29 × 106 For the default value of CLCK, 0.47µF, soft-start time is: This is the 3s stated in the datasheet electrical parameter section. Lock Detect When the motor is running, the Hall sensor will follow the rotor magnetic flux dens ity to detect the commutation point. Should the rotor lock, the signal from the Hall sensor will cease. The value of CLCK defines the lock detect time period before the ZXBM1021 shuts down the outputs in order to prevent damage to the coil. The ZXBM1021 internal system returns C LCK voltage to the low threshold, V CLCKTHL (0.6V), each time the Hall sensor provides a commutation signal. CLCK then charges at the run current, I LCKCR, which is typically 5.5µA. If the voltage on C LCK reaches the high threshold, VCLCKTHH (5V), before the Hall sensor provides the next commutation signal then the system will shut down by entering the lock condition. tLCKDET = CLCK (VCLCKTHH − VCLCKTHL) ILCKCR The thresholds voltage and charge current are fixed, therefore the time depends only on the value of CLCK: tLCKDET = CLCK × 0.8 × 106 For the default value of CLCK, 0.47µF, tLCKDET is as follows: This should not interfere with normal operation of a fan as the time period f or lock detection is many times longer than the expected time for one revolution. As the Hall sensor will detect 4 transitions in a single revolution, 0.376s between transitions would equate to a rotational speed of 40rpm. For use in systems where extremely low rotation speeds are required, the lock detect time can be increased by making the CLCK capacitor value larger.

Document number: DS36322 Rev. 3 - 3 17 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Application Information (continued) Off Time If the above lock detection causes a device shutdown, CLCK is used again to provide the time period, tOFF. This is the time for which the device will remain shut down after rotor lock is detected. The output shutdown period, tOFF, depends CLCK being discharged from the high threshold to the low threshold at the discharge current ILCKDL, typically 0.7µA. tOFF = CLCK (VCLCKTHH − VCLCKTHL) ILCKDL As above, the threshold voltages and discharge current are fixed, therefore the time depends only on the value of CLCK: tOFF = CLCK × 6.29 × 106 For the default value of CLCK, 0.47µF, tOFF is as follows: A note on probing CLCK Due to the very small charge and discharge currents involved with C LCK, putting an oscilloscope probe onto that node can have a significant impact on the charge time. The above graph shows simulation for the impact on soft -start t SS. A typical 10X voltage probe will have 10MΩ resistance, which is enough to increase soft -start time from 3 seconds to over 5 seconds. Probing this point can be useful in understanding the operation of the system but it is important to be aware of the impact that the scope probe will have on the operation of the circuit.

Document number: DS36322 Rev. 3 - 3 18 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Application Information (continued) Output Device Driving In order to drive the output stage efficiently, it is important to minimi ze shoot-through currents. The ZXBM1021 has a built -in delay (commutation dead-time) to allow time for re-circulating currents to be absorbed however parasitic shoot-through can still occur. This is when the rapid switch-on of the low-side MOSFET causes a low -going pulse through the high -side MOSFET to the gate, causing it to switch on momentarily. Slowing the switch-on of the low-side MOSFET can eliminate this effect. The resistors R1 to R6 and R12 in the diagram allow for control of switch-on and switch-off times for the top and bottom MOSFETs separately. High-side MOSFETs switching speed: R3 and R5 control the discharge of the gates of the high-side P-channel MOSFETs, limiting the switch-on speed. R4 and R6 control the charging of the gates of the P-channel MOSFETs, limiting the switch-off speed. Low-side MOSFETs switching speed: R1 and R2 are series gate resistors for the N-channel FETs, affecting both switch-on and switch-off times. R12 is the series resistor for the V+OP pin of the ZXBM1021. This resistor is effectively in series with R 1 or R2 when that low-side N-channel device is switched on, limiting the switch -on time. R12 allows to vary the switch-on time relative to the switch-off time to prevent parasitic shoot-through at turn-on. When using bipolar output devices, the resistors serve similar functions in limiting the base currents of the transistors. ThRef PWMSPD Ph2Hi SPD FG Ph1Lo Ph2Lo Ph1Hi SetThRef Sense SetTh GND HBIAS ZXBM1021 6 7 8 9 10 20 19 18 17 16 V+OP CLCK SMIN CSPD VCC Rsense Motor coil R5 R3 R6 R4 R1 R2 R12 D1D1 Optional, system dependent Optional System supply (12V)

Document number: DS36322 Rev. 3 - 3 19 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Application Information (continued) External Drive Transistors Diodes Incorporated offers a range of devices that are ideally suited to interface between the ZXBM1021 pre -driver and the motor. The following tables show a selection of products. For more comprehensive listings or the latest information, please refer to the Diodes Incorporated website: www.diodes.com. MOSFETs Part Number Type BVDSS (V) ID (A) RDS(ON) @ VGS = 10V (4.5V for 20V parts) (Ω) Package Power Switch: Complementary Pair MOSFETs DIODES™ DMC2020USD N P -20 7.4 -5.9 0.020

0.033 SO8

DIODES™ DMC2038LVT N P -20 4.5 -3.2 0.035

0.074 TSOT26

DIODES™ DMC3028LSD N P -30 7.1 -7.4 0.028

0.025 SO8

DIODES™ DMC4040SSD N P -40 7.5 -7.3 0.025 DIODES™ DMC4028SSD N P -40 7.2 -5.2 0.028

0.050 SO8

DIODES™ ZXMC4559DN8 N P -60 4.7 -3.9 0.055

0.085 SO8

DIODES™ ZXMC6A09DN8 N P -60 5.1 -4.8 0.045

0.055 SO8

Part Number Type BVDSS (V) ID (A) RDS(ON) @ VGS = 10V (Ω) Package Power Switch: N-Channel MOSFETs DIODES™ ZXMN10A09K N 100 7.7 0.085 TO252-3L DIODES™ ZXMN10A25K N 100 4.0 0.125 TO252-3L DIODES™ ZXMN10A11G N 100 2.4 0.35 SOT223 DIODES™ ZXMN10A08DN8 2 x N 100 2.1 0.25 SO8 DIODES™ ZXMN10B08E6 N 100 1.9 0.230 SOT23-6 DIODES™ ZXMN10A07Z N 100 1.4 0.7 SOT89 DIODES™ ZXMN6A09K N 60 11.2 0.04 TO252-3L DIODES™ ZXMN6A25K N 60 10.7 0.05 TO252-3L DIODES™ DMN6068LK3 N 60 8.5 0.068 TO252-3L DIODES™ ZXMN6A09G N 60 7.5 0.04 SOT223 DIODES™ ZXMN6A25G N 60 6.7 0.05 SOT223 DIODES™ ZXMN7A11K N 60 6.1 0.120 TO252-3L DIODES™ ZXMN6A09DN8 2 x N 60 5.6 0.04 SO8 DIODES™ DMN6068SE N 60 5.6 0.068 SOT223 DIODES™ ZXMN6A08G N 60 5.3 0.08 SOT223 DIODES™ ZXMN6A25DN8 2 x N 60 4.7 0.055 SO8 DIODES™ ZXMN6A11Z N 60 3.6 0.120 SOT89 DIODES™ ZXMN6A07Z N 60 2.2 0.250 SOT89 DIODES™ ZXMN6A07F N 60 1.4 0.250 SOT23

Document number: DS36322 Rev. 3 - 3 20 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Application Information (continued) Part Number Type BVDSS (V) ID (A) RDS(ON) @ VGS = 10V (Ω) Package Power Switch: P-Channel MOSFETs DIODES™ ZXMP10A18K P -100 -5.9 0.150 TO252 DIODES™ ZXMP10A18G P -100 -3.7 0.150 SOT223 DIODES™ ZXMP10A17E6 P -100 -1.6 0.350 SOT26 DIODES™ ZXPM6A17DN8 2 x P -60 -3.2 0.125 SO8 DIODES™ ZXMP6A18K P -60 -10.4 0.055 TO252 DIODES™ DMP4025LSD 2 x P -40 -7.6 0.025 SO8 DIODES™ DMP4015SPS P -40 -13 0.011 PowerDI5060-8 DIODES™ ZXMP4A16G P -40 -6.4 0.060 SOT223 DIODES™ DMP3008SFG P -30 -11.7 0.017 PowerDI3333-8 BJTs Part Number Type VCEO (V ) IC (A) VCE(sat) @ IC/IB (mV @ A/mA ) Package Power Switch: NPN BJTs DIODES™ FZT855 NPN 150 4 65 @ 0.5/50 SOT223 DIODES™ FMMT624 NPN 125 1 150 @ 0.5/50 SOT23 DIODES™ ZX5T853G NPN 100 6 125 @ 2/100 SOT223 DIODES™ ZXTN19100CZ NPN 100 5.25 65 @ 1/100 SOT89 DIODES™ ZXTN25100BFH NPN 100 3 135 @ 0.5/10 SOT23 DIODES™ ZXTN25100DFH NPN 100 2.5 170 @ 0.5/10 SOT23 DIODES™ FCX493 NPN 100 1 300 @ 0.5/50 SOT89 DIODES™ FCX1053A NPN 75 3 200 @ 1/10 SOT89 DIODES™ ZXTN19060CG NPN 60 7 155 @ 1/10 SOT223 DIODES™ ZX5T851G NPN 60 6 135 @ 2/50 SOT223 DIODES™ DXT2010P5 NPN 60 5 70 @ 1/10 PowerDI5 DIODES™ FCX493A NPN 60 1 500 @ 1/50 SOT89 DIODES™ FCX619 NPN 50 3 260 @ 2/50 SOT89 DIODES™ FMMT619 NPN 50 2 220 @ 2/50 SOT23 DIODES™ FCX619 NPN 50 3 260 @ 2/50 SOT89 Drive Buffer and Level Shift DIODES™ FMMT493 NPN 100 1 300 @ 0.5/50 SOT89 DIODES™ FMMT493A NPN 60 1 250 @ 0.5/50 SOT23 DIODES™ ZXTN2038F NPN 60 1 250 @ 0.5/50 SOT23 DIODES™ DSS41604 NPN 60 1 140 @ 0.5/50 SOT563

Document number: DS36322 Rev. 3 - 3 21 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Thermal Performance (1) Package Type: U-QFN4040-20 Note: 11. The power dissipation de -rating curve for ZXBM1021 in U -QFN4040-20 package is based on 2” x 2” FR4 substrate, 2oz copper, 1.6mm thick PCB with minimum recommended pad layout on the top layer with thermal vias to all copper bottom layer and the ‘junction to ambient’ th ermal resistance (RθJA) of 45°C/W. (2) Package Type: QSOP-20 Note: 12. The power dissipation de-rating curve for ZXBM1021 in QSOP-20 package is based on 2” x 2” FR4 substrate, 2oz copper, 1.6mm thick PCB all copper top layer (pad layout included) without any vias or the bottom layer copper and the ‘junct ion to ambient’ thermal resistance (RθJA) of 108°C/W. 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 -50 -25 0 25 50 75 100 125 150 Maximum Power (W) Ambient Operating Temperature (oC) U-QFN4040-20 Derating Curve RθJA = 45°C/W 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 -50 -25 0 25 50 75 100 125 150 Maximum Power (W) Ambient Operating Temperature (oC) QSOP-20 Derating Curve RθJA = 108°C/W

Document number: DS36322 Rev. 3 - 3 22 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021

Ordering Information

TC : Tape & Reel JB20 : U-QFN4040-20 Q20 : QSOP-20 Part Number Part Number Suffix Package Code Package Packing Qty. Carrier ZXBM1021JB20TC TC JB20 U-QFN4040-20 3000 Tape & Reel ZXBM1021Q20TC TC Q20 QSOP-20 2500 Tape & Reel Marking Information (1) Package Type: U-QFN4040-20 ( Top View ) 1021 YY : Year (ex: 22 = 2022) WW : Week: Week 01 to 52;

52 Represents Week 52 and 53YY WW

Part Number Package Identification Code ZXBM1021JB20TC U-QFN4040-20 ZXBM 1021 (2) Package Type: QSOP-20 WW : Week: Week 01 to 52; (Top View) YY : Year (ex: 22 = 2022)

52 Represents Week 52 and 53

Part Number Package Identification Code ZXBM1021Q20TC QSOP-20 ZXBM1021

Document number: DS36322 Rev. 3 - 3 23 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Package Outline Dimensions Please see http://www.diodes.com/package-outlines.html for the latest version. U-QFN4040-20 QSOP-20 U-QFN4040-20 Dim Min Max Typ A 0.55 0.65 0.60 A1 0 0.05 0.02 A3 - - 0.15 b 0.20 0.30 0.25 D 3.95 4.05 4.00 D2 2.40 2.60 2.50 E 3.95 4.05 4.00 E2 2.40 2.60 2.50 e 0.50 BSC L 0.35 0.45 0.40 Z - - 0.875 All Dimensions in mm QSOP-20 Dim Min Max Typ A 1.55 1.73 - A1 0.10 0.25 - A2 1.40 1.50 - b 0.20 0.30 - c 0.18 0.25 - D 8.56 8.74 - E 5.79 6.20 - E1 3.81 3.99 - e 0.635 BSC h 0.254 0.508 - L 0.41 1.27 - L1 1.03 REF L2 0.254 BSC R 0.0762 - - R1 0.0762 - - ZD 1.47 REF θ 0° 8° - θ1 5° 15° - θ2 0° - - All Dimensions in mm D E b L A (Pin #1 ID) Seating Plane Z (8x) e D E1 E ZD E/2 E1/2 e b 20x PIN 1 A2A SEE DETAIL 'A' L GAUGE PLANE SEATING PLANE h h R c

Document number: DS36322 Rev. 3 - 3 24 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. U-QFN4040-20 QSOP-20 Dimensions Value (in mm) C 0.500 X 0.350 X1 0.600 X2 2.500 X3 4.300 Y 0.600 Y1 0.350 Y2 2.500 Y3 4.300 Dimensions Value (in mm) C 0.635 X 0.350 X1 6.065 Y 1.450 Y1 6.400 Y1(10x) X1(10x) X(10x) C Y(10x) Y 20x C X 20x

Document number: DS36322 Rev. 3 - 3 25 of 25 www.diodes.com August 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. ZXBM1021 IMPORTANT NOTICE 1. DIODES INCORPORATED (Diodes) AND ITS SUBSIDIARIES MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON -INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. The Information contained herein is for informational purpose only and is provided only to il lustrate the operation of Diodes’ products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and tec hnically trained engineering customers and users who design with Diodes’ products. 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